diff --git a/deps/acorn-plugins/acorn-bigint/CHANGELOG.md b/deps/acorn-plugins/acorn-bigint/CHANGELOG.md
deleted file mode 100644
index 1d12d708f2cb75..00000000000000
--- a/deps/acorn-plugins/acorn-bigint/CHANGELOG.md
+++ /dev/null
@@ -1,21 +0,0 @@
-## 0.4.0 (2019-04-04)
-
-* Make compatible with acorn-numeric-separator
-
-## 0.3.1 (2018-10-06)
-
-* Fix creation of BigInt values everywhere (Thanks, Gus Caplan!)
-
-## 0.3.0 (2018-09-14)
-
-* Update to new acorn 6 interface
-* Actually support creating BigInt values in AST in Chrome
-* Change license to MIT
-
-## 0.2.0 (2017-12-20)
-
-* Emit BigInt values in AST if supported by runtime engine
-
-## 0.1.0 (2017-12-19)
-
-Initial release
diff --git a/deps/acorn-plugins/acorn-bigint/LICENSE b/deps/acorn-plugins/acorn-bigint/LICENSE
deleted file mode 100644
index 7c2b27a19c033c..00000000000000
--- a/deps/acorn-plugins/acorn-bigint/LICENSE
+++ /dev/null
@@ -1,19 +0,0 @@
-Copyright (C) 2017-2018 by Adrian Heine
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
diff --git a/deps/acorn-plugins/acorn-bigint/README.md b/deps/acorn-plugins/acorn-bigint/README.md
deleted file mode 100644
index b0b6bb55543a58..00000000000000
--- a/deps/acorn-plugins/acorn-bigint/README.md
+++ /dev/null
@@ -1,21 +0,0 @@
-# BigInt support for Acorn
-
-[![NPM version](https://img.shields.io/npm/v/acorn-bigint.svg)](https://www.npmjs.org/package/acorn-bigint)
-
-This is a plugin for [Acorn](http://marijnhaverbeke.nl/acorn/) - a tiny, fast JavaScript parser, written completely in JavaScript.
-
-It implements support for arbitrary precision integers as defined in the stage 3 proposal [BigInt: Arbitrary precision integers in JavaScript](https://github.com/tc39/proposal-bigint). The emitted AST follows [an ESTree proposal](https://github.com/estree/estree/blob/132be9b9ec376adbc082dd5f6ba78aefd7a1a864/experimental/bigint.md).
-
-## Usage
-
-This module provides a plugin that can be used to extend the Acorn `Parser` class:
-
-```javascript
-const {Parser} = require('acorn');
-const bigInt = require('acorn-bigint');
-Parser.extend(bigInt).parse('100n');
-```
-
-## License
-
-This plugin is released under an [MIT License](./LICENSE).
diff --git a/deps/acorn-plugins/acorn-bigint/index.js b/deps/acorn-plugins/acorn-bigint/index.js
deleted file mode 100644
index 8e63515e11bbc5..00000000000000
--- a/deps/acorn-plugins/acorn-bigint/index.js
+++ /dev/null
@@ -1,59 +0,0 @@
-"use strict"
-
-const acorn = require('internal/deps/acorn/acorn/dist/acorn')
-const tt = acorn.tokTypes
-const isIdentifierStart = acorn.isIdentifierStart
-
-module.exports = function(Parser) {
-  return class extends Parser {
-    parseLiteral(value) {
-      const node = super.parseLiteral(value)
-      if (node.raw.charCodeAt(node.raw.length - 1) == 110) node.bigint = this.getNumberInput(node.start, node.end)
-      return node
-    }
-
-    readRadixNumber(radix) {
-      let start = this.pos
-      this.pos += 2 // 0x
-      let val = this.readInt(radix)
-      if (val === null) this.raise(this.start + 2, `Expected number in radix ${radix}`)
-      if (this.input.charCodeAt(this.pos) == 110) {
-        let str = this.getNumberInput(start, this.pos)
-        val = typeof BigInt !== "undefined" ? BigInt(str) : null
-        ++this.pos
-      } else if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number")
-      return this.finishToken(tt.num, val)
-    }
-
-    readNumber(startsWithDot) {
-      let start = this.pos
-
-      // Not an int
-      if (startsWithDot) return super.readNumber(startsWithDot)
-
-      // Legacy octal
-      if (this.input.charCodeAt(start) === 48 && this.input.charCodeAt(start + 1) !== 110) {
-        return super.readNumber(startsWithDot)
-      }
-
-      if (this.readInt(10) === null) this.raise(start, "Invalid number")
-
-      // Not a BigInt, reset and parse again
-      if (this.input.charCodeAt(this.pos) != 110) {
-        this.pos = start
-        return super.readNumber(startsWithDot)
-      }
-
-      let str = this.getNumberInput(start, this.pos)
-      let val = typeof BigInt !== "undefined" ? BigInt(str) : null
-      ++this.pos
-      return this.finishToken(tt.num, val)
-    }
-
-    // This is basically a hook for acorn-numeric-separator
-    getNumberInput(start, end) {
-      if (super.getNumberInput) return super.getNumberInput(start, end)
-      return this.input.slice(start, end)
-    }
-  }
-}
diff --git a/deps/acorn-plugins/acorn-bigint/package.json b/deps/acorn-plugins/acorn-bigint/package.json
deleted file mode 100644
index 073cdfb86c309d..00000000000000
--- a/deps/acorn-plugins/acorn-bigint/package.json
+++ /dev/null
@@ -1,65 +0,0 @@
-{
-  "_from": "acorn-bigint",
-  "_id": "acorn-bigint@0.4.0",
-  "_inBundle": false,
-  "_integrity": "sha512-W9iaqWzqFo7ZBLmI9dMjHYGrN0Nm/ZgToqhvd3RELJux7RsX6k1/80h+bD9TtTpeKky/kYNbr3+vHWqI3hdyfA==",
-  "_location": "/acorn-bigint",
-  "_phantomChildren": {},
-  "_requested": {
-    "type": "tag",
-    "registry": true,
-    "raw": "acorn-bigint",
-    "name": "acorn-bigint",
-    "escapedName": "acorn-bigint",
-    "rawSpec": "",
-    "saveSpec": null,
-    "fetchSpec": "latest"
-  },
-  "_requiredBy": [
-    "#USER",
-    "/"
-  ],
-  "_resolved": "https://registry.npmjs.org/acorn-bigint/-/acorn-bigint-0.4.0.tgz",
-  "_shasum": "af3245ed8a7c3747387fca4680ae1960f617c4cd",
-  "_spec": "acorn-bigint",
-  "_where": "/home/ruben/repos/node/node",
-  "bugs": {
-    "url": "https://github.com/acornjs/acorn-bigint/issues"
-  },
-  "bundleDependencies": false,
-  "contributors": [
-    {
-      "name": "Adrian Heine",
-      "email": "mail@adrianheine.de"
-    }
-  ],
-  "deprecated": false,
-  "description": "Support for BigInt in acorn",
-  "devDependencies": {
-    "acorn": "^6.1.1",
-    "eslint": "^5.16.0",
-    "eslint-plugin-node": "^8.0.1",
-    "mocha": "^6.0.2",
-    "test262": "git+https://github.com/tc39/test262.git#611919174ffe060503691a0c7e3eb2a65b646124",
-    "test262-parser-runner": "^0.5.0"
-  },
-  "engines": {
-    "node": ">=4.8.2"
-  },
-  "homepage": "https://github.com/acornjs/acorn-bigint",
-  "license": "MIT",
-  "name": "acorn-bigint",
-  "peerDependencies": {
-    "acorn": "^6.0.0"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/acornjs/acorn-bigint.git"
-  },
-  "scripts": {
-    "lint": "eslint -c .eslintrc.json .",
-    "test": "mocha",
-    "test:test262": "node run_test262.js"
-  },
-  "version": "0.4.0"
-}
diff --git a/deps/acorn/acorn-walk/CHANGELOG.md b/deps/acorn/acorn-walk/CHANGELOG.md
index 525950b5183bcf..c02dbd7dda8417 100644
--- a/deps/acorn/acorn-walk/CHANGELOG.md
+++ b/deps/acorn/acorn-walk/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 6.2.0 (2017-07-04)
+
+### New features
+
+Add support for `Import` nodes.
+
 ## 6.1.0 (2018-09-28)
 
 ### New features
diff --git a/deps/acorn/acorn-walk/README.md b/deps/acorn/acorn-walk/README.md
index 2b94bec31eccfb..e192baced005ac 100644
--- a/deps/acorn/acorn-walk/README.md
+++ b/deps/acorn/acorn-walk/README.md
@@ -6,7 +6,7 @@ An abstract syntax tree walker for the
 ## Community
 
 Acorn is open source software released under an
-[MIT license](https://github.com/acornjs/acorn/blob/master/LICENSE).
+[MIT license](https://github.com/acornjs/acorn/blob/master/acorn-walk/LICENSE).
 
 You are welcome to
 [report bugs](https://github.com/acornjs/acorn/issues) or create pull
diff --git a/deps/acorn/acorn-walk/dist/walk.js b/deps/acorn/acorn-walk/dist/walk.js
index 322a58d9fabcb3..398a0032f4bb65 100644
--- a/deps/acorn/acorn-walk/dist/walk.js
+++ b/deps/acorn/acorn-walk/dist/walk.js
@@ -1,456 +1,458 @@
 (function (global, factory) {
-	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
-	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory((global.acorn = global.acorn || {}, global.acorn.walk = {})));
-}(this, (function (exports) { 'use strict';
-
-// AST walker module for Mozilla Parser API compatible trees
-
-// A simple walk is one where you simply specify callbacks to be
-// called on specific nodes. The last two arguments are optional. A
-// simple use would be
-//
-//     walk.simple(myTree, {
-//         Expression: function(node) { ... }
-//     });
-//
-// to do something with all expressions. All Parser API node types
-// can be used to identify node types, as well as Expression and
-// Statement, which denote categories of nodes.
-//
-// The base argument can be used to pass a custom (recursive)
-// walker, and state can be used to give this walked an initial
-// state.
-
-function simple(node, visitors, baseVisitor, state, override) {
-  if (!baseVisitor) { baseVisitor = base
-  ; }(function c(node, st, override) {
-    var type = override || node.type, found = visitors[type];
-    baseVisitor[type](node, st, c);
-    if (found) { found(node, st); }
-  })(node, state, override);
-}
-
-// An ancestor walk keeps an array of ancestor nodes (including the
-// current node) and passes them to the callback as third parameter
-// (and also as state parameter when no other state is present).
-function ancestor(node, visitors, baseVisitor, state) {
-  var ancestors = [];
-  if (!baseVisitor) { baseVisitor = base
-  ; }(function c(node, st, override) {
-    var type = override || node.type, found = visitors[type];
-    var isNew = node !== ancestors[ancestors.length - 1];
-    if (isNew) { ancestors.push(node); }
-    baseVisitor[type](node, st, c);
-    if (found) { found(node, st || ancestors, ancestors); }
-    if (isNew) { ancestors.pop(); }
-  })(node, state);
-}
-
-// A recursive walk is one where your functions override the default
-// walkers. They can modify and replace the state parameter that's
-// threaded through the walk, and can opt how and whether to walk
-// their child nodes (by calling their third argument on these
-// nodes).
-function recursive(node, state, funcs, baseVisitor, override) {
-  var visitor = funcs ? make(funcs, baseVisitor || undefined) : baseVisitor;(function c(node, st, override) {
-    visitor[override || node.type](node, st, c);
-  })(node, state, override);
-}
-
-function makeTest(test) {
-  if (typeof test === "string")
-    { return function (type) { return type === test; } }
-  else if (!test)
-    { return function () { return true; } }
-  else
-    { return test }
-}
-
-var Found = function Found(node, state) { this.node = node; this.state = state; };
-
-// A full walk triggers the callback on each node
-function full(node, callback, baseVisitor, state, override) {
-  if (!baseVisitor) { baseVisitor = base
-  ; }(function c(node, st, override) {
-    var type = override || node.type;
-    baseVisitor[type](node, st, c);
-    if (!override) { callback(node, st, type); }
-  })(node, state, override);
-}
-
-// An fullAncestor walk is like an ancestor walk, but triggers
-// the callback on each node
-function fullAncestor(node, callback, baseVisitor, state) {
-  if (!baseVisitor) { baseVisitor = base; }
-  var ancestors = [];(function c(node, st, override) {
-    var type = override || node.type;
-    var isNew = node !== ancestors[ancestors.length - 1];
-    if (isNew) { ancestors.push(node); }
-    baseVisitor[type](node, st, c);
-    if (!override) { callback(node, st || ancestors, ancestors, type); }
-    if (isNew) { ancestors.pop(); }
-  })(node, state);
-}
-
-// Find a node with a given start, end, and type (all are optional,
-// null can be used as wildcard). Returns a {node, state} object, or
-// undefined when it doesn't find a matching node.
-function findNodeAt(node, start, end, test, baseVisitor, state) {
-  if (!baseVisitor) { baseVisitor = base; }
-  test = makeTest(test);
-  try {
-    (function c(node, st, override) {
-      var type = override || node.type;
-      if ((start == null || node.start <= start) &&
-          (end == null || node.end >= end))
-        { baseVisitor[type](node, st, c); }
-      if ((start == null || node.start === start) &&
-          (end == null || node.end === end) &&
-          test(type, node))
-        { throw new Found(node, st) }
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (global = global || self, factory((global.acorn = global.acorn || {}, global.acorn.walk = {})));
+}(this, function (exports) { 'use strict';
+
+  // AST walker module for Mozilla Parser API compatible trees
+
+  // A simple walk is one where you simply specify callbacks to be
+  // called on specific nodes. The last two arguments are optional. A
+  // simple use would be
+  //
+  //     walk.simple(myTree, {
+  //         Expression: function(node) { ... }
+  //     });
+  //
+  // to do something with all expressions. All Parser API node types
+  // can be used to identify node types, as well as Expression and
+  // Statement, which denote categories of nodes.
+  //
+  // The base argument can be used to pass a custom (recursive)
+  // walker, and state can be used to give this walked an initial
+  // state.
+
+  function simple(node, visitors, baseVisitor, state, override) {
+    if (!baseVisitor) { baseVisitor = base
+    ; }(function c(node, st, override) {
+      var type = override || node.type, found = visitors[type];
+      baseVisitor[type](node, st, c);
+      if (found) { found(node, st); }
+    })(node, state, override);
+  }
+
+  // An ancestor walk keeps an array of ancestor nodes (including the
+  // current node) and passes them to the callback as third parameter
+  // (and also as state parameter when no other state is present).
+  function ancestor(node, visitors, baseVisitor, state) {
+    var ancestors = [];
+    if (!baseVisitor) { baseVisitor = base
+    ; }(function c(node, st, override) {
+      var type = override || node.type, found = visitors[type];
+      var isNew = node !== ancestors[ancestors.length - 1];
+      if (isNew) { ancestors.push(node); }
+      baseVisitor[type](node, st, c);
+      if (found) { found(node, st || ancestors, ancestors); }
+      if (isNew) { ancestors.pop(); }
     })(node, state);
-  } catch (e) {
-    if (e instanceof Found) { return e }
-    throw e
   }
-}
-
-// Find the innermost node of a given type that contains the given
-// position. Interface similar to findNodeAt.
-function findNodeAround(node, pos, test, baseVisitor, state) {
-  test = makeTest(test);
-  if (!baseVisitor) { baseVisitor = base; }
-  try {
-    (function c(node, st, override) {
+
+  // A recursive walk is one where your functions override the default
+  // walkers. They can modify and replace the state parameter that's
+  // threaded through the walk, and can opt how and whether to walk
+  // their child nodes (by calling their third argument on these
+  // nodes).
+  function recursive(node, state, funcs, baseVisitor, override) {
+    var visitor = funcs ? make(funcs, baseVisitor || undefined) : baseVisitor
+    ;(function c(node, st, override) {
+      visitor[override || node.type](node, st, c);
+    })(node, state, override);
+  }
+
+  function makeTest(test) {
+    if (typeof test === "string")
+      { return function (type) { return type === test; } }
+    else if (!test)
+      { return function () { return true; } }
+    else
+      { return test }
+  }
+
+  var Found = function Found(node, state) { this.node = node; this.state = state; };
+
+  // A full walk triggers the callback on each node
+  function full(node, callback, baseVisitor, state, override) {
+    if (!baseVisitor) { baseVisitor = base
+    ; }(function c(node, st, override) {
       var type = override || node.type;
-      if (node.start > pos || node.end < pos) { return }
       baseVisitor[type](node, st, c);
-      if (test(type, node)) { throw new Found(node, st) }
-    })(node, state);
-  } catch (e) {
-    if (e instanceof Found) { return e }
-    throw e
+      if (!override) { callback(node, st, type); }
+    })(node, state, override);
   }
-}
-
-// Find the outermost matching node after a given position.
-function findNodeAfter(node, pos, test, baseVisitor, state) {
-  test = makeTest(test);
-  if (!baseVisitor) { baseVisitor = base; }
-  try {
-    (function c(node, st, override) {
-      if (node.end < pos) { return }
+
+  // An fullAncestor walk is like an ancestor walk, but triggers
+  // the callback on each node
+  function fullAncestor(node, callback, baseVisitor, state) {
+    if (!baseVisitor) { baseVisitor = base; }
+    var ancestors = []
+    ;(function c(node, st, override) {
       var type = override || node.type;
-      if (node.start >= pos && test(type, node)) { throw new Found(node, st) }
+      var isNew = node !== ancestors[ancestors.length - 1];
+      if (isNew) { ancestors.push(node); }
       baseVisitor[type](node, st, c);
+      if (!override) { callback(node, st || ancestors, ancestors, type); }
+      if (isNew) { ancestors.pop(); }
     })(node, state);
-  } catch (e) {
-    if (e instanceof Found) { return e }
-    throw e
   }
-}
-
-// Find the outermost matching node before a given position.
-function findNodeBefore(node, pos, test, baseVisitor, state) {
-  test = makeTest(test);
-  if (!baseVisitor) { baseVisitor = base; }
-  var max;(function c(node, st, override) {
-    if (node.start > pos) { return }
-    var type = override || node.type;
-    if (node.end <= pos && (!max || max.node.end < node.end) && test(type, node))
-      { max = new Found(node, st); }
-    baseVisitor[type](node, st, c);
-  })(node, state);
-  return max
-}
-
-// Fallback to an Object.create polyfill for older environments.
-var create = Object.create || function(proto) {
-  function Ctor() {}
-  Ctor.prototype = proto;
-  return new Ctor
-};
-
-// Used to create a custom walker. Will fill in all missing node
-// type properties with the defaults.
-function make(funcs, baseVisitor) {
-  var visitor = create(baseVisitor || base);
-  for (var type in funcs) { visitor[type] = funcs[type]; }
-  return visitor
-}
-
-function skipThrough(node, st, c) { c(node, st); }
-function ignore(_node, _st, _c) {}
-
-// Node walkers.
-
-var base = {};
-
-base.Program = base.BlockStatement = function (node, st, c) {
-  for (var i = 0, list = node.body; i < list.length; i += 1)
-    {
-    var stmt = list[i];
-
-    c(stmt, st, "Statement");
-  }
-};
-base.Statement = skipThrough;
-base.EmptyStatement = ignore;
-base.ExpressionStatement = base.ParenthesizedExpression =
-  function (node, st, c) { return c(node.expression, st, "Expression"); };
-base.IfStatement = function (node, st, c) {
-  c(node.test, st, "Expression");
-  c(node.consequent, st, "Statement");
-  if (node.alternate) { c(node.alternate, st, "Statement"); }
-};
-base.LabeledStatement = function (node, st, c) { return c(node.body, st, "Statement"); };
-base.BreakStatement = base.ContinueStatement = ignore;
-base.WithStatement = function (node, st, c) {
-  c(node.object, st, "Expression");
-  c(node.body, st, "Statement");
-};
-base.SwitchStatement = function (node, st, c) {
-  c(node.discriminant, st, "Expression");
-  for (var i = 0, list = node.cases; i < list.length; i += 1) {
-    var cs = list[i];
-
-    if (cs.test) { c(cs.test, st, "Expression"); }
-    for (var i$1 = 0, list$1 = cs.consequent; i$1 < list$1.length; i$1 += 1)
-      {
-      var cons = list$1[i$1];
 
-      c(cons, st, "Statement");
+  // Find a node with a given start, end, and type (all are optional,
+  // null can be used as wildcard). Returns a {node, state} object, or
+  // undefined when it doesn't find a matching node.
+  function findNodeAt(node, start, end, test, baseVisitor, state) {
+    if (!baseVisitor) { baseVisitor = base; }
+    test = makeTest(test);
+    try {
+      (function c(node, st, override) {
+        var type = override || node.type;
+        if ((start == null || node.start <= start) &&
+            (end == null || node.end >= end))
+          { baseVisitor[type](node, st, c); }
+        if ((start == null || node.start === start) &&
+            (end == null || node.end === end) &&
+            test(type, node))
+          { throw new Found(node, st) }
+      })(node, state);
+    } catch (e) {
+      if (e instanceof Found) { return e }
+      throw e
     }
   }
-};
-base.SwitchCase = function (node, st, c) {
-  if (node.test) { c(node.test, st, "Expression"); }
-  for (var i = 0, list = node.consequent; i < list.length; i += 1)
-    {
-    var cons = list[i];
-
-    c(cons, st, "Statement");
+
+  // Find the innermost node of a given type that contains the given
+  // position. Interface similar to findNodeAt.
+  function findNodeAround(node, pos, test, baseVisitor, state) {
+    test = makeTest(test);
+    if (!baseVisitor) { baseVisitor = base; }
+    try {
+      (function c(node, st, override) {
+        var type = override || node.type;
+        if (node.start > pos || node.end < pos) { return }
+        baseVisitor[type](node, st, c);
+        if (test(type, node)) { throw new Found(node, st) }
+      })(node, state);
+    } catch (e) {
+      if (e instanceof Found) { return e }
+      throw e
+    }
   }
-};
-base.ReturnStatement = base.YieldExpression = base.AwaitExpression = function (node, st, c) {
-  if (node.argument) { c(node.argument, st, "Expression"); }
-};
-base.ThrowStatement = base.SpreadElement =
-  function (node, st, c) { return c(node.argument, st, "Expression"); };
-base.TryStatement = function (node, st, c) {
-  c(node.block, st, "Statement");
-  if (node.handler) { c(node.handler, st); }
-  if (node.finalizer) { c(node.finalizer, st, "Statement"); }
-};
-base.CatchClause = function (node, st, c) {
-  if (node.param) { c(node.param, st, "Pattern"); }
-  c(node.body, st, "Statement");
-};
-base.WhileStatement = base.DoWhileStatement = function (node, st, c) {
-  c(node.test, st, "Expression");
-  c(node.body, st, "Statement");
-};
-base.ForStatement = function (node, st, c) {
-  if (node.init) { c(node.init, st, "ForInit"); }
-  if (node.test) { c(node.test, st, "Expression"); }
-  if (node.update) { c(node.update, st, "Expression"); }
-  c(node.body, st, "Statement");
-};
-base.ForInStatement = base.ForOfStatement = function (node, st, c) {
-  c(node.left, st, "ForInit");
-  c(node.right, st, "Expression");
-  c(node.body, st, "Statement");
-};
-base.ForInit = function (node, st, c) {
-  if (node.type === "VariableDeclaration") { c(node, st); }
-  else { c(node, st, "Expression"); }
-};
-base.DebuggerStatement = ignore;
-
-base.FunctionDeclaration = function (node, st, c) { return c(node, st, "Function"); };
-base.VariableDeclaration = function (node, st, c) {
-  for (var i = 0, list = node.declarations; i < list.length; i += 1)
-    {
-    var decl = list[i];
-
-    c(decl, st);
+
+  // Find the outermost matching node after a given position.
+  function findNodeAfter(node, pos, test, baseVisitor, state) {
+    test = makeTest(test);
+    if (!baseVisitor) { baseVisitor = base; }
+    try {
+      (function c(node, st, override) {
+        if (node.end < pos) { return }
+        var type = override || node.type;
+        if (node.start >= pos && test(type, node)) { throw new Found(node, st) }
+        baseVisitor[type](node, st, c);
+      })(node, state);
+    } catch (e) {
+      if (e instanceof Found) { return e }
+      throw e
+    }
   }
-};
-base.VariableDeclarator = function (node, st, c) {
-  c(node.id, st, "Pattern");
-  if (node.init) { c(node.init, st, "Expression"); }
-};
-
-base.Function = function (node, st, c) {
-  if (node.id) { c(node.id, st, "Pattern"); }
-  for (var i = 0, list = node.params; i < list.length; i += 1)
-    {
-    var param = list[i];
-
-    c(param, st, "Pattern");
+
+  // Find the outermost matching node before a given position.
+  function findNodeBefore(node, pos, test, baseVisitor, state) {
+    test = makeTest(test);
+    if (!baseVisitor) { baseVisitor = base; }
+    var max
+    ;(function c(node, st, override) {
+      if (node.start > pos) { return }
+      var type = override || node.type;
+      if (node.end <= pos && (!max || max.node.end < node.end) && test(type, node))
+        { max = new Found(node, st); }
+      baseVisitor[type](node, st, c);
+    })(node, state);
+    return max
   }
-  c(node.body, st, node.expression ? "Expression" : "Statement");
-};
-
-base.Pattern = function (node, st, c) {
-  if (node.type === "Identifier")
-    { c(node, st, "VariablePattern"); }
-  else if (node.type === "MemberExpression")
-    { c(node, st, "MemberPattern"); }
-  else
-    { c(node, st); }
-};
-base.VariablePattern = ignore;
-base.MemberPattern = skipThrough;
-base.RestElement = function (node, st, c) { return c(node.argument, st, "Pattern"); };
-base.ArrayPattern = function (node, st, c) {
-  for (var i = 0, list = node.elements; i < list.length; i += 1) {
-    var elt = list[i];
-
-    if (elt) { c(elt, st, "Pattern"); }
+
+  // Fallback to an Object.create polyfill for older environments.
+  var create = Object.create || function(proto) {
+    function Ctor() {}
+    Ctor.prototype = proto;
+    return new Ctor
+  };
+
+  // Used to create a custom walker. Will fill in all missing node
+  // type properties with the defaults.
+  function make(funcs, baseVisitor) {
+    var visitor = create(baseVisitor || base);
+    for (var type in funcs) { visitor[type] = funcs[type]; }
+    return visitor
   }
-};
-base.ObjectPattern = function (node, st, c) {
-  for (var i = 0, list = node.properties; i < list.length; i += 1) {
-    var prop = list[i];
-
-    if (prop.type === "Property") {
-      if (prop.computed) { c(prop.key, st, "Expression"); }
-      c(prop.value, st, "Pattern");
-    } else if (prop.type === "RestElement") {
-      c(prop.argument, st, "Pattern");
+
+  function skipThrough(node, st, c) { c(node, st); }
+  function ignore(_node, _st, _c) {}
+
+  // Node walkers.
+
+  var base = {};
+
+  base.Program = base.BlockStatement = function (node, st, c) {
+    for (var i = 0, list = node.body; i < list.length; i += 1)
+      {
+      var stmt = list[i];
+
+      c(stmt, st, "Statement");
     }
-  }
-};
+  };
+  base.Statement = skipThrough;
+  base.EmptyStatement = ignore;
+  base.ExpressionStatement = base.ParenthesizedExpression =
+    function (node, st, c) { return c(node.expression, st, "Expression"); };
+  base.IfStatement = function (node, st, c) {
+    c(node.test, st, "Expression");
+    c(node.consequent, st, "Statement");
+    if (node.alternate) { c(node.alternate, st, "Statement"); }
+  };
+  base.LabeledStatement = function (node, st, c) { return c(node.body, st, "Statement"); };
+  base.BreakStatement = base.ContinueStatement = ignore;
+  base.WithStatement = function (node, st, c) {
+    c(node.object, st, "Expression");
+    c(node.body, st, "Statement");
+  };
+  base.SwitchStatement = function (node, st, c) {
+    c(node.discriminant, st, "Expression");
+    for (var i$1 = 0, list$1 = node.cases; i$1 < list$1.length; i$1 += 1) {
+      var cs = list$1[i$1];
+
+      if (cs.test) { c(cs.test, st, "Expression"); }
+      for (var i = 0, list = cs.consequent; i < list.length; i += 1)
+        {
+        var cons = list[i];
+
+        c(cons, st, "Statement");
+      }
+    }
+  };
+  base.SwitchCase = function (node, st, c) {
+    if (node.test) { c(node.test, st, "Expression"); }
+    for (var i = 0, list = node.consequent; i < list.length; i += 1)
+      {
+      var cons = list[i];
 
-base.Expression = skipThrough;
-base.ThisExpression = base.Super = base.MetaProperty = ignore;
-base.ArrayExpression = function (node, st, c) {
-  for (var i = 0, list = node.elements; i < list.length; i += 1) {
-    var elt = list[i];
+      c(cons, st, "Statement");
+    }
+  };
+  base.ReturnStatement = base.YieldExpression = base.AwaitExpression = function (node, st, c) {
+    if (node.argument) { c(node.argument, st, "Expression"); }
+  };
+  base.ThrowStatement = base.SpreadElement =
+    function (node, st, c) { return c(node.argument, st, "Expression"); };
+  base.TryStatement = function (node, st, c) {
+    c(node.block, st, "Statement");
+    if (node.handler) { c(node.handler, st); }
+    if (node.finalizer) { c(node.finalizer, st, "Statement"); }
+  };
+  base.CatchClause = function (node, st, c) {
+    if (node.param) { c(node.param, st, "Pattern"); }
+    c(node.body, st, "Statement");
+  };
+  base.WhileStatement = base.DoWhileStatement = function (node, st, c) {
+    c(node.test, st, "Expression");
+    c(node.body, st, "Statement");
+  };
+  base.ForStatement = function (node, st, c) {
+    if (node.init) { c(node.init, st, "ForInit"); }
+    if (node.test) { c(node.test, st, "Expression"); }
+    if (node.update) { c(node.update, st, "Expression"); }
+    c(node.body, st, "Statement");
+  };
+  base.ForInStatement = base.ForOfStatement = function (node, st, c) {
+    c(node.left, st, "ForInit");
+    c(node.right, st, "Expression");
+    c(node.body, st, "Statement");
+  };
+  base.ForInit = function (node, st, c) {
+    if (node.type === "VariableDeclaration") { c(node, st); }
+    else { c(node, st, "Expression"); }
+  };
+  base.DebuggerStatement = ignore;
+
+  base.FunctionDeclaration = function (node, st, c) { return c(node, st, "Function"); };
+  base.VariableDeclaration = function (node, st, c) {
+    for (var i = 0, list = node.declarations; i < list.length; i += 1)
+      {
+      var decl = list[i];
 
-    if (elt) { c(elt, st, "Expression"); }
-  }
-};
-base.ObjectExpression = function (node, st, c) {
-  for (var i = 0, list = node.properties; i < list.length; i += 1)
-    {
-    var prop = list[i];
+      c(decl, st);
+    }
+  };
+  base.VariableDeclarator = function (node, st, c) {
+    c(node.id, st, "Pattern");
+    if (node.init) { c(node.init, st, "Expression"); }
+  };
+
+  base.Function = function (node, st, c) {
+    if (node.id) { c(node.id, st, "Pattern"); }
+    for (var i = 0, list = node.params; i < list.length; i += 1)
+      {
+      var param = list[i];
 
-    c(prop, st);
-  }
-};
-base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
-base.SequenceExpression = function (node, st, c) {
-  for (var i = 0, list = node.expressions; i < list.length; i += 1)
-    {
-    var expr = list[i];
-
-    c(expr, st, "Expression");
-  }
-};
-base.TemplateLiteral = function (node, st, c) {
-  for (var i = 0, list = node.quasis; i < list.length; i += 1)
-    {
-    var quasi = list[i];
+      c(param, st, "Pattern");
+    }
+    c(node.body, st, node.expression ? "Expression" : "Statement");
+  };
+
+  base.Pattern = function (node, st, c) {
+    if (node.type === "Identifier")
+      { c(node, st, "VariablePattern"); }
+    else if (node.type === "MemberExpression")
+      { c(node, st, "MemberPattern"); }
+    else
+      { c(node, st); }
+  };
+  base.VariablePattern = ignore;
+  base.MemberPattern = skipThrough;
+  base.RestElement = function (node, st, c) { return c(node.argument, st, "Pattern"); };
+  base.ArrayPattern = function (node, st, c) {
+    for (var i = 0, list = node.elements; i < list.length; i += 1) {
+      var elt = list[i];
+
+      if (elt) { c(elt, st, "Pattern"); }
+    }
+  };
+  base.ObjectPattern = function (node, st, c) {
+    for (var i = 0, list = node.properties; i < list.length; i += 1) {
+      var prop = list[i];
+
+      if (prop.type === "Property") {
+        if (prop.computed) { c(prop.key, st, "Expression"); }
+        c(prop.value, st, "Pattern");
+      } else if (prop.type === "RestElement") {
+        c(prop.argument, st, "Pattern");
+      }
+    }
+  };
 
-    c(quasi, st);
-  }
+  base.Expression = skipThrough;
+  base.ThisExpression = base.Super = base.MetaProperty = ignore;
+  base.ArrayExpression = function (node, st, c) {
+    for (var i = 0, list = node.elements; i < list.length; i += 1) {
+      var elt = list[i];
 
-  for (var i$1 = 0, list$1 = node.expressions; i$1 < list$1.length; i$1 += 1)
-    {
-    var expr = list$1[i$1];
+      if (elt) { c(elt, st, "Expression"); }
+    }
+  };
+  base.ObjectExpression = function (node, st, c) {
+    for (var i = 0, list = node.properties; i < list.length; i += 1)
+      {
+      var prop = list[i];
 
-    c(expr, st, "Expression");
-  }
-};
-base.TemplateElement = ignore;
-base.UnaryExpression = base.UpdateExpression = function (node, st, c) {
-  c(node.argument, st, "Expression");
-};
-base.BinaryExpression = base.LogicalExpression = function (node, st, c) {
-  c(node.left, st, "Expression");
-  c(node.right, st, "Expression");
-};
-base.AssignmentExpression = base.AssignmentPattern = function (node, st, c) {
-  c(node.left, st, "Pattern");
-  c(node.right, st, "Expression");
-};
-base.ConditionalExpression = function (node, st, c) {
-  c(node.test, st, "Expression");
-  c(node.consequent, st, "Expression");
-  c(node.alternate, st, "Expression");
-};
-base.NewExpression = base.CallExpression = function (node, st, c) {
-  c(node.callee, st, "Expression");
-  if (node.arguments)
-    { for (var i = 0, list = node.arguments; i < list.length; i += 1)
+      c(prop, st);
+    }
+  };
+  base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
+  base.SequenceExpression = function (node, st, c) {
+    for (var i = 0, list = node.expressions; i < list.length; i += 1)
       {
-        var arg = list[i];
-
-        c(arg, st, "Expression");
-      } }
-};
-base.MemberExpression = function (node, st, c) {
-  c(node.object, st, "Expression");
-  if (node.computed) { c(node.property, st, "Expression"); }
-};
-base.ExportNamedDeclaration = base.ExportDefaultDeclaration = function (node, st, c) {
-  if (node.declaration)
-    { c(node.declaration, st, node.type === "ExportNamedDeclaration" || node.declaration.id ? "Statement" : "Expression"); }
-  if (node.source) { c(node.source, st, "Expression"); }
-};
-base.ExportAllDeclaration = function (node, st, c) {
-  c(node.source, st, "Expression");
-};
-base.ImportDeclaration = function (node, st, c) {
-  for (var i = 0, list = node.specifiers; i < list.length; i += 1)
-    {
-    var spec = list[i];
-
-    c(spec, st);
-  }
-  c(node.source, st, "Expression");
-};
-base.ImportSpecifier = base.ImportDefaultSpecifier = base.ImportNamespaceSpecifier = base.Identifier = base.Literal = ignore;
-
-base.TaggedTemplateExpression = function (node, st, c) {
-  c(node.tag, st, "Expression");
-  c(node.quasi, st, "Expression");
-};
-base.ClassDeclaration = base.ClassExpression = function (node, st, c) { return c(node, st, "Class"); };
-base.Class = function (node, st, c) {
-  if (node.id) { c(node.id, st, "Pattern"); }
-  if (node.superClass) { c(node.superClass, st, "Expression"); }
-  c(node.body, st);
-};
-base.ClassBody = function (node, st, c) {
-  for (var i = 0, list = node.body; i < list.length; i += 1)
-    {
-    var elt = list[i];
-
-    c(elt, st);
-  }
-};
-base.MethodDefinition = base.Property = function (node, st, c) {
-  if (node.computed) { c(node.key, st, "Expression"); }
-  c(node.value, st, "Expression");
-};
-
-exports.simple = simple;
-exports.ancestor = ancestor;
-exports.recursive = recursive;
-exports.full = full;
-exports.fullAncestor = fullAncestor;
-exports.findNodeAt = findNodeAt;
-exports.findNodeAround = findNodeAround;
-exports.findNodeAfter = findNodeAfter;
-exports.findNodeBefore = findNodeBefore;
-exports.make = make;
-exports.base = base;
-
-Object.defineProperty(exports, '__esModule', { value: true });
-
-})));
-//# sourceMappingURL=walk.js.map
+      var expr = list[i];
+
+      c(expr, st, "Expression");
+    }
+  };
+  base.TemplateLiteral = function (node, st, c) {
+    for (var i = 0, list = node.quasis; i < list.length; i += 1)
+      {
+      var quasi = list[i];
+
+      c(quasi, st);
+    }
+
+    for (var i$1 = 0, list$1 = node.expressions; i$1 < list$1.length; i$1 += 1)
+      {
+      var expr = list$1[i$1];
+
+      c(expr, st, "Expression");
+    }
+  };
+  base.TemplateElement = ignore;
+  base.UnaryExpression = base.UpdateExpression = function (node, st, c) {
+    c(node.argument, st, "Expression");
+  };
+  base.BinaryExpression = base.LogicalExpression = function (node, st, c) {
+    c(node.left, st, "Expression");
+    c(node.right, st, "Expression");
+  };
+  base.AssignmentExpression = base.AssignmentPattern = function (node, st, c) {
+    c(node.left, st, "Pattern");
+    c(node.right, st, "Expression");
+  };
+  base.ConditionalExpression = function (node, st, c) {
+    c(node.test, st, "Expression");
+    c(node.consequent, st, "Expression");
+    c(node.alternate, st, "Expression");
+  };
+  base.NewExpression = base.CallExpression = function (node, st, c) {
+    c(node.callee, st, "Expression");
+    if (node.arguments)
+      { for (var i = 0, list = node.arguments; i < list.length; i += 1)
+        {
+          var arg = list[i];
+
+          c(arg, st, "Expression");
+        } }
+  };
+  base.MemberExpression = function (node, st, c) {
+    c(node.object, st, "Expression");
+    if (node.computed) { c(node.property, st, "Expression"); }
+  };
+  base.ExportNamedDeclaration = base.ExportDefaultDeclaration = function (node, st, c) {
+    if (node.declaration)
+      { c(node.declaration, st, node.type === "ExportNamedDeclaration" || node.declaration.id ? "Statement" : "Expression"); }
+    if (node.source) { c(node.source, st, "Expression"); }
+  };
+  base.ExportAllDeclaration = function (node, st, c) {
+    c(node.source, st, "Expression");
+  };
+  base.ImportDeclaration = function (node, st, c) {
+    for (var i = 0, list = node.specifiers; i < list.length; i += 1)
+      {
+      var spec = list[i];
+
+      c(spec, st);
+    }
+    c(node.source, st, "Expression");
+  };
+  base.ImportSpecifier = base.ImportDefaultSpecifier = base.ImportNamespaceSpecifier = base.Identifier = base.Literal = base.Import = ignore;
+
+  base.TaggedTemplateExpression = function (node, st, c) {
+    c(node.tag, st, "Expression");
+    c(node.quasi, st, "Expression");
+  };
+  base.ClassDeclaration = base.ClassExpression = function (node, st, c) { return c(node, st, "Class"); };
+  base.Class = function (node, st, c) {
+    if (node.id) { c(node.id, st, "Pattern"); }
+    if (node.superClass) { c(node.superClass, st, "Expression"); }
+    c(node.body, st);
+  };
+  base.ClassBody = function (node, st, c) {
+    for (var i = 0, list = node.body; i < list.length; i += 1)
+      {
+      var elt = list[i];
+
+      c(elt, st);
+    }
+  };
+  base.MethodDefinition = base.Property = function (node, st, c) {
+    if (node.computed) { c(node.key, st, "Expression"); }
+    c(node.value, st, "Expression");
+  };
+
+  exports.ancestor = ancestor;
+  exports.base = base;
+  exports.findNodeAfter = findNodeAfter;
+  exports.findNodeAround = findNodeAround;
+  exports.findNodeAt = findNodeAt;
+  exports.findNodeBefore = findNodeBefore;
+  exports.full = full;
+  exports.fullAncestor = fullAncestor;
+  exports.make = make;
+  exports.recursive = recursive;
+  exports.simple = simple;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+}));
diff --git a/deps/acorn/acorn-walk/package.json b/deps/acorn/acorn-walk/package.json
index aee3f2584d2de2..239e6c729aedfe 100644
--- a/deps/acorn/acorn-walk/package.json
+++ b/deps/acorn/acorn-walk/package.json
@@ -4,7 +4,7 @@
   "homepage": "https://github.com/acornjs/acorn",
   "main": "dist/walk.js",
   "module": "dist/walk.mjs",
-  "version": "6.1.1",
+  "version": "6.2.0",
   "engines": {"node": ">=0.4.0"},
   "maintainers": [
     {
diff --git a/deps/acorn/acorn/CHANGELOG.md b/deps/acorn/acorn/CHANGELOG.md
index 430b0b5cd14247..f94f23ccf295b0 100644
--- a/deps/acorn/acorn/CHANGELOG.md
+++ b/deps/acorn/acorn/CHANGELOG.md
@@ -1,3 +1,25 @@
+## 6.2.0 (2019-07-04)
+
+### Bug fixes
+
+Improve valid assignment checking in `for`/`in` and `for`/`of` loops.
+
+Disallow binding `let` in patterns.
+
+### New features
+
+Support bigint syntax with `ecmaVersion` >= 10.
+
+Support dynamic `import` syntax with `ecmaVersion` >= 10.
+
+Upgrade to Unicode version 12.
+
+## 6.1.1 (2019-02-27)
+
+### Bug fixes
+
+Fix bug that caused parsing default exports of with names to fail.
+
 ## 6.1.0 (2019-02-08)
 
 ### Bug fixes
diff --git a/deps/acorn/acorn/README.md b/deps/acorn/acorn/README.md
index 9ffacdbc9e9552..fa372ee6821bab 100644
--- a/deps/acorn/acorn/README.md
+++ b/deps/acorn/acorn/README.md
@@ -54,7 +54,7 @@ an object containing any of these fields:
 - **ecmaVersion**: Indicates the ECMAScript version to parse. Must be
   either 3, 5, 6 (2015), 7 (2016), 8 (2017), 9 (2018) or 10 (2019, partial
   support). This influences support for strict mode, the set of
-  reserved words, and support for new syntax features. Default is 7.
+  reserved words, and support for new syntax features. Default is 9.
 
   **NOTE**: Only 'stage 4' (finalized) ECMAScript features are being
   implemented by Acorn. Other proposed new features can be implemented
@@ -86,7 +86,7 @@ an object containing any of these fields:
 - **allowImportExportEverywhere**: By default, `import` and `export`
   declarations can only appear at a program's top level. Setting this
   option to `true` allows them anywhere where a statement is allowed.
-
+  
 - **allowAwaitOutsideFunction**: By default, `await` expressions can
   only appear inside `async` functions. Setting this option to
   `true` allows to have top-level `await` expressions. They are
@@ -256,14 +256,11 @@ The utility spits out the syntax tree as JSON data.
 ## Existing plugins
 
  - [`acorn-jsx`](https://github.com/RReverser/acorn-jsx): Parse [Facebook JSX syntax extensions](https://github.com/facebook/jsx)
-
+ 
 Plugins for ECMAScript proposals:
-
+ 
  - [`acorn-stage3`](https://github.com/acornjs/acorn-stage3): Parse most stage 3 proposals, bundling:
-   - [`acorn-async-iteration`](https://github.com/acornjs/acorn-async-iteration): Parse [async iteration proposal](https://github.com/tc39/proposal-async-iteration)
-   - [`acorn-bigint`](https://github.com/acornjs/acorn-bigint): Parse [BigInt proposal](https://github.com/tc39/proposal-bigint)
    - [`acorn-class-fields`](https://github.com/acornjs/acorn-class-fields): Parse [class fields proposal](https://github.com/tc39/proposal-class-fields)
-   - [`acorn-dynamic-import`](https://github.com/kesne/acorn-dynamic-import): Parse [import() proposal](https://github.com/tc39/proposal-dynamic-import)
    - [`acorn-import-meta`](https://github.com/acornjs/acorn-import-meta): Parse [import.meta proposal](https://github.com/tc39/proposal-import-meta)
    - [`acorn-numeric-separator`](https://github.com/acornjs/acorn-numeric-separator): Parse [numeric separator proposal](https://github.com/tc39/proposal-numeric-separator)
    - [`acorn-private-methods`](https://github.com/acornjs/acorn-private-methods): parse [private methods, getters and setters proposal](https://github.com/tc39/proposal-private-methods)n
diff --git a/deps/acorn/acorn/dist/acorn.js b/deps/acorn/acorn/dist/acorn.js
index 44d95c5fae74db..dcb091fd4fe3d9 100644
--- a/deps/acorn/acorn/dist/acorn.js
+++ b/deps/acorn/acorn/dist/acorn.js
@@ -1,5018 +1,4964 @@
 (function (global, factory) {
-	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
-	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory((global.acorn = {})));
-}(this, (function (exports) { 'use strict';
-
-// Reserved word lists for various dialects of the language
-
-var reservedWords = {
-  3: "abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile",
-  5: "class enum extends super const export import",
-  6: "enum",
-  strict: "implements interface let package private protected public static yield",
-  strictBind: "eval arguments"
-};
-
-// And the keywords
-
-var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";
-
-var keywords = {
-  5: ecma5AndLessKeywords,
-  6: ecma5AndLessKeywords + " const class extends export import super"
-};
-
-var keywordRelationalOperator = /^in(stanceof)?$/;
-
-// ## Character categories
-
-// Big ugly regular expressions that match characters in the
-// whitespace, identifier, and identifier-start categories. These
-// are only applied when a character is found to actually have a
-// code point above 128.
-// Generated by `bin/generate-identifier-regex.js`.
-
-var nonASCIIidentifierStartChars = "\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u037f\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u052f\u0531-\u0556\u0559\u0560-\u0588\u05d0-\u05ea\u05ef-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u0860-\u086a\u08a0-\u08b4\u08b6-\u08bd\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u09fc\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0af9\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c39\u0c3d\u0c58-\u0c5a\u0c60\u0c61\u0c80\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d54-\u0d56\u0d5f-\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f5\u13f8-\u13fd\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f8\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1878\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191e\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19b0-\u19c9\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1c80-\u1c88\u1c90-\u1cba\u1cbd-\u1cbf\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2118-\u211d\u2124\u2126\u2128\u212a-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309b-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312f\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fef\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua69d\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua7b9\ua7f7-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua8fd\ua8fe\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\ua9e0-\ua9e4\ua9e6-\ua9ef\ua9fa-\ua9fe\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa7e-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uab30-\uab5a\uab5c-\uab65\uab70-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc";
-var nonASCIIidentifierChars = "\u200c\u200d\xb7\u0300-\u036f\u0387\u0483-\u0487\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u0669\u0670\u06d6-\u06dc\u06df-\u06e4\u06e7\u06e8\u06ea-\u06ed\u06f0-\u06f9\u0711\u0730-\u074a\u07a6-\u07b0\u07c0-\u07c9\u07eb-\u07f3\u07fd\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0859-\u085b\u08d3-\u08e1\u08e3-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962\u0963\u0966-\u096f\u0981-\u0983\u09bc\u09be-\u09c4\u09c7\u09c8\u09cb-\u09cd\u09d7\u09e2\u09e3\u09e6-\u09ef\u09fe\u0a01-\u0a03\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a66-\u0a71\u0a75\u0a81-\u0a83\u0abc\u0abe-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ae2\u0ae3\u0ae6-\u0aef\u0afa-\u0aff\u0b01-\u0b03\u0b3c\u0b3e-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b66-\u0b6f\u0b82\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd7\u0be6-\u0bef\u0c00-\u0c04\u0c3e-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0c66-\u0c6f\u0c81-\u0c83\u0cbc\u0cbe-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0ce6-\u0cef\u0d00-\u0d03\u0d3b\u0d3c\u0d3e-\u0d44\u0d46-\u0d48\u0d4a-\u0d4d\u0d57\u0d62\u0d63\u0d66-\u0d6f\u0d82\u0d83\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0de6-\u0def\u0df2\u0df3\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0e50-\u0e59\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0ed0-\u0ed9\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f3e\u0f3f\u0f71-\u0f84\u0f86\u0f87\u0f8d-\u0f97\u0f99-\u0fbc\u0fc6\u102b-\u103e\u1040-\u1049\u1056-\u1059\u105e-\u1060\u1062-\u1064\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f-\u109d\u135d-\u135f\u1369-\u1371\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b4-\u17d3\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u18a9\u1920-\u192b\u1930-\u193b\u1946-\u194f\u19d0-\u19da\u1a17-\u1a1b\u1a55-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1ab0-\u1abd\u1b00-\u1b04\u1b34-\u1b44\u1b50-\u1b59\u1b6b-\u1b73\u1b80-\u1b82\u1ba1-\u1bad\u1bb0-\u1bb9\u1be6-\u1bf3\u1c24-\u1c37\u1c40-\u1c49\u1c50-\u1c59\u1cd0-\u1cd2\u1cd4-\u1ce8\u1ced\u1cf2-\u1cf4\u1cf7-\u1cf9\u1dc0-\u1df9\u1dfb-\u1dff\u203f\u2040\u2054\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2cef-\u2cf1\u2d7f\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua620-\ua629\ua66f\ua674-\ua67d\ua69e\ua69f\ua6f0\ua6f1\ua802\ua806\ua80b\ua823-\ua827\ua880\ua881\ua8b4-\ua8c5\ua8d0-\ua8d9\ua8e0-\ua8f1\ua8ff-\ua909\ua926-\ua92d\ua947-\ua953\ua980-\ua983\ua9b3-\ua9c0\ua9d0-\ua9d9\ua9e5\ua9f0-\ua9f9\uaa29-\uaa36\uaa43\uaa4c\uaa4d\uaa50-\uaa59\uaa7b-\uaa7d\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uaaeb-\uaaef\uaaf5\uaaf6\uabe3-\uabea\uabec\uabed\uabf0-\uabf9\ufb1e\ufe00-\ufe0f\ufe20-\ufe2f\ufe33\ufe34\ufe4d-\ufe4f\uff10-\uff19\uff3f";
-
-var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
-var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");
-
-nonASCIIidentifierStartChars = nonASCIIidentifierChars = null;
-
-// These are a run-length and offset encoded representation of the
-// >0xffff code points that are a valid part of identifiers. The
-// offset starts at 0x10000, and each pair of numbers represents an
-// offset to the next range, and then a size of the range. They were
-// generated by bin/generate-identifier-regex.js
-
-// eslint-disable-next-line comma-spacing
-var astralIdentifierStartCodes = [0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,14,29,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,28,43,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,14,35,477,28,11,0,9,21,190,52,76,44,33,24,27,35,30,0,12,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,54,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,86,26,230,43,117,63,32,0,257,0,11,39,8,0,22,0,12,39,3,3,20,0,35,56,264,8,2,36,18,0,50,29,113,6,2,1,2,37,22,0,26,5,2,1,2,31,15,0,328,18,270,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,689,63,129,68,12,0,67,12,65,1,31,6129,15,754,9486,286,82,395,2309,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,4149,196,60,67,1213,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42710,42,4148,12,221,3,5761,15,7472,3104,541];
-
-// eslint-disable-next-line comma-spacing
-var astralIdentifierCodes = [509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,574,3,9,9,525,10,176,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,6,1,45,0,13,2,49,13,9,3,4,9,83,11,7,0,161,11,6,9,7,3,56,1,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,5,0,82,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,243,14,166,9,280,9,41,6,2,3,9,0,10,10,47,15,406,7,2,7,17,9,57,21,2,13,123,5,4,0,2,1,2,6,2,0,9,9,49,4,2,1,2,4,9,9,330,3,19306,9,135,4,60,6,26,9,1016,45,17,3,19723,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,2214,6,110,6,6,9,792487,239];
-
-// This has a complexity linear to the value of the code. The
-// assumption is that looking up astral identifier characters is
-// rare.
-function isInAstralSet(code, set) {
-  var pos = 0x10000;
-  for (var i = 0; i < set.length; i += 2) {
-    pos += set[i];
-    if (pos > code) { return false }
-    pos += set[i + 1];
-    if (pos >= code) { return true }
-  }
-}
-
-// Test whether a given character code starts an identifier.
-
-function isIdentifierStart(code, astral) {
-  if (code < 65) { return code === 36 }
-  if (code < 91) { return true }
-  if (code < 97) { return code === 95 }
-  if (code < 123) { return true }
-  if (code <= 0xffff) { return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code)) }
-  if (astral === false) { return false }
-  return isInAstralSet(code, astralIdentifierStartCodes)
-}
-
-// Test whether a given character is part of an identifier.
-
-function isIdentifierChar(code, astral) {
-  if (code < 48) { return code === 36 }
-  if (code < 58) { return true }
-  if (code < 65) { return false }
-  if (code < 91) { return true }
-  if (code < 97) { return code === 95 }
-  if (code < 123) { return true }
-  if (code <= 0xffff) { return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code)) }
-  if (astral === false) { return false }
-  return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes)
-}
-
-// ## Token types
-
-// The assignment of fine-grained, information-carrying type objects
-// allows the tokenizer to store the information it has about a
-// token in a way that is very cheap for the parser to look up.
-
-// All token type variables start with an underscore, to make them
-// easy to recognize.
-
-// The `beforeExpr` property is used to disambiguate between regular
-// expressions and divisions. It is set on all token types that can
-// be followed by an expression (thus, a slash after them would be a
-// regular expression).
-//
-// The `startsExpr` property is used to check if the token ends a
-// `yield` expression. It is set on all token types that either can
-// directly start an expression (like a quotation mark) or can
-// continue an expression (like the body of a string).
-//
-// `isLoop` marks a keyword as starting a loop, which is important
-// to know when parsing a label, in order to allow or disallow
-// continue jumps to that label.
-
-var TokenType = function TokenType(label, conf) {
-  if ( conf === void 0 ) conf = {};
-
-  this.label = label;
-  this.keyword = conf.keyword;
-  this.beforeExpr = !!conf.beforeExpr;
-  this.startsExpr = !!conf.startsExpr;
-  this.isLoop = !!conf.isLoop;
-  this.isAssign = !!conf.isAssign;
-  this.prefix = !!conf.prefix;
-  this.postfix = !!conf.postfix;
-  this.binop = conf.binop || null;
-  this.updateContext = null;
-};
-
-function binop(name, prec) {
-  return new TokenType(name, {beforeExpr: true, binop: prec})
-}
-var beforeExpr = {beforeExpr: true};
-var startsExpr = {startsExpr: true};
-
-// Map keyword names to token types.
-
-var keywords$1 = {};
-
-// Succinct definitions of keyword token types
-function kw(name, options) {
-  if ( options === void 0 ) options = {};
-
-  options.keyword = name;
-  return keywords$1[name] = new TokenType(name, options)
-}
-
-var types = {
-  num: new TokenType("num", startsExpr),
-  regexp: new TokenType("regexp", startsExpr),
-  string: new TokenType("string", startsExpr),
-  name: new TokenType("name", startsExpr),
-  eof: new TokenType("eof"),
-
-  // Punctuation token types.
-  bracketL: new TokenType("[", {beforeExpr: true, startsExpr: true}),
-  bracketR: new TokenType("]"),
-  braceL: new TokenType("{", {beforeExpr: true, startsExpr: true}),
-  braceR: new TokenType("}"),
-  parenL: new TokenType("(", {beforeExpr: true, startsExpr: true}),
-  parenR: new TokenType(")"),
-  comma: new TokenType(",", beforeExpr),
-  semi: new TokenType(";", beforeExpr),
-  colon: new TokenType(":", beforeExpr),
-  dot: new TokenType("."),
-  question: new TokenType("?", beforeExpr),
-  arrow: new TokenType("=>", beforeExpr),
-  template: new TokenType("template"),
-  invalidTemplate: new TokenType("invalidTemplate"),
-  ellipsis: new TokenType("...", beforeExpr),
-  backQuote: new TokenType("`", startsExpr),
-  dollarBraceL: new TokenType("${", {beforeExpr: true, startsExpr: true}),
-
-  // Operators. These carry several kinds of properties to help the
-  // parser use them properly (the presence of these properties is
-  // what categorizes them as operators).
-  //
-  // `binop`, when present, specifies that this operator is a binary
-  // operator, and will refer to its precedence.
-  //
-  // `prefix` and `postfix` mark the operator as a prefix or postfix
-  // unary operator.
-  //
-  // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as
-  // binary operators with a very low precedence, that should result
-  // in AssignmentExpression nodes.
-
-  eq: new TokenType("=", {beforeExpr: true, isAssign: true}),
-  assign: new TokenType("_=", {beforeExpr: true, isAssign: true}),
-  incDec: new TokenType("++/--", {prefix: true, postfix: true, startsExpr: true}),
-  prefix: new TokenType("!/~", {beforeExpr: true, prefix: true, startsExpr: true}),
-  logicalOR: binop("||", 1),
-  logicalAND: binop("&&", 2),
-  bitwiseOR: binop("|", 3),
-  bitwiseXOR: binop("^", 4),
-  bitwiseAND: binop("&", 5),
-  equality: binop("==/!=/===/!==", 6),
-  relational: binop("</>/<=/>=", 7),
-  bitShift: binop("<</>>/>>>", 8),
-  plusMin: new TokenType("+/-", {beforeExpr: true, binop: 9, prefix: true, startsExpr: true}),
-  modulo: binop("%", 10),
-  star: binop("*", 10),
-  slash: binop("/", 10),
-  starstar: new TokenType("**", {beforeExpr: true}),
-
-  // Keyword token types.
-  _break: kw("break"),
-  _case: kw("case", beforeExpr),
-  _catch: kw("catch"),
-  _continue: kw("continue"),
-  _debugger: kw("debugger"),
-  _default: kw("default", beforeExpr),
-  _do: kw("do", {isLoop: true, beforeExpr: true}),
-  _else: kw("else", beforeExpr),
-  _finally: kw("finally"),
-  _for: kw("for", {isLoop: true}),
-  _function: kw("function", startsExpr),
-  _if: kw("if"),
-  _return: kw("return", beforeExpr),
-  _switch: kw("switch"),
-  _throw: kw("throw", beforeExpr),
-  _try: kw("try"),
-  _var: kw("var"),
-  _const: kw("const"),
-  _while: kw("while", {isLoop: true}),
-  _with: kw("with"),
-  _new: kw("new", {beforeExpr: true, startsExpr: true}),
-  _this: kw("this", startsExpr),
-  _super: kw("super", startsExpr),
-  _class: kw("class", startsExpr),
-  _extends: kw("extends", beforeExpr),
-  _export: kw("export"),
-  _import: kw("import"),
-  _null: kw("null", startsExpr),
-  _true: kw("true", startsExpr),
-  _false: kw("false", startsExpr),
-  _in: kw("in", {beforeExpr: true, binop: 7}),
-  _instanceof: kw("instanceof", {beforeExpr: true, binop: 7}),
-  _typeof: kw("typeof", {beforeExpr: true, prefix: true, startsExpr: true}),
-  _void: kw("void", {beforeExpr: true, prefix: true, startsExpr: true}),
-  _delete: kw("delete", {beforeExpr: true, prefix: true, startsExpr: true})
-};
-
-// Matches a whole line break (where CRLF is considered a single
-// line break). Used to count lines.
-
-var lineBreak = /\r\n?|\n|\u2028|\u2029/;
-var lineBreakG = new RegExp(lineBreak.source, "g");
-
-function isNewLine(code, ecma2019String) {
-  return code === 10 || code === 13 || (!ecma2019String && (code === 0x2028 || code === 0x2029))
-}
-
-var nonASCIIwhitespace = /[\u1680\u2000-\u200a\u202f\u205f\u3000\ufeff]/;
-
-var skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g;
-
-var ref = Object.prototype;
-var hasOwnProperty = ref.hasOwnProperty;
-var toString = ref.toString;
-
-// Checks if an object has a property.
-
-function has(obj, propName) {
-  return hasOwnProperty.call(obj, propName)
-}
-
-var isArray = Array.isArray || (function (obj) { return (
-  toString.call(obj) === "[object Array]"
-); });
-
-function wordsRegexp(words) {
-  return new RegExp("^(?:" + words.replace(/ /g, "|") + ")$")
-}
-
-// These are used when `options.locations` is on, for the
-// `startLoc` and `endLoc` properties.
-
-var Position = function Position(line, col) {
-  this.line = line;
-  this.column = col;
-};
-
-Position.prototype.offset = function offset (n) {
-  return new Position(this.line, this.column + n)
-};
-
-var SourceLocation = function SourceLocation(p, start, end) {
-  this.start = start;
-  this.end = end;
-  if (p.sourceFile !== null) { this.source = p.sourceFile; }
-};
-
-// The `getLineInfo` function is mostly useful when the
-// `locations` option is off (for performance reasons) and you
-// want to find the line/column position for a given character
-// offset. `input` should be the code string that the offset refers
-// into.
-
-function getLineInfo(input, offset) {
-  for (var line = 1, cur = 0;;) {
-    lineBreakG.lastIndex = cur;
-    var match = lineBreakG.exec(input);
-    if (match && match.index < offset) {
-      ++line;
-      cur = match.index + match[0].length;
-    } else {
-      return new Position(line, offset - cur)
-    }
-  }
-}
-
-// A second optional argument can be given to further configure
-// the parser process. These options are recognized:
-
-var defaultOptions = {
-  // `ecmaVersion` indicates the ECMAScript version to parse. Must be
-  // either 3, 5, 6 (2015), 7 (2016), 8 (2017), 9 (2018), or 10
-  // (2019). This influences support for strict mode, the set of
-  // reserved words, and support for new syntax features. The default
-  // is 9.
-  ecmaVersion: 9,
-  // `sourceType` indicates the mode the code should be parsed in.
-  // Can be either `"script"` or `"module"`. This influences global
-  // strict mode and parsing of `import` and `export` declarations.
-  sourceType: "script",
-  // `onInsertedSemicolon` can be a callback that will be called
-  // when a semicolon is automatically inserted. It will be passed
-  // the position of the comma as an offset, and if `locations` is
-  // enabled, it is given the location as a `{line, column}` object
-  // as second argument.
-  onInsertedSemicolon: null,
-  // `onTrailingComma` is similar to `onInsertedSemicolon`, but for
-  // trailing commas.
-  onTrailingComma: null,
-  // By default, reserved words are only enforced if ecmaVersion >= 5.
-  // Set `allowReserved` to a boolean value to explicitly turn this on
-  // an off. When this option has the value "never", reserved words
-  // and keywords can also not be used as property names.
-  allowReserved: null,
-  // When enabled, a return at the top level is not considered an
-  // error.
-  allowReturnOutsideFunction: false,
-  // When enabled, import/export statements are not constrained to
-  // appearing at the top of the program.
-  allowImportExportEverywhere: false,
-  // When enabled, await identifiers are allowed to appear at the top-level scope,
-  // but they are still not allowed in non-async functions.
-  allowAwaitOutsideFunction: false,
-  // When enabled, hashbang directive in the beginning of file
-  // is allowed and treated as a line comment.
-  allowHashBang: false,
-  // When `locations` is on, `loc` properties holding objects with
-  // `start` and `end` properties in `{line, column}` form (with
-  // line being 1-based and column 0-based) will be attached to the
-  // nodes.
-  locations: false,
-  // A function can be passed as `onToken` option, which will
-  // cause Acorn to call that function with object in the same
-  // format as tokens returned from `tokenizer().getToken()`. Note
-  // that you are not allowed to call the parser from the
-  // callback—that will corrupt its internal state.
-  onToken: null,
-  // A function can be passed as `onComment` option, which will
-  // cause Acorn to call that function with `(block, text, start,
-  // end)` parameters whenever a comment is skipped. `block` is a
-  // boolean indicating whether this is a block (`/* */`) comment,
-  // `text` is the content of the comment, and `start` and `end` are
-  // character offsets that denote the start and end of the comment.
-  // When the `locations` option is on, two more parameters are
-  // passed, the full `{line, column}` locations of the start and
-  // end of the comments. Note that you are not allowed to call the
-  // parser from the callback—that will corrupt its internal state.
-  onComment: null,
-  // Nodes have their start and end characters offsets recorded in
-  // `start` and `end` properties (directly on the node, rather than
-  // the `loc` object, which holds line/column data. To also add a
-  // [semi-standardized][range] `range` property holding a `[start,
-  // end]` array with the same numbers, set the `ranges` option to
-  // `true`.
-  //
-  // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
-  ranges: false,
-  // It is possible to parse multiple files into a single AST by
-  // passing the tree produced by parsing the first file as
-  // `program` option in subsequent parses. This will add the
-  // toplevel forms of the parsed file to the `Program` (top) node
-  // of an existing parse tree.
-  program: null,
-  // When `locations` is on, you can pass this to record the source
-  // file in every node's `loc` object.
-  sourceFile: null,
-  // This value, if given, is stored in every node, whether
-  // `locations` is on or off.
-  directSourceFile: null,
-  // When enabled, parenthesized expressions are represented by
-  // (non-standard) ParenthesizedExpression nodes
-  preserveParens: false
-};
-
-// Interpret and default an options object
-
-function getOptions(opts) {
-  var options = {};
-
-  for (var opt in defaultOptions)
-    { options[opt] = opts && has(opts, opt) ? opts[opt] : defaultOptions[opt]; }
-
-  if (options.ecmaVersion >= 2015)
-    { options.ecmaVersion -= 2009; }
-
-  if (options.allowReserved == null)
-    { options.allowReserved = options.ecmaVersion < 5; }
-
-  if (isArray(options.onToken)) {
-    var tokens = options.onToken;
-    options.onToken = function (token) { return tokens.push(token); };
-  }
-  if (isArray(options.onComment))
-    { options.onComment = pushComment(options, options.onComment); }
-
-  return options
-}
-
-function pushComment(options, array) {
-  return function(block, text, start, end, startLoc, endLoc) {
-    var comment = {
-      type: block ? "Block" : "Line",
-      value: text,
-      start: start,
-      end: end
-    };
-    if (options.locations)
-      { comment.loc = new SourceLocation(this, startLoc, endLoc); }
-    if (options.ranges)
-      { comment.range = [start, end]; }
-    array.push(comment);
-  }
-}
-
-// Each scope gets a bitset that may contain these flags
-var SCOPE_TOP = 1;
-var SCOPE_FUNCTION = 2;
-var SCOPE_VAR = SCOPE_TOP | SCOPE_FUNCTION;
-var SCOPE_ASYNC = 4;
-var SCOPE_GENERATOR = 8;
-var SCOPE_ARROW = 16;
-var SCOPE_SIMPLE_CATCH = 32;
-var SCOPE_SUPER = 64;
-var SCOPE_DIRECT_SUPER = 128;
-
-function functionFlags(async, generator) {
-  return SCOPE_FUNCTION | (async ? SCOPE_ASYNC : 0) | (generator ? SCOPE_GENERATOR : 0)
-}
-
-// Used in checkLVal and declareName to determine the type of a binding
-var BIND_NONE = 0;
-var BIND_VAR = 1;
-var BIND_LEXICAL = 2;
-var BIND_FUNCTION = 3;
-var BIND_SIMPLE_CATCH = 4;
-var BIND_OUTSIDE = 5; // Special case for function names as bound inside the function
-
-var Parser = function Parser(options, input, startPos) {
-  this.options = options = getOptions(options);
-  this.sourceFile = options.sourceFile;
-  this.keywords = wordsRegexp(keywords[options.ecmaVersion >= 6 ? 6 : 5]);
-  var reserved = "";
-  if (!options.allowReserved) {
-    for (var v = options.ecmaVersion;; v--)
-      { if (reserved = reservedWords[v]) { break } }
-    if (options.sourceType === "module") { reserved += " await"; }
-  }
-  this.reservedWords = wordsRegexp(reserved);
-  var reservedStrict = (reserved ? reserved + " " : "") + reservedWords.strict;
-  this.reservedWordsStrict = wordsRegexp(reservedStrict);
-  this.reservedWordsStrictBind = wordsRegexp(reservedStrict + " " + reservedWords.strictBind);
-  this.input = String(input);
-
-  // Used to signal to callers of `readWord1` whether the word
-  // contained any escape sequences. This is needed because words with
-  // escape sequences must not be interpreted as keywords.
-  this.containsEsc = false;
-
-  // Set up token state
-
-  // The current position of the tokenizer in the input.
-  if (startPos) {
-    this.pos = startPos;
-    this.lineStart = this.input.lastIndexOf("\n", startPos - 1) + 1;
-    this.curLine = this.input.slice(0, this.lineStart).split(lineBreak).length;
-  } else {
-    this.pos = this.lineStart = 0;
-    this.curLine = 1;
-  }
-
-  // Properties of the current token:
-  // Its type
-  this.type = types.eof;
-  // For tokens that include more information than their type, the value
-  this.value = null;
-  // Its start and end offset
-  this.start = this.end = this.pos;
-  // And, if locations are used, the {line, column} object
-  // corresponding to those offsets
-  this.startLoc = this.endLoc = this.curPosition();
-
-  // Position information for the previous token
-  this.lastTokEndLoc = this.lastTokStartLoc = null;
-  this.lastTokStart = this.lastTokEnd = this.pos;
-
-  // The context stack is used to superficially track syntactic
-  // context to predict whether a regular expression is allowed in a
-  // given position.
-  this.context = this.initialContext();
-  this.exprAllowed = true;
-
-  // Figure out if it's a module code.
-  this.inModule = options.sourceType === "module";
-  this.strict = this.inModule || this.strictDirective(this.pos);
-
-  // Used to signify the start of a potential arrow function
-  this.potentialArrowAt = -1;
-
-  // Positions to delayed-check that yield/await does not exist in default parameters.
-  this.yieldPos = this.awaitPos = this.awaitIdentPos = 0;
-  // Labels in scope.
-  this.labels = [];
-  // Thus-far undefined exports.
-  this.undefinedExports = {};
-
-  // If enabled, skip leading hashbang line.
-  if (this.pos === 0 && options.allowHashBang && this.input.slice(0, 2) === "#!")
-    { this.skipLineComment(2); }
-
-  // Scope tracking for duplicate variable names (see scope.js)
-  this.scopeStack = [];
-  this.enterScope(SCOPE_TOP);
-
-  // For RegExp validation
-  this.regexpState = null;
-};
-
-var prototypeAccessors = { inFunction: { configurable: true },inGenerator: { configurable: true },inAsync: { configurable: true },allowSuper: { configurable: true },allowDirectSuper: { configurable: true },treatFunctionsAsVar: { configurable: true } };
-
-Parser.prototype.parse = function parse () {
-  var node = this.options.program || this.startNode();
-  this.nextToken();
-  return this.parseTopLevel(node)
-};
-
-prototypeAccessors.inFunction.get = function () { return (this.currentVarScope().flags & SCOPE_FUNCTION) > 0 };
-prototypeAccessors.inGenerator.get = function () { return (this.currentVarScope().flags & SCOPE_GENERATOR) > 0 };
-prototypeAccessors.inAsync.get = function () { return (this.currentVarScope().flags & SCOPE_ASYNC) > 0 };
-prototypeAccessors.allowSuper.get = function () { return (this.currentThisScope().flags & SCOPE_SUPER) > 0 };
-prototypeAccessors.allowDirectSuper.get = function () { return (this.currentThisScope().flags & SCOPE_DIRECT_SUPER) > 0 };
-prototypeAccessors.treatFunctionsAsVar.get = function () { return this.treatFunctionsAsVarInScope(this.currentScope()) };
-
-// Switch to a getter for 7.0.0.
-Parser.prototype.inNonArrowFunction = function inNonArrowFunction () { return (this.currentThisScope().flags & SCOPE_FUNCTION) > 0 };
-
-Parser.extend = function extend () {
-    var plugins = [], len = arguments.length;
-    while ( len-- ) plugins[ len ] = arguments[ len ];
-
-  var cls = this;
-  for (var i = 0; i < plugins.length; i++) { cls = plugins[i](cls); }
-  return cls
-};
-
-Parser.parse = function parse (input, options) {
-  return new this(options, input).parse()
-};
-
-Parser.parseExpressionAt = function parseExpressionAt (input, pos, options) {
-  var parser = new this(options, input, pos);
-  parser.nextToken();
-  return parser.parseExpression()
-};
-
-Parser.tokenizer = function tokenizer (input, options) {
-  return new this(options, input)
-};
-
-Object.defineProperties( Parser.prototype, prototypeAccessors );
-
-var pp = Parser.prototype;
-
-// ## Parser utilities
-
-var literal = /^(?:'((?:\\.|[^'])*?)'|"((?:\\.|[^"])*?)")/;
-pp.strictDirective = function(start) {
-  var this$1 = this;
-
-  for (;;) {
-    // Try to find string literal.
-    skipWhiteSpace.lastIndex = start;
-    start += skipWhiteSpace.exec(this$1.input)[0].length;
-    var match = literal.exec(this$1.input.slice(start));
-    if (!match) { return false }
-    if ((match[1] || match[2]) === "use strict") { return true }
-    start += match[0].length;
-
-    // Skip semicolon, if any.
-    skipWhiteSpace.lastIndex = start;
-    start += skipWhiteSpace.exec(this$1.input)[0].length;
-    if (this$1.input[start] === ";")
-      { start++; }
-  }
-};
-
-// Predicate that tests whether the next token is of the given
-// type, and if yes, consumes it as a side effect.
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (global = global || self, factory(global.acorn = {}));
+}(this, function (exports) { 'use strict';
+
+  // Reserved word lists for various dialects of the language
+
+  var reservedWords = {
+    3: "abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile",
+    5: "class enum extends super const export import",
+    6: "enum",
+    strict: "implements interface let package private protected public static yield",
+    strictBind: "eval arguments"
+  };
 
-pp.eat = function(type) {
-  if (this.type === type) {
-    this.next();
-    return true
-  } else {
-    return false
-  }
-};
+  // And the keywords
 
-// Tests whether parsed token is a contextual keyword.
+  var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";
 
-pp.isContextual = function(name) {
-  return this.type === types.name && this.value === name && !this.containsEsc
-};
+  var keywords = {
+    5: ecma5AndLessKeywords,
+    6: ecma5AndLessKeywords + " const class extends export import super"
+  };
 
-// Consumes contextual keyword if possible.
+  var keywordRelationalOperator = /^in(stanceof)?$/;
 
-pp.eatContextual = function(name) {
-  if (!this.isContextual(name)) { return false }
-  this.next();
-  return true
-};
+  // ## Character categories
 
-// Asserts that following token is given contextual keyword.
+  // Big ugly regular expressions that match characters in the
+  // whitespace, identifier, and identifier-start categories. These
+  // are only applied when a character is found to actually have a
+  // code point above 128.
+  // Generated by `bin/generate-identifier-regex.js`.
 
-pp.expectContextual = function(name) {
-  if (!this.eatContextual(name)) { this.unexpected(); }
-};
+  var nonASCIIidentifierStartChars = "aab5bac0-d6d8-f6f8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u037f\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u052f\u0531-\u0556\u0559\u0560-\u0588\u05d0-\u05ea\u05ef-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u0860-\u086a\u08a0-\u08b4\u08b6-\u08bd\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u09fc\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0af9\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c39\u0c3d\u0c58-\u0c5a\u0c60\u0c61\u0c80\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d54-\u0d56\u0d5f-\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e86-\u0e8a\u0e8c-\u0ea3\u0ea5\u0ea7-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f5\u13f8-\u13fd\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f8\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1878\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191e\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19b0-\u19c9\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1c80-\u1c88\u1c90-\u1cba\u1cbd-\u1cbf\u1ce9-\u1cec\u1cee-\u1cf3\u1cf5\u1cf6\u1cfa\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2118-\u211d\u2124\u2126\u2128\u212a-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309b-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312f\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fef\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua69d\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua7bf\ua7c2-\ua7c6\ua7f7-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua8fd\ua8fe\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\ua9e0-\ua9e4\ua9e6-\ua9ef\ua9fa-\ua9fe\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa7e-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uab30-\uab5a\uab5c-\uab67\uab70-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc";
+  var nonASCIIidentifierChars = "\u200c\u200db7\u0300-\u036f\u0387\u0483-\u0487\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u0669\u0670\u06d6-\u06dc\u06df-\u06e4\u06e7\u06e8\u06ea-\u06ed\u06f0-\u06f9\u0711\u0730-\u074a\u07a6-\u07b0\u07c0-\u07c9\u07eb-\u07f3\u07fd\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0859-\u085b\u08d3-\u08e1\u08e3-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962\u0963\u0966-\u096f\u0981-\u0983\u09bc\u09be-\u09c4\u09c7\u09c8\u09cb-\u09cd\u09d7\u09e2\u09e3\u09e6-\u09ef\u09fe\u0a01-\u0a03\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a66-\u0a71\u0a75\u0a81-\u0a83\u0abc\u0abe-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ae2\u0ae3\u0ae6-\u0aef\u0afa-\u0aff\u0b01-\u0b03\u0b3c\u0b3e-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b66-\u0b6f\u0b82\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd7\u0be6-\u0bef\u0c00-\u0c04\u0c3e-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0c66-\u0c6f\u0c81-\u0c83\u0cbc\u0cbe-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0ce6-\u0cef\u0d00-\u0d03\u0d3b\u0d3c\u0d3e-\u0d44\u0d46-\u0d48\u0d4a-\u0d4d\u0d57\u0d62\u0d63\u0d66-\u0d6f\u0d82\u0d83\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0de6-\u0def\u0df2\u0df3\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0e50-\u0e59\u0eb1\u0eb4-\u0ebc\u0ec8-\u0ecd\u0ed0-\u0ed9\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f3e\u0f3f\u0f71-\u0f84\u0f86\u0f87\u0f8d-\u0f97\u0f99-\u0fbc\u0fc6\u102b-\u103e\u1040-\u1049\u1056-\u1059\u105e-\u1060\u1062-\u1064\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f-\u109d\u135d-\u135f\u1369-\u1371\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b4-\u17d3\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u18a9\u1920-\u192b\u1930-\u193b\u1946-\u194f\u19d0-\u19da\u1a17-\u1a1b\u1a55-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1ab0-\u1abd\u1b00-\u1b04\u1b34-\u1b44\u1b50-\u1b59\u1b6b-\u1b73\u1b80-\u1b82\u1ba1-\u1bad\u1bb0-\u1bb9\u1be6-\u1bf3\u1c24-\u1c37\u1c40-\u1c49\u1c50-\u1c59\u1cd0-\u1cd2\u1cd4-\u1ce8\u1ced\u1cf4\u1cf7-\u1cf9\u1dc0-\u1df9\u1dfb-\u1dff\u203f\u2040\u2054\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2cef-\u2cf1\u2d7f\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua620-\ua629\ua66f\ua674-\ua67d\ua69e\ua69f\ua6f0\ua6f1\ua802\ua806\ua80b\ua823-\ua827\ua880\ua881\ua8b4-\ua8c5\ua8d0-\ua8d9\ua8e0-\ua8f1\ua8ff-\ua909\ua926-\ua92d\ua947-\ua953\ua980-\ua983\ua9b3-\ua9c0\ua9d0-\ua9d9\ua9e5\ua9f0-\ua9f9\uaa29-\uaa36\uaa43\uaa4c\uaa4d\uaa50-\uaa59\uaa7b-\uaa7d\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uaaeb-\uaaef\uaaf5\uaaf6\uabe3-\uabea\uabec\uabed\uabf0-\uabf9\ufb1e\ufe00-\ufe0f\ufe20-\ufe2f\ufe33\ufe34\ufe4d-\ufe4f\uff10-\uff19\uff3f";
 
-// Test whether a semicolon can be inserted at the current position.
+  var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
+  var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");
 
-pp.canInsertSemicolon = function() {
-  return this.type === types.eof ||
-    this.type === types.braceR ||
-    lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
-};
+  nonASCIIidentifierStartChars = nonASCIIidentifierChars = null;
 
-pp.insertSemicolon = function() {
-  if (this.canInsertSemicolon()) {
-    if (this.options.onInsertedSemicolon)
-      { this.options.onInsertedSemicolon(this.lastTokEnd, this.lastTokEndLoc); }
-    return true
-  }
-};
+  // These are a run-length and offset encoded representation of the
+  // >0xffff code points that are a valid part of identifiers. The
+  // offset starts at 0x10000, and each pair of numbers represents an
+  // offset to the next range, and then a size of the range. They were
+  // generated by bin/generate-identifier-regex.js
 
-// Consume a semicolon, or, failing that, see if we are allowed to
-// pretend that there is a semicolon at this position.
+  // eslint-disable-next-line comma-spacing
+  var astralIdentifierStartCodes = [0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,14,29,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,28,43,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,14,35,477,28,11,0,9,21,155,22,13,52,76,44,33,24,27,35,30,0,12,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,21,0,33,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,14,0,72,26,230,43,117,63,32,0,161,7,3,38,17,0,2,0,29,0,11,39,8,0,22,0,12,45,20,0,35,56,264,8,2,36,18,0,50,29,113,6,2,1,2,37,22,0,26,5,2,1,2,31,15,0,328,18,270,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,689,63,129,74,6,0,67,12,65,1,2,0,29,6135,9,754,9486,286,50,2,18,3,9,395,2309,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,2357,44,11,6,17,0,370,43,1301,196,60,67,8,0,1205,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42710,42,4148,12,221,3,5761,15,7472,3104,541];
 
-pp.semicolon = function() {
-  if (!this.eat(types.semi) && !this.insertSemicolon()) { this.unexpected(); }
-};
+  // eslint-disable-next-line comma-spacing
+  var astralIdentifierCodes = [509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,574,3,9,9,525,10,176,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,6,1,45,0,13,2,49,13,9,3,4,9,83,11,7,0,161,11,6,9,7,3,56,1,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,5,0,82,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,243,14,166,9,232,6,3,6,4,0,29,9,41,6,2,3,9,0,10,10,47,15,406,7,2,7,17,9,57,21,2,13,123,5,4,0,2,1,2,6,2,0,9,9,49,4,2,1,2,4,9,9,330,3,19306,9,135,4,60,6,26,9,1014,0,2,54,8,3,19723,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,262,6,10,9,419,13,1495,6,110,6,6,9,792487,239];
 
-pp.afterTrailingComma = function(tokType, notNext) {
-  if (this.type === tokType) {
-    if (this.options.onTrailingComma)
-      { this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc); }
-    if (!notNext)
-      { this.next(); }
-    return true
-  }
-};
-
-// Expect a token of a given type. If found, consume it, otherwise,
-// raise an unexpected token error.
-
-pp.expect = function(type) {
-  this.eat(type) || this.unexpected();
-};
-
-// Raise an unexpected token error.
-
-pp.unexpected = function(pos) {
-  this.raise(pos != null ? pos : this.start, "Unexpected token");
-};
-
-function DestructuringErrors() {
-  this.shorthandAssign =
-  this.trailingComma =
-  this.parenthesizedAssign =
-  this.parenthesizedBind =
-  this.doubleProto =
-    -1;
-}
-
-pp.checkPatternErrors = function(refDestructuringErrors, isAssign) {
-  if (!refDestructuringErrors) { return }
-  if (refDestructuringErrors.trailingComma > -1)
-    { this.raiseRecoverable(refDestructuringErrors.trailingComma, "Comma is not permitted after the rest element"); }
-  var parens = isAssign ? refDestructuringErrors.parenthesizedAssign : refDestructuringErrors.parenthesizedBind;
-  if (parens > -1) { this.raiseRecoverable(parens, "Parenthesized pattern"); }
-};
-
-pp.checkExpressionErrors = function(refDestructuringErrors, andThrow) {
-  if (!refDestructuringErrors) { return false }
-  var shorthandAssign = refDestructuringErrors.shorthandAssign;
-  var doubleProto = refDestructuringErrors.doubleProto;
-  if (!andThrow) { return shorthandAssign >= 0 || doubleProto >= 0 }
-  if (shorthandAssign >= 0)
-    { this.raise(shorthandAssign, "Shorthand property assignments are valid only in destructuring patterns"); }
-  if (doubleProto >= 0)
-    { this.raiseRecoverable(doubleProto, "Redefinition of __proto__ property"); }
-};
-
-pp.checkYieldAwaitInDefaultParams = function() {
-  if (this.yieldPos && (!this.awaitPos || this.yieldPos < this.awaitPos))
-    { this.raise(this.yieldPos, "Yield expression cannot be a default value"); }
-  if (this.awaitPos)
-    { this.raise(this.awaitPos, "Await expression cannot be a default value"); }
-};
-
-pp.isSimpleAssignTarget = function(expr) {
-  if (expr.type === "ParenthesizedExpression")
-    { return this.isSimpleAssignTarget(expr.expression) }
-  return expr.type === "Identifier" || expr.type === "MemberExpression"
-};
-
-var pp$1 = Parser.prototype;
-
-// ### Statement parsing
-
-// Parse a program. Initializes the parser, reads any number of
-// statements, and wraps them in a Program node.  Optionally takes a
-// `program` argument.  If present, the statements will be appended
-// to its body instead of creating a new node.
-
-pp$1.parseTopLevel = function(node) {
-  var this$1 = this;
-
-  var exports = {};
-  if (!node.body) { node.body = []; }
-  while (this.type !== types.eof) {
-    var stmt = this$1.parseStatement(null, true, exports);
-    node.body.push(stmt);
+  // This has a complexity linear to the value of the code. The
+  // assumption is that looking up astral identifier characters is
+  // rare.
+  function isInAstralSet(code, set) {
+    var pos = 0x10000;
+    for (var i = 0; i < set.length; i += 2) {
+      pos += set[i];
+      if (pos > code) { return false }
+      pos += set[i + 1];
+      if (pos >= code) { return true }
+    }
   }
-  if (this.inModule)
-    { for (var i = 0, list = Object.keys(this$1.undefinedExports); i < list.length; i += 1)
-      {
-        var name = list[i];
 
-        this$1.raiseRecoverable(this$1.undefinedExports[name].start, ("Export '" + name + "' is not defined"));
-      } }
-  this.adaptDirectivePrologue(node.body);
-  this.next();
-  if (this.options.ecmaVersion >= 6) {
-    node.sourceType = this.options.sourceType;
-  }
-  return this.finishNode(node, "Program")
-};
-
-var loopLabel = {kind: "loop"};
-var switchLabel = {kind: "switch"};
-
-pp$1.isLet = function(context) {
-  if (this.options.ecmaVersion < 6 || !this.isContextual("let")) { return false }
-  skipWhiteSpace.lastIndex = this.pos;
-  var skip = skipWhiteSpace.exec(this.input);
-  var next = this.pos + skip[0].length, nextCh = this.input.charCodeAt(next);
-  // For ambiguous cases, determine if a LexicalDeclaration (or only a
-  // Statement) is allowed here. If context is not empty then only a Statement
-  // is allowed. However, `let [` is an explicit negative lookahead for
-  // ExpressionStatement, so special-case it first.
-  if (nextCh === 91) { return true } // '['
-  if (context) { return false }
-
-  if (nextCh === 123) { return true } // '{'
-  if (isIdentifierStart(nextCh, true)) {
-    var pos = next + 1;
-    while (isIdentifierChar(this.input.charCodeAt(pos), true)) { ++pos; }
-    var ident = this.input.slice(next, pos);
-    if (!keywordRelationalOperator.test(ident)) { return true }
-  }
-  return false
-};
-
-// check 'async [no LineTerminator here] function'
-// - 'async /*foo*/ function' is OK.
-// - 'async /*\n*/ function' is invalid.
-pp$1.isAsyncFunction = function() {
-  if (this.options.ecmaVersion < 8 || !this.isContextual("async"))
-    { return false }
-
-  skipWhiteSpace.lastIndex = this.pos;
-  var skip = skipWhiteSpace.exec(this.input);
-  var next = this.pos + skip[0].length;
-  return !lineBreak.test(this.input.slice(this.pos, next)) &&
-    this.input.slice(next, next + 8) === "function" &&
-    (next + 8 === this.input.length || !isIdentifierChar(this.input.charAt(next + 8)))
-};
-
-// Parse a single statement.
-//
-// If expecting a statement and finding a slash operator, parse a
-// regular expression literal. This is to handle cases like
-// `if (foo) /blah/.exec(foo)`, where looking at the previous token
-// does not help.
-
-pp$1.parseStatement = function(context, topLevel, exports) {
-  var starttype = this.type, node = this.startNode(), kind;
-
-  if (this.isLet(context)) {
-    starttype = types._var;
-    kind = "let";
+  // Test whether a given character code starts an identifier.
+
+  function isIdentifierStart(code, astral) {
+    if (code < 65) { return code === 36 }
+    if (code < 91) { return true }
+    if (code < 97) { return code === 95 }
+    if (code < 123) { return true }
+    if (code <= 0xffff) { return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code)) }
+    if (astral === false) { return false }
+    return isInAstralSet(code, astralIdentifierStartCodes)
   }
 
-  // Most types of statements are recognized by the keyword they
-  // start with. Many are trivial to parse, some require a bit of
-  // complexity.
-
-  switch (starttype) {
-  case types._break: case types._continue: return this.parseBreakContinueStatement(node, starttype.keyword)
-  case types._debugger: return this.parseDebuggerStatement(node)
-  case types._do: return this.parseDoStatement(node)
-  case types._for: return this.parseForStatement(node)
-  case types._function:
-    // Function as sole body of either an if statement or a labeled statement
-    // works, but not when it is part of a labeled statement that is the sole
-    // body of an if statement.
-    if ((context && (this.strict || context !== "if" && context !== "label")) && this.options.ecmaVersion >= 6) { this.unexpected(); }
-    return this.parseFunctionStatement(node, false, !context)
-  case types._class:
-    if (context) { this.unexpected(); }
-    return this.parseClass(node, true)
-  case types._if: return this.parseIfStatement(node)
-  case types._return: return this.parseReturnStatement(node)
-  case types._switch: return this.parseSwitchStatement(node)
-  case types._throw: return this.parseThrowStatement(node)
-  case types._try: return this.parseTryStatement(node)
-  case types._const: case types._var:
-    kind = kind || this.value;
-    if (context && kind !== "var") { this.unexpected(); }
-    return this.parseVarStatement(node, kind)
-  case types._while: return this.parseWhileStatement(node)
-  case types._with: return this.parseWithStatement(node)
-  case types.braceL: return this.parseBlock(true, node)
-  case types.semi: return this.parseEmptyStatement(node)
-  case types._export:
-  case types._import:
-    if (!this.options.allowImportExportEverywhere) {
-      if (!topLevel)
-        { this.raise(this.start, "'import' and 'export' may only appear at the top level"); }
-      if (!this.inModule)
-        { this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'"); }
-    }
-    return starttype === types._import ? this.parseImport(node) : this.parseExport(node, exports)
-
-    // If the statement does not start with a statement keyword or a
-    // brace, it's an ExpressionStatement or LabeledStatement. We
-    // simply start parsing an expression, and afterwards, if the
-    // next token is a colon and the expression was a simple
-    // Identifier node, we switch to interpreting it as a label.
-  default:
-    if (this.isAsyncFunction()) {
-      if (context) { this.unexpected(); }
-      this.next();
-      return this.parseFunctionStatement(node, true, !context)
-    }
+  // Test whether a given character is part of an identifier.
 
-    var maybeName = this.value, expr = this.parseExpression();
-    if (starttype === types.name && expr.type === "Identifier" && this.eat(types.colon))
-      { return this.parseLabeledStatement(node, maybeName, expr, context) }
-    else { return this.parseExpressionStatement(node, expr) }
+  function isIdentifierChar(code, astral) {
+    if (code < 48) { return code === 36 }
+    if (code < 58) { return true }
+    if (code < 65) { return false }
+    if (code < 91) { return true }
+    if (code < 97) { return code === 95 }
+    if (code < 123) { return true }
+    if (code <= 0xffff) { return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code)) }
+    if (astral === false) { return false }
+    return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes)
   }
-};
 
-pp$1.parseBreakContinueStatement = function(node, keyword) {
-  var this$1 = this;
+  // ## Token types
 
-  var isBreak = keyword === "break";
-  this.next();
-  if (this.eat(types.semi) || this.insertSemicolon()) { node.label = null; }
-  else if (this.type !== types.name) { this.unexpected(); }
-  else {
-    node.label = this.parseIdent();
-    this.semicolon();
-  }
+  // The assignment of fine-grained, information-carrying type objects
+  // allows the tokenizer to store the information it has about a
+  // token in a way that is very cheap for the parser to look up.
 
-  // Verify that there is an actual destination to break or
-  // continue to.
-  var i = 0;
-  for (; i < this.labels.length; ++i) {
-    var lab = this$1.labels[i];
-    if (node.label == null || lab.name === node.label.name) {
-      if (lab.kind != null && (isBreak || lab.kind === "loop")) { break }
-      if (node.label && isBreak) { break }
-    }
-  }
-  if (i === this.labels.length) { this.raise(node.start, "Unsyntactic " + keyword); }
-  return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement")
-};
-
-pp$1.parseDebuggerStatement = function(node) {
-  this.next();
-  this.semicolon();
-  return this.finishNode(node, "DebuggerStatement")
-};
-
-pp$1.parseDoStatement = function(node) {
-  this.next();
-  this.labels.push(loopLabel);
-  node.body = this.parseStatement("do");
-  this.labels.pop();
-  this.expect(types._while);
-  node.test = this.parseParenExpression();
-  if (this.options.ecmaVersion >= 6)
-    { this.eat(types.semi); }
-  else
-    { this.semicolon(); }
-  return this.finishNode(node, "DoWhileStatement")
-};
-
-// Disambiguating between a `for` and a `for`/`in` or `for`/`of`
-// loop is non-trivial. Basically, we have to parse the init `var`
-// statement or expression, disallowing the `in` operator (see
-// the second parameter to `parseExpression`), and then check
-// whether the next token is `in` or `of`. When there is no init
-// part (semicolon immediately after the opening parenthesis), it
-// is a regular `for` loop.
-
-pp$1.parseForStatement = function(node) {
-  this.next();
-  var awaitAt = (this.options.ecmaVersion >= 9 && (this.inAsync || (!this.inFunction && this.options.allowAwaitOutsideFunction)) && this.eatContextual("await")) ? this.lastTokStart : -1;
-  this.labels.push(loopLabel);
-  this.enterScope(0);
-  this.expect(types.parenL);
-  if (this.type === types.semi) {
-    if (awaitAt > -1) { this.unexpected(awaitAt); }
-    return this.parseFor(node, null)
-  }
-  var isLet = this.isLet();
-  if (this.type === types._var || this.type === types._const || isLet) {
-    var init$1 = this.startNode(), kind = isLet ? "let" : this.value;
-    this.next();
-    this.parseVar(init$1, true, kind);
-    this.finishNode(init$1, "VariableDeclaration");
-    if ((this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) && init$1.declarations.length === 1 &&
-        !(kind !== "var" && init$1.declarations[0].init)) {
-      if (this.options.ecmaVersion >= 9) {
-        if (this.type === types._in) {
-          if (awaitAt > -1) { this.unexpected(awaitAt); }
-        } else { node.await = awaitAt > -1; }
-      }
-      return this.parseForIn(node, init$1)
-    }
-    if (awaitAt > -1) { this.unexpected(awaitAt); }
-    return this.parseFor(node, init$1)
-  }
-  var refDestructuringErrors = new DestructuringErrors;
-  var init = this.parseExpression(true, refDestructuringErrors);
-  if (this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
-    if (this.options.ecmaVersion >= 9) {
-      if (this.type === types._in) {
-        if (awaitAt > -1) { this.unexpected(awaitAt); }
-      } else { node.await = awaitAt > -1; }
-    }
-    this.toAssignable(init, false, refDestructuringErrors);
-    this.checkLVal(init);
-    return this.parseForIn(node, init)
-  } else {
-    this.checkExpressionErrors(refDestructuringErrors, true);
-  }
-  if (awaitAt > -1) { this.unexpected(awaitAt); }
-  return this.parseFor(node, init)
-};
-
-pp$1.parseFunctionStatement = function(node, isAsync, declarationPosition) {
-  this.next();
-  return this.parseFunction(node, FUNC_STATEMENT | (declarationPosition ? 0 : FUNC_HANGING_STATEMENT), false, isAsync)
-};
-
-pp$1.parseIfStatement = function(node) {
-  this.next();
-  node.test = this.parseParenExpression();
-  // allow function declarations in branches, but only in non-strict mode
-  node.consequent = this.parseStatement("if");
-  node.alternate = this.eat(types._else) ? this.parseStatement("if") : null;
-  return this.finishNode(node, "IfStatement")
-};
-
-pp$1.parseReturnStatement = function(node) {
-  if (!this.inFunction && !this.options.allowReturnOutsideFunction)
-    { this.raise(this.start, "'return' outside of function"); }
-  this.next();
-
-  // In `return` (and `break`/`continue`), the keywords with
-  // optional arguments, we eagerly look for a semicolon or the
-  // possibility to insert one.
-
-  if (this.eat(types.semi) || this.insertSemicolon()) { node.argument = null; }
-  else { node.argument = this.parseExpression(); this.semicolon(); }
-  return this.finishNode(node, "ReturnStatement")
-};
-
-pp$1.parseSwitchStatement = function(node) {
-  var this$1 = this;
-
-  this.next();
-  node.discriminant = this.parseParenExpression();
-  node.cases = [];
-  this.expect(types.braceL);
-  this.labels.push(switchLabel);
-  this.enterScope(0);
-
-  // Statements under must be grouped (by label) in SwitchCase
-  // nodes. `cur` is used to keep the node that we are currently
-  // adding statements to.
-
-  var cur;
-  for (var sawDefault = false; this.type !== types.braceR;) {
-    if (this$1.type === types._case || this$1.type === types._default) {
-      var isCase = this$1.type === types._case;
-      if (cur) { this$1.finishNode(cur, "SwitchCase"); }
-      node.cases.push(cur = this$1.startNode());
-      cur.consequent = [];
-      this$1.next();
-      if (isCase) {
-        cur.test = this$1.parseExpression();
-      } else {
-        if (sawDefault) { this$1.raiseRecoverable(this$1.lastTokStart, "Multiple default clauses"); }
-        sawDefault = true;
-        cur.test = null;
-      }
-      this$1.expect(types.colon);
-    } else {
-      if (!cur) { this$1.unexpected(); }
-      cur.consequent.push(this$1.parseStatement(null));
-    }
-  }
-  this.exitScope();
-  if (cur) { this.finishNode(cur, "SwitchCase"); }
-  this.next(); // Closing brace
-  this.labels.pop();
-  return this.finishNode(node, "SwitchStatement")
-};
-
-pp$1.parseThrowStatement = function(node) {
-  this.next();
-  if (lineBreak.test(this.input.slice(this.lastTokEnd, this.start)))
-    { this.raise(this.lastTokEnd, "Illegal newline after throw"); }
-  node.argument = this.parseExpression();
-  this.semicolon();
-  return this.finishNode(node, "ThrowStatement")
-};
-
-// Reused empty array added for node fields that are always empty.
-
-var empty = [];
-
-pp$1.parseTryStatement = function(node) {
-  this.next();
-  node.block = this.parseBlock();
-  node.handler = null;
-  if (this.type === types._catch) {
-    var clause = this.startNode();
-    this.next();
-    if (this.eat(types.parenL)) {
-      clause.param = this.parseBindingAtom();
-      var simple = clause.param.type === "Identifier";
-      this.enterScope(simple ? SCOPE_SIMPLE_CATCH : 0);
-      this.checkLVal(clause.param, simple ? BIND_SIMPLE_CATCH : BIND_LEXICAL);
-      this.expect(types.parenR);
-    } else {
-      if (this.options.ecmaVersion < 10) { this.unexpected(); }
-      clause.param = null;
-      this.enterScope(0);
-    }
-    clause.body = this.parseBlock(false);
-    this.exitScope();
-    node.handler = this.finishNode(clause, "CatchClause");
-  }
-  node.finalizer = this.eat(types._finally) ? this.parseBlock() : null;
-  if (!node.handler && !node.finalizer)
-    { this.raise(node.start, "Missing catch or finally clause"); }
-  return this.finishNode(node, "TryStatement")
-};
-
-pp$1.parseVarStatement = function(node, kind) {
-  this.next();
-  this.parseVar(node, false, kind);
-  this.semicolon();
-  return this.finishNode(node, "VariableDeclaration")
-};
-
-pp$1.parseWhileStatement = function(node) {
-  this.next();
-  node.test = this.parseParenExpression();
-  this.labels.push(loopLabel);
-  node.body = this.parseStatement("while");
-  this.labels.pop();
-  return this.finishNode(node, "WhileStatement")
-};
-
-pp$1.parseWithStatement = function(node) {
-  if (this.strict) { this.raise(this.start, "'with' in strict mode"); }
-  this.next();
-  node.object = this.parseParenExpression();
-  node.body = this.parseStatement("with");
-  return this.finishNode(node, "WithStatement")
-};
-
-pp$1.parseEmptyStatement = function(node) {
-  this.next();
-  return this.finishNode(node, "EmptyStatement")
-};
-
-pp$1.parseLabeledStatement = function(node, maybeName, expr, context) {
-  var this$1 = this;
-
-  for (var i$1 = 0, list = this$1.labels; i$1 < list.length; i$1 += 1)
-    {
-    var label = list[i$1];
-
-    if (label.name === maybeName)
-      { this$1.raise(expr.start, "Label '" + maybeName + "' is already declared");
-  } }
-  var kind = this.type.isLoop ? "loop" : this.type === types._switch ? "switch" : null;
-  for (var i = this.labels.length - 1; i >= 0; i--) {
-    var label$1 = this$1.labels[i];
-    if (label$1.statementStart === node.start) {
-      // Update information about previous labels on this node
-      label$1.statementStart = this$1.start;
-      label$1.kind = kind;
-    } else { break }
-  }
-  this.labels.push({name: maybeName, kind: kind, statementStart: this.start});
-  node.body = this.parseStatement(context ? context.indexOf("label") === -1 ? context + "label" : context : "label");
-  this.labels.pop();
-  node.label = expr;
-  return this.finishNode(node, "LabeledStatement")
-};
-
-pp$1.parseExpressionStatement = function(node, expr) {
-  node.expression = expr;
-  this.semicolon();
-  return this.finishNode(node, "ExpressionStatement")
-};
-
-// Parse a semicolon-enclosed block of statements, handling `"use
-// strict"` declarations when `allowStrict` is true (used for
-// function bodies).
-
-pp$1.parseBlock = function(createNewLexicalScope, node) {
-  var this$1 = this;
-  if ( createNewLexicalScope === void 0 ) createNewLexicalScope = true;
-  if ( node === void 0 ) node = this.startNode();
-
-  node.body = [];
-  this.expect(types.braceL);
-  if (createNewLexicalScope) { this.enterScope(0); }
-  while (!this.eat(types.braceR)) {
-    var stmt = this$1.parseStatement(null);
-    node.body.push(stmt);
-  }
-  if (createNewLexicalScope) { this.exitScope(); }
-  return this.finishNode(node, "BlockStatement")
-};
-
-// Parse a regular `for` loop. The disambiguation code in
-// `parseStatement` will already have parsed the init statement or
-// expression.
-
-pp$1.parseFor = function(node, init) {
-  node.init = init;
-  this.expect(types.semi);
-  node.test = this.type === types.semi ? null : this.parseExpression();
-  this.expect(types.semi);
-  node.update = this.type === types.parenR ? null : this.parseExpression();
-  this.expect(types.parenR);
-  node.body = this.parseStatement("for");
-  this.exitScope();
-  this.labels.pop();
-  return this.finishNode(node, "ForStatement")
-};
-
-// Parse a `for`/`in` and `for`/`of` loop, which are almost
-// same from parser's perspective.
-
-pp$1.parseForIn = function(node, init) {
-  var type = this.type === types._in ? "ForInStatement" : "ForOfStatement";
-  this.next();
-  if (type === "ForInStatement") {
-    if (init.type === "AssignmentPattern" ||
-      (init.type === "VariableDeclaration" && init.declarations[0].init != null &&
-       (this.strict || init.declarations[0].id.type !== "Identifier")))
-      { this.raise(init.start, "Invalid assignment in for-in loop head"); }
-  }
-  node.left = init;
-  node.right = type === "ForInStatement" ? this.parseExpression() : this.parseMaybeAssign();
-  this.expect(types.parenR);
-  node.body = this.parseStatement("for");
-  this.exitScope();
-  this.labels.pop();
-  return this.finishNode(node, type)
-};
-
-// Parse a list of variable declarations.
-
-pp$1.parseVar = function(node, isFor, kind) {
-  var this$1 = this;
-
-  node.declarations = [];
-  node.kind = kind;
-  for (;;) {
-    var decl = this$1.startNode();
-    this$1.parseVarId(decl, kind);
-    if (this$1.eat(types.eq)) {
-      decl.init = this$1.parseMaybeAssign(isFor);
-    } else if (kind === "const" && !(this$1.type === types._in || (this$1.options.ecmaVersion >= 6 && this$1.isContextual("of")))) {
-      this$1.unexpected();
-    } else if (decl.id.type !== "Identifier" && !(isFor && (this$1.type === types._in || this$1.isContextual("of")))) {
-      this$1.raise(this$1.lastTokEnd, "Complex binding patterns require an initialization value");
-    } else {
-      decl.init = null;
-    }
-    node.declarations.push(this$1.finishNode(decl, "VariableDeclarator"));
-    if (!this$1.eat(types.comma)) { break }
-  }
-  return node
-};
+  // All token type variables start with an underscore, to make them
+  // easy to recognize.
 
-pp$1.parseVarId = function(decl, kind) {
-  if ((kind === "const" || kind === "let") && this.isContextual("let")) {
-    this.raiseRecoverable(this.start, "let is disallowed as a lexically bound name");
-  }
-  decl.id = this.parseBindingAtom();
-  this.checkLVal(decl.id, kind === "var" ? BIND_VAR : BIND_LEXICAL, false);
-};
-
-var FUNC_STATEMENT = 1;
-var FUNC_HANGING_STATEMENT = 2;
-var FUNC_NULLABLE_ID = 4;
-
-// Parse a function declaration or literal (depending on the
-// `statement & FUNC_STATEMENT`).
-
-// Remove `allowExpressionBody` for 7.0.0, as it is only called with false
-pp$1.parseFunction = function(node, statement, allowExpressionBody, isAsync) {
-  this.initFunction(node);
-  if (this.options.ecmaVersion >= 9 || this.options.ecmaVersion >= 6 && !isAsync) {
-    if (this.type === types.star && (statement & FUNC_HANGING_STATEMENT))
-      { this.unexpected(); }
-    node.generator = this.eat(types.star);
-  }
-  if (this.options.ecmaVersion >= 8)
-    { node.async = !!isAsync; }
-
-  if (statement & FUNC_STATEMENT) {
-    node.id = (statement & FUNC_NULLABLE_ID) && this.type !== types.name ? null : this.parseIdent();
-    if (node.id && !(statement & FUNC_HANGING_STATEMENT))
-      // If it is a regular function declaration in sloppy mode, then it is
-      // subject to Annex B semantics (BIND_FUNCTION). Otherwise, the binding
-      // mode depends on properties of the current scope (see
-      // treatFunctionsAsVar).
-      { this.checkLVal(node.id, (this.strict || node.generator || node.async) ? this.treatFunctionsAsVar ? BIND_VAR : BIND_LEXICAL : BIND_FUNCTION); }
-  }
+  // The `beforeExpr` property is used to disambiguate between regular
+  // expressions and divisions. It is set on all token types that can
+  // be followed by an expression (thus, a slash after them would be a
+  // regular expression).
+  //
+  // The `startsExpr` property is used to check if the token ends a
+  // `yield` expression. It is set on all token types that either can
+  // directly start an expression (like a quotation mark) or can
+  // continue an expression (like the body of a string).
+  //
+  // `isLoop` marks a keyword as starting a loop, which is important
+  // to know when parsing a label, in order to allow or disallow
+  // continue jumps to that label.
+
+  var TokenType = function TokenType(label, conf) {
+    if ( conf === void 0 ) conf = {};
+
+    this.label = label;
+    this.keyword = conf.keyword;
+    this.beforeExpr = !!conf.beforeExpr;
+    this.startsExpr = !!conf.startsExpr;
+    this.isLoop = !!conf.isLoop;
+    this.isAssign = !!conf.isAssign;
+    this.prefix = !!conf.prefix;
+    this.postfix = !!conf.postfix;
+    this.binop = conf.binop || null;
+    this.updateContext = null;
+  };
 
-  var oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
-  this.yieldPos = 0;
-  this.awaitPos = 0;
-  this.awaitIdentPos = 0;
-  this.enterScope(functionFlags(node.async, node.generator));
-
-  if (!(statement & FUNC_STATEMENT))
-    { node.id = this.type === types.name ? this.parseIdent() : null; }
-
-  this.parseFunctionParams(node);
-  this.parseFunctionBody(node, allowExpressionBody, false);
-
-  this.yieldPos = oldYieldPos;
-  this.awaitPos = oldAwaitPos;
-  this.awaitIdentPos = oldAwaitIdentPos;
-  return this.finishNode(node, (statement & FUNC_STATEMENT) ? "FunctionDeclaration" : "FunctionExpression")
-};
-
-pp$1.parseFunctionParams = function(node) {
-  this.expect(types.parenL);
-  node.params = this.parseBindingList(types.parenR, false, this.options.ecmaVersion >= 8);
-  this.checkYieldAwaitInDefaultParams();
-};
-
-// Parse a class declaration or literal (depending on the
-// `isStatement` parameter).
-
-pp$1.parseClass = function(node, isStatement) {
-  var this$1 = this;
-
-  this.next();
-
-  // ecma-262 14.6 Class Definitions
-  // A class definition is always strict mode code.
-  var oldStrict = this.strict;
-  this.strict = true;
-
-  this.parseClassId(node, isStatement);
-  this.parseClassSuper(node);
-  var classBody = this.startNode();
-  var hadConstructor = false;
-  classBody.body = [];
-  this.expect(types.braceL);
-  while (!this.eat(types.braceR)) {
-    var element = this$1.parseClassElement(node.superClass !== null);
-    if (element) {
-      classBody.body.push(element);
-      if (element.type === "MethodDefinition" && element.kind === "constructor") {
-        if (hadConstructor) { this$1.raise(element.start, "Duplicate constructor in the same class"); }
-        hadConstructor = true;
-      }
-    }
-  }
-  node.body = this.finishNode(classBody, "ClassBody");
-  this.strict = oldStrict;
-  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression")
-};
-
-pp$1.parseClassElement = function(constructorAllowsSuper) {
-  var this$1 = this;
-
-  if (this.eat(types.semi)) { return null }
-
-  var method = this.startNode();
-  var tryContextual = function (k, noLineBreak) {
-    if ( noLineBreak === void 0 ) noLineBreak = false;
-
-    var start = this$1.start, startLoc = this$1.startLoc;
-    if (!this$1.eatContextual(k)) { return false }
-    if (this$1.type !== types.parenL && (!noLineBreak || !this$1.canInsertSemicolon())) { return true }
-    if (method.key) { this$1.unexpected(); }
-    method.computed = false;
-    method.key = this$1.startNodeAt(start, startLoc);
-    method.key.name = k;
-    this$1.finishNode(method.key, "Identifier");
-    return false
+  function binop(name, prec) {
+    return new TokenType(name, {beforeExpr: true, binop: prec})
+  }
+  var beforeExpr = {beforeExpr: true}, startsExpr = {startsExpr: true};
+
+  // Map keyword names to token types.
+
+  var keywords$1 = {};
+
+  // Succinct definitions of keyword token types
+  function kw(name, options) {
+    if ( options === void 0 ) options = {};
+
+    options.keyword = name;
+    return keywords$1[name] = new TokenType(name, options)
+  }
+
+  var types = {
+    num: new TokenType("num", startsExpr),
+    regexp: new TokenType("regexp", startsExpr),
+    string: new TokenType("string", startsExpr),
+    name: new TokenType("name", startsExpr),
+    eof: new TokenType("eof"),
+
+    // Punctuation token types.
+    bracketL: new TokenType("[", {beforeExpr: true, startsExpr: true}),
+    bracketR: new TokenType("]"),
+    braceL: new TokenType("{", {beforeExpr: true, startsExpr: true}),
+    braceR: new TokenType("}"),
+    parenL: new TokenType("(", {beforeExpr: true, startsExpr: true}),
+    parenR: new TokenType(")"),
+    comma: new TokenType(",", beforeExpr),
+    semi: new TokenType(";", beforeExpr),
+    colon: new TokenType(":", beforeExpr),
+    dot: new TokenType("."),
+    question: new TokenType("?", beforeExpr),
+    arrow: new TokenType("=>", beforeExpr),
+    template: new TokenType("template"),
+    invalidTemplate: new TokenType("invalidTemplate"),
+    ellipsis: new TokenType("...", beforeExpr),
+    backQuote: new TokenType("`", startsExpr),
+    dollarBraceL: new TokenType("${", {beforeExpr: true, startsExpr: true}),
+
+    // Operators. These carry several kinds of properties to help the
+    // parser use them properly (the presence of these properties is
+    // what categorizes them as operators).
+    //
+    // `binop`, when present, specifies that this operator is a binary
+    // operator, and will refer to its precedence.
+    //
+    // `prefix` and `postfix` mark the operator as a prefix or postfix
+    // unary operator.
+    //
+    // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as
+    // binary operators with a very low precedence, that should result
+    // in AssignmentExpression nodes.
+
+    eq: new TokenType("=", {beforeExpr: true, isAssign: true}),
+    assign: new TokenType("_=", {beforeExpr: true, isAssign: true}),
+    incDec: new TokenType("++/--", {prefix: true, postfix: true, startsExpr: true}),
+    prefix: new TokenType("!/~", {beforeExpr: true, prefix: true, startsExpr: true}),
+    logicalOR: binop("||", 1),
+    logicalAND: binop("&&", 2),
+    bitwiseOR: binop("|", 3),
+    bitwiseXOR: binop("^", 4),
+    bitwiseAND: binop("&", 5),
+    equality: binop("==/!=/===/!==", 6),
+    relational: binop("</>/<=/>=", 7),
+    bitShift: binop("<</>>/>>>", 8),
+    plusMin: new TokenType("+/-", {beforeExpr: true, binop: 9, prefix: true, startsExpr: true}),
+    modulo: binop("%", 10),
+    star: binop("*", 10),
+    slash: binop("/", 10),
+    starstar: new TokenType("**", {beforeExpr: true}),
+
+    // Keyword token types.
+    _break: kw("break"),
+    _case: kw("case", beforeExpr),
+    _catch: kw("catch"),
+    _continue: kw("continue"),
+    _debugger: kw("debugger"),
+    _default: kw("default", beforeExpr),
+    _do: kw("do", {isLoop: true, beforeExpr: true}),
+    _else: kw("else", beforeExpr),
+    _finally: kw("finally"),
+    _for: kw("for", {isLoop: true}),
+    _function: kw("function", startsExpr),
+    _if: kw("if"),
+    _return: kw("return", beforeExpr),
+    _switch: kw("switch"),
+    _throw: kw("throw", beforeExpr),
+    _try: kw("try"),
+    _var: kw("var"),
+    _const: kw("const"),
+    _while: kw("while", {isLoop: true}),
+    _with: kw("with"),
+    _new: kw("new", {beforeExpr: true, startsExpr: true}),
+    _this: kw("this", startsExpr),
+    _super: kw("super", startsExpr),
+    _class: kw("class", startsExpr),
+    _extends: kw("extends", beforeExpr),
+    _export: kw("export"),
+    _import: kw("import", startsExpr),
+    _null: kw("null", startsExpr),
+    _true: kw("true", startsExpr),
+    _false: kw("false", startsExpr),
+    _in: kw("in", {beforeExpr: true, binop: 7}),
+    _instanceof: kw("instanceof", {beforeExpr: true, binop: 7}),
+    _typeof: kw("typeof", {beforeExpr: true, prefix: true, startsExpr: true}),
+    _void: kw("void", {beforeExpr: true, prefix: true, startsExpr: true}),
+    _delete: kw("delete", {beforeExpr: true, prefix: true, startsExpr: true})
   };
 
-  method.kind = "method";
-  method.static = tryContextual("static");
-  var isGenerator = this.eat(types.star);
-  var isAsync = false;
-  if (!isGenerator) {
-    if (this.options.ecmaVersion >= 8 && tryContextual("async", true)) {
-      isAsync = true;
-      isGenerator = this.options.ecmaVersion >= 9 && this.eat(types.star);
-    } else if (tryContextual("get")) {
-      method.kind = "get";
-    } else if (tryContextual("set")) {
-      method.kind = "set";
-    }
-  }
-  if (!method.key) { this.parsePropertyName(method); }
-  var key = method.key;
-  var allowsDirectSuper = false;
-  if (!method.computed && !method.static && (key.type === "Identifier" && key.name === "constructor" ||
-      key.type === "Literal" && key.value === "constructor")) {
-    if (method.kind !== "method") { this.raise(key.start, "Constructor can't have get/set modifier"); }
-    if (isGenerator) { this.raise(key.start, "Constructor can't be a generator"); }
-    if (isAsync) { this.raise(key.start, "Constructor can't be an async method"); }
-    method.kind = "constructor";
-    allowsDirectSuper = constructorAllowsSuper;
-  } else if (method.static && key.type === "Identifier" && key.name === "prototype") {
-    this.raise(key.start, "Classes may not have a static property named prototype");
-  }
-  this.parseClassMethod(method, isGenerator, isAsync, allowsDirectSuper);
-  if (method.kind === "get" && method.value.params.length !== 0)
-    { this.raiseRecoverable(method.value.start, "getter should have no params"); }
-  if (method.kind === "set" && method.value.params.length !== 1)
-    { this.raiseRecoverable(method.value.start, "setter should have exactly one param"); }
-  if (method.kind === "set" && method.value.params[0].type === "RestElement")
-    { this.raiseRecoverable(method.value.params[0].start, "Setter cannot use rest params"); }
-  return method
-};
-
-pp$1.parseClassMethod = function(method, isGenerator, isAsync, allowsDirectSuper) {
-  method.value = this.parseMethod(isGenerator, isAsync, allowsDirectSuper);
-  return this.finishNode(method, "MethodDefinition")
-};
-
-pp$1.parseClassId = function(node, isStatement) {
-  if (this.type === types.name) {
-    node.id = this.parseIdent();
-    if (isStatement === true)
-      { this.checkLVal(node.id, BIND_LEXICAL, false); }
-  } else {
-    if (isStatement === true)
-      { this.unexpected(); }
-    node.id = null;
-  }
-};
+  // Matches a whole line break (where CRLF is considered a single
+  // line break). Used to count lines.
 
-pp$1.parseClassSuper = function(node) {
-  node.superClass = this.eat(types._extends) ? this.parseExprSubscripts() : null;
-};
+  var lineBreak = /\r\n?|\n|\u2028|\u2029/;
+  var lineBreakG = new RegExp(lineBreak.source, "g");
 
-// Parses module export declaration.
+  function isNewLine(code, ecma2019String) {
+    return code === 10 || code === 13 || (!ecma2019String && (code === 0x2028 || code === 0x2029))
+  }
 
-pp$1.parseExport = function(node, exports) {
-  var this$1 = this;
+  var nonASCIIwhitespace = /[\u1680\u2000-\u200a\u202f\u205f\u3000\ufeff]/;
 
-  this.next();
-  // export * from '...'
-  if (this.eat(types.star)) {
-    this.expectContextual("from");
-    if (this.type !== types.string) { this.unexpected(); }
-    node.source = this.parseExprAtom();
-    this.semicolon();
-    return this.finishNode(node, "ExportAllDeclaration")
-  }
-  if (this.eat(types._default)) { // export default ...
-    this.checkExport(exports, "default", this.lastTokStart);
-    var isAsync;
-    if (this.type === types._function || (isAsync = this.isAsyncFunction())) {
-      var fNode = this.startNode();
-      this.next();
-      if (isAsync) { this.next(); }
-      node.declaration = this.parseFunction(fNode, FUNC_STATEMENT | FUNC_NULLABLE_ID, false, isAsync);
-    } else if (this.type === types._class) {
-      var cNode = this.startNode();
-      node.declaration = this.parseClass(cNode, "nullableID");
-    } else {
-      node.declaration = this.parseMaybeAssign();
-      this.semicolon();
-    }
-    return this.finishNode(node, "ExportDefaultDeclaration")
-  }
-  // export var|const|let|function|class ...
-  if (this.shouldParseExportStatement()) {
-    node.declaration = this.parseStatement(null);
-    if (node.declaration.type === "VariableDeclaration")
-      { this.checkVariableExport(exports, node.declaration.declarations); }
-    else
-      { this.checkExport(exports, node.declaration.id.name, node.declaration.id.start); }
-    node.specifiers = [];
-    node.source = null;
-  } else { // export { x, y as z } [from '...']
-    node.declaration = null;
-    node.specifiers = this.parseExportSpecifiers(exports);
-    if (this.eatContextual("from")) {
-      if (this.type !== types.string) { this.unexpected(); }
-      node.source = this.parseExprAtom();
-    } else {
-      for (var i = 0, list = node.specifiers; i < list.length; i += 1) {
-        // check for keywords used as local names
-        var spec = list[i];
+  var skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g;
 
-        this$1.checkUnreserved(spec.local);
-        // check if export is defined
-        this$1.checkLocalExport(spec.local);
-      }
+  var ref = Object.prototype;
+  var hasOwnProperty = ref.hasOwnProperty;
+  var toString = ref.toString;
 
-      node.source = null;
-    }
-    this.semicolon();
+  // Checks if an object has a property.
+
+  function has(obj, propName) {
+    return hasOwnProperty.call(obj, propName)
   }
-  return this.finishNode(node, "ExportNamedDeclaration")
-};
-
-pp$1.checkExport = function(exports, name, pos) {
-  if (!exports) { return }
-  if (has(exports, name))
-    { this.raiseRecoverable(pos, "Duplicate export '" + name + "'"); }
-  exports[name] = true;
-};
-
-pp$1.checkPatternExport = function(exports, pat) {
-  var this$1 = this;
-
-  var type = pat.type;
-  if (type === "Identifier")
-    { this.checkExport(exports, pat.name, pat.start); }
-  else if (type === "ObjectPattern")
-    { for (var i = 0, list = pat.properties; i < list.length; i += 1)
-      {
-        var prop = list[i];
 
-        this$1.checkPatternExport(exports, prop);
-      } }
-  else if (type === "ArrayPattern")
-    { for (var i$1 = 0, list$1 = pat.elements; i$1 < list$1.length; i$1 += 1) {
-      var elt = list$1[i$1];
+  var isArray = Array.isArray || (function (obj) { return (
+    toString.call(obj) === "[object Array]"
+  ); });
 
-        if (elt) { this$1.checkPatternExport(exports, elt); }
-    } }
-  else if (type === "Property")
-    { this.checkPatternExport(exports, pat.value); }
-  else if (type === "AssignmentPattern")
-    { this.checkPatternExport(exports, pat.left); }
-  else if (type === "RestElement")
-    { this.checkPatternExport(exports, pat.argument); }
-  else if (type === "ParenthesizedExpression")
-    { this.checkPatternExport(exports, pat.expression); }
-};
-
-pp$1.checkVariableExport = function(exports, decls) {
-  var this$1 = this;
-
-  if (!exports) { return }
-  for (var i = 0, list = decls; i < list.length; i += 1)
-    {
-    var decl = list[i];
-
-    this$1.checkPatternExport(exports, decl.id);
-  }
-};
-
-pp$1.shouldParseExportStatement = function() {
-  return this.type.keyword === "var" ||
-    this.type.keyword === "const" ||
-    this.type.keyword === "class" ||
-    this.type.keyword === "function" ||
-    this.isLet() ||
-    this.isAsyncFunction()
-};
-
-// Parses a comma-separated list of module exports.
-
-pp$1.parseExportSpecifiers = function(exports) {
-  var this$1 = this;
-
-  var nodes = [], first = true;
-  // export { x, y as z } [from '...']
-  this.expect(types.braceL);
-  while (!this.eat(types.braceR)) {
-    if (!first) {
-      this$1.expect(types.comma);
-      if (this$1.afterTrailingComma(types.braceR)) { break }
-    } else { first = false; }
-
-    var node = this$1.startNode();
-    node.local = this$1.parseIdent(true);
-    node.exported = this$1.eatContextual("as") ? this$1.parseIdent(true) : node.local;
-    this$1.checkExport(exports, node.exported.name, node.exported.start);
-    nodes.push(this$1.finishNode(node, "ExportSpecifier"));
+  function wordsRegexp(words) {
+    return new RegExp("^(?:" + words.replace(/ /g, "|") + ")$")
   }
-  return nodes
-};
-
-// Parses import declaration.
-
-pp$1.parseImport = function(node) {
-  this.next();
-  // import '...'
-  if (this.type === types.string) {
-    node.specifiers = empty;
-    node.source = this.parseExprAtom();
-  } else {
-    node.specifiers = this.parseImportSpecifiers();
-    this.expectContextual("from");
-    node.source = this.type === types.string ? this.parseExprAtom() : this.unexpected();
-  }
-  this.semicolon();
-  return this.finishNode(node, "ImportDeclaration")
-};
-
-// Parses a comma-separated list of module imports.
 
-pp$1.parseImportSpecifiers = function() {
-  var this$1 = this;
+  // These are used when `options.locations` is on, for the
+  // `startLoc` and `endLoc` properties.
 
-  var nodes = [], first = true;
-  if (this.type === types.name) {
-    // import defaultObj, { x, y as z } from '...'
-    var node = this.startNode();
-    node.local = this.parseIdent();
-    this.checkLVal(node.local, BIND_LEXICAL);
-    nodes.push(this.finishNode(node, "ImportDefaultSpecifier"));
-    if (!this.eat(types.comma)) { return nodes }
-  }
-  if (this.type === types.star) {
-    var node$1 = this.startNode();
-    this.next();
-    this.expectContextual("as");
-    node$1.local = this.parseIdent();
-    this.checkLVal(node$1.local, BIND_LEXICAL);
-    nodes.push(this.finishNode(node$1, "ImportNamespaceSpecifier"));
-    return nodes
-  }
-  this.expect(types.braceL);
-  while (!this.eat(types.braceR)) {
-    if (!first) {
-      this$1.expect(types.comma);
-      if (this$1.afterTrailingComma(types.braceR)) { break }
-    } else { first = false; }
-
-    var node$2 = this$1.startNode();
-    node$2.imported = this$1.parseIdent(true);
-    if (this$1.eatContextual("as")) {
-      node$2.local = this$1.parseIdent();
-    } else {
-      this$1.checkUnreserved(node$2.imported);
-      node$2.local = node$2.imported;
-    }
-    this$1.checkLVal(node$2.local, BIND_LEXICAL);
-    nodes.push(this$1.finishNode(node$2, "ImportSpecifier"));
-  }
-  return nodes
-};
+  var Position = function Position(line, col) {
+    this.line = line;
+    this.column = col;
+  };
 
-// Set `ExpressionStatement#directive` property for directive prologues.
-pp$1.adaptDirectivePrologue = function(statements) {
-  for (var i = 0; i < statements.length && this.isDirectiveCandidate(statements[i]); ++i) {
-    statements[i].directive = statements[i].expression.raw.slice(1, -1);
-  }
-};
-pp$1.isDirectiveCandidate = function(statement) {
-  return (
-    statement.type === "ExpressionStatement" &&
-    statement.expression.type === "Literal" &&
-    typeof statement.expression.value === "string" &&
-    // Reject parenthesized strings.
-    (this.input[statement.start] === "\"" || this.input[statement.start] === "'")
-  )
-};
-
-var pp$2 = Parser.prototype;
-
-// Convert existing expression atom to assignable pattern
-// if possible.
-
-pp$2.toAssignable = function(node, isBinding, refDestructuringErrors) {
-  var this$1 = this;
-
-  if (this.options.ecmaVersion >= 6 && node) {
-    switch (node.type) {
-    case "Identifier":
-      if (this.inAsync && node.name === "await")
-        { this.raise(node.start, "Cannot use 'await' as identifier inside an async function"); }
-      break
+  Position.prototype.offset = function offset (n) {
+    return new Position(this.line, this.column + n)
+  };
 
-    case "ObjectPattern":
-    case "ArrayPattern":
-    case "RestElement":
-      break
+  var SourceLocation = function SourceLocation(p, start, end) {
+    this.start = start;
+    this.end = end;
+    if (p.sourceFile !== null) { this.source = p.sourceFile; }
+  };
 
-    case "ObjectExpression":
-      node.type = "ObjectPattern";
-      if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
-      for (var i = 0, list = node.properties; i < list.length; i += 1) {
-        var prop = list[i];
-
-      this$1.toAssignable(prop, isBinding);
-        // Early error:
-        //   AssignmentRestProperty[Yield, Await] :
-        //     `...` DestructuringAssignmentTarget[Yield, Await]
-        //
-        //   It is a Syntax Error if |DestructuringAssignmentTarget| is an |ArrayLiteral| or an |ObjectLiteral|.
-        if (
-          prop.type === "RestElement" &&
-          (prop.argument.type === "ArrayPattern" || prop.argument.type === "ObjectPattern")
-        ) {
-          this$1.raise(prop.argument.start, "Unexpected token");
-        }
+  // The `getLineInfo` function is mostly useful when the
+  // `locations` option is off (for performance reasons) and you
+  // want to find the line/column position for a given character
+  // offset. `input` should be the code string that the offset refers
+  // into.
+
+  function getLineInfo(input, offset) {
+    for (var line = 1, cur = 0;;) {
+      lineBreakG.lastIndex = cur;
+      var match = lineBreakG.exec(input);
+      if (match && match.index < offset) {
+        ++line;
+        cur = match.index + match[0].length;
+      } else {
+        return new Position(line, offset - cur)
       }
-      break
+    }
+  }
 
-    case "Property":
-      // AssignmentProperty has type === "Property"
-      if (node.kind !== "init") { this.raise(node.key.start, "Object pattern can't contain getter or setter"); }
-      this.toAssignable(node.value, isBinding);
-      break
+  // A second optional argument can be given to further configure
+  // the parser process. These options are recognized:
+
+  var defaultOptions = {
+    // `ecmaVersion` indicates the ECMAScript version to parse. Must be
+    // either 3, 5, 6 (2015), 7 (2016), 8 (2017), 9 (2018), or 10
+    // (2019). This influences support for strict mode, the set of
+    // reserved words, and support for new syntax features. The default
+    // is 9.
+    ecmaVersion: 9,
+    // `sourceType` indicates the mode the code should be parsed in.
+    // Can be either `"script"` or `"module"`. This influences global
+    // strict mode and parsing of `import` and `export` declarations.
+    sourceType: "script",
+    // `onInsertedSemicolon` can be a callback that will be called
+    // when a semicolon is automatically inserted. It will be passed
+    // the position of the comma as an offset, and if `locations` is
+    // enabled, it is given the location as a `{line, column}` object
+    // as second argument.
+    onInsertedSemicolon: null,
+    // `onTrailingComma` is similar to `onInsertedSemicolon`, but for
+    // trailing commas.
+    onTrailingComma: null,
+    // By default, reserved words are only enforced if ecmaVersion >= 5.
+    // Set `allowReserved` to a boolean value to explicitly turn this on
+    // an off. When this option has the value "never", reserved words
+    // and keywords can also not be used as property names.
+    allowReserved: null,
+    // When enabled, a return at the top level is not considered an
+    // error.
+    allowReturnOutsideFunction: false,
+    // When enabled, import/export statements are not constrained to
+    // appearing at the top of the program.
+    allowImportExportEverywhere: false,
+    // When enabled, await identifiers are allowed to appear at the top-level scope,
+    // but they are still not allowed in non-async functions.
+    allowAwaitOutsideFunction: false,
+    // When enabled, hashbang directive in the beginning of file
+    // is allowed and treated as a line comment.
+    allowHashBang: false,
+    // When `locations` is on, `loc` properties holding objects with
+    // `start` and `end` properties in `{line, column}` form (with
+    // line being 1-based and column 0-based) will be attached to the
+    // nodes.
+    locations: false,
+    // A function can be passed as `onToken` option, which will
+    // cause Acorn to call that function with object in the same
+    // format as tokens returned from `tokenizer().getToken()`. Note
+    // that you are not allowed to call the parser from the
+    // callback—that will corrupt its internal state.
+    onToken: null,
+    // A function can be passed as `onComment` option, which will
+    // cause Acorn to call that function with `(block, text, start,
+    // end)` parameters whenever a comment is skipped. `block` is a
+    // boolean indicating whether this is a block (`/* */`) comment,
+    // `text` is the content of the comment, and `start` and `end` are
+    // character offsets that denote the start and end of the comment.
+    // When the `locations` option is on, two more parameters are
+    // passed, the full `{line, column}` locations of the start and
+    // end of the comments. Note that you are not allowed to call the
+    // parser from the callback—that will corrupt its internal state.
+    onComment: null,
+    // Nodes have their start and end characters offsets recorded in
+    // `start` and `end` properties (directly on the node, rather than
+    // the `loc` object, which holds line/column data. To also add a
+    // [semi-standardized][range] `range` property holding a `[start,
+    // end]` array with the same numbers, set the `ranges` option to
+    // `true`.
+    //
+    // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
+    ranges: false,
+    // It is possible to parse multiple files into a single AST by
+    // passing the tree produced by parsing the first file as
+    // `program` option in subsequent parses. This will add the
+    // toplevel forms of the parsed file to the `Program` (top) node
+    // of an existing parse tree.
+    program: null,
+    // When `locations` is on, you can pass this to record the source
+    // file in every node's `loc` object.
+    sourceFile: null,
+    // This value, if given, is stored in every node, whether
+    // `locations` is on or off.
+    directSourceFile: null,
+    // When enabled, parenthesized expressions are represented by
+    // (non-standard) ParenthesizedExpression nodes
+    preserveParens: false
+  };
 
-    case "ArrayExpression":
-      node.type = "ArrayPattern";
-      if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
-      this.toAssignableList(node.elements, isBinding);
-      break
+  // Interpret and default an options object
 
-    case "SpreadElement":
-      node.type = "RestElement";
-      this.toAssignable(node.argument, isBinding);
-      if (node.argument.type === "AssignmentPattern")
-        { this.raise(node.argument.start, "Rest elements cannot have a default value"); }
-      break
+  function getOptions(opts) {
+    var options = {};
 
-    case "AssignmentExpression":
-      if (node.operator !== "=") { this.raise(node.left.end, "Only '=' operator can be used for specifying default value."); }
-      node.type = "AssignmentPattern";
-      delete node.operator;
-      this.toAssignable(node.left, isBinding);
-      // falls through to AssignmentPattern
+    for (var opt in defaultOptions)
+      { options[opt] = opts && has(opts, opt) ? opts[opt] : defaultOptions[opt]; }
 
-    case "AssignmentPattern":
-      break
+    if (options.ecmaVersion >= 2015)
+      { options.ecmaVersion -= 2009; }
 
-    case "ParenthesizedExpression":
-      this.toAssignable(node.expression, isBinding, refDestructuringErrors);
-      break
+    if (options.allowReserved == null)
+      { options.allowReserved = options.ecmaVersion < 5; }
 
-    case "MemberExpression":
-      if (!isBinding) { break }
+    if (isArray(options.onToken)) {
+      var tokens = options.onToken;
+      options.onToken = function (token) { return tokens.push(token); };
+    }
+    if (isArray(options.onComment))
+      { options.onComment = pushComment(options, options.onComment); }
+
+    return options
+  }
+
+  function pushComment(options, array) {
+    return function(block, text, start, end, startLoc, endLoc) {
+      var comment = {
+        type: block ? "Block" : "Line",
+        value: text,
+        start: start,
+        end: end
+      };
+      if (options.locations)
+        { comment.loc = new SourceLocation(this, startLoc, endLoc); }
+      if (options.ranges)
+        { comment.range = [start, end]; }
+      array.push(comment);
+    }
+  }
 
-    default:
-      this.raise(node.start, "Assigning to rvalue");
+  // Each scope gets a bitset that may contain these flags
+  var
+      SCOPE_TOP = 1,
+      SCOPE_FUNCTION = 2,
+      SCOPE_VAR = SCOPE_TOP | SCOPE_FUNCTION,
+      SCOPE_ASYNC = 4,
+      SCOPE_GENERATOR = 8,
+      SCOPE_ARROW = 16,
+      SCOPE_SIMPLE_CATCH = 32,
+      SCOPE_SUPER = 64,
+      SCOPE_DIRECT_SUPER = 128;
+
+  function functionFlags(async, generator) {
+    return SCOPE_FUNCTION | (async ? SCOPE_ASYNC : 0) | (generator ? SCOPE_GENERATOR : 0)
+  }
+
+  // Used in checkLVal and declareName to determine the type of a binding
+  var
+      BIND_NONE = 0, // Not a binding
+      BIND_VAR = 1, // Var-style binding
+      BIND_LEXICAL = 2, // Let- or const-style binding
+      BIND_FUNCTION = 3, // Function declaration
+      BIND_SIMPLE_CATCH = 4, // Simple (identifier pattern) catch binding
+      BIND_OUTSIDE = 5; // Special case for function names as bound inside the function
+
+  var Parser = function Parser(options, input, startPos) {
+    this.options = options = getOptions(options);
+    this.sourceFile = options.sourceFile;
+    this.keywords = wordsRegexp(keywords[options.ecmaVersion >= 6 ? 6 : 5]);
+    var reserved = "";
+    if (!options.allowReserved) {
+      for (var v = options.ecmaVersion;; v--)
+        { if (reserved = reservedWords[v]) { break } }
+      if (options.sourceType === "module") { reserved += " await"; }
+    }
+    this.reservedWords = wordsRegexp(reserved);
+    var reservedStrict = (reserved ? reserved + " " : "") + reservedWords.strict;
+    this.reservedWordsStrict = wordsRegexp(reservedStrict);
+    this.reservedWordsStrictBind = wordsRegexp(reservedStrict + " " + reservedWords.strictBind);
+    this.input = String(input);
+
+    // Used to signal to callers of `readWord1` whether the word
+    // contained any escape sequences. This is needed because words with
+    // escape sequences must not be interpreted as keywords.
+    this.containsEsc = false;
+
+    // Set up token state
+
+    // The current position of the tokenizer in the input.
+    if (startPos) {
+      this.pos = startPos;
+      this.lineStart = this.input.lastIndexOf("\n", startPos - 1) + 1;
+      this.curLine = this.input.slice(0, this.lineStart).split(lineBreak).length;
+    } else {
+      this.pos = this.lineStart = 0;
+      this.curLine = 1;
     }
-  } else if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
-  return node
-};
 
-// Convert list of expression atoms to binding list.
+    // Properties of the current token:
+    // Its type
+    this.type = types.eof;
+    // For tokens that include more information than their type, the value
+    this.value = null;
+    // Its start and end offset
+    this.start = this.end = this.pos;
+    // And, if locations are used, the {line, column} object
+    // corresponding to those offsets
+    this.startLoc = this.endLoc = this.curPosition();
+
+    // Position information for the previous token
+    this.lastTokEndLoc = this.lastTokStartLoc = null;
+    this.lastTokStart = this.lastTokEnd = this.pos;
+
+    // The context stack is used to superficially track syntactic
+    // context to predict whether a regular expression is allowed in a
+    // given position.
+    this.context = this.initialContext();
+    this.exprAllowed = true;
 
-pp$2.toAssignableList = function(exprList, isBinding) {
-  var this$1 = this;
+    // Figure out if it's a module code.
+    this.inModule = options.sourceType === "module";
+    this.strict = this.inModule || this.strictDirective(this.pos);
 
-  var end = exprList.length;
-  for (var i = 0; i < end; i++) {
-    var elt = exprList[i];
-    if (elt) { this$1.toAssignable(elt, isBinding); }
-  }
-  if (end) {
-    var last = exprList[end - 1];
-    if (this.options.ecmaVersion === 6 && isBinding && last && last.type === "RestElement" && last.argument.type !== "Identifier")
-      { this.unexpected(last.argument.start); }
-  }
-  return exprList
-};
+    // Used to signify the start of a potential arrow function
+    this.potentialArrowAt = -1;
 
-// Parses spread element.
+    // Positions to delayed-check that yield/await does not exist in default parameters.
+    this.yieldPos = this.awaitPos = this.awaitIdentPos = 0;
+    // Labels in scope.
+    this.labels = [];
+    // Thus-far undefined exports.
+    this.undefinedExports = {};
 
-pp$2.parseSpread = function(refDestructuringErrors) {
-  var node = this.startNode();
-  this.next();
-  node.argument = this.parseMaybeAssign(false, refDestructuringErrors);
-  return this.finishNode(node, "SpreadElement")
-};
+    // If enabled, skip leading hashbang line.
+    if (this.pos === 0 && options.allowHashBang && this.input.slice(0, 2) === "#!")
+      { this.skipLineComment(2); }
 
-pp$2.parseRestBinding = function() {
-  var node = this.startNode();
-  this.next();
+    // Scope tracking for duplicate variable names (see scope.js)
+    this.scopeStack = [];
+    this.enterScope(SCOPE_TOP);
 
-  // RestElement inside of a function parameter must be an identifier
-  if (this.options.ecmaVersion === 6 && this.type !== types.name)
-    { this.unexpected(); }
+    // For RegExp validation
+    this.regexpState = null;
+  };
 
-  node.argument = this.parseBindingAtom();
+  var prototypeAccessors = { inFunction: { configurable: true },inGenerator: { configurable: true },inAsync: { configurable: true },allowSuper: { configurable: true },allowDirectSuper: { configurable: true },treatFunctionsAsVar: { configurable: true } };
 
-  return this.finishNode(node, "RestElement")
-};
+  Parser.prototype.parse = function parse () {
+    var node = this.options.program || this.startNode();
+    this.nextToken();
+    return this.parseTopLevel(node)
+  };
 
-// Parses lvalue (assignable) atom.
+  prototypeAccessors.inFunction.get = function () { return (this.currentVarScope().flags & SCOPE_FUNCTION) > 0 };
+  prototypeAccessors.inGenerator.get = function () { return (this.currentVarScope().flags & SCOPE_GENERATOR) > 0 };
+  prototypeAccessors.inAsync.get = function () { return (this.currentVarScope().flags & SCOPE_ASYNC) > 0 };
+  prototypeAccessors.allowSuper.get = function () { return (this.currentThisScope().flags & SCOPE_SUPER) > 0 };
+  prototypeAccessors.allowDirectSuper.get = function () { return (this.currentThisScope().flags & SCOPE_DIRECT_SUPER) > 0 };
+  prototypeAccessors.treatFunctionsAsVar.get = function () { return this.treatFunctionsAsVarInScope(this.currentScope()) };
 
-pp$2.parseBindingAtom = function() {
-  if (this.options.ecmaVersion >= 6) {
-    switch (this.type) {
-    case types.bracketL:
-      var node = this.startNode();
-      this.next();
-      node.elements = this.parseBindingList(types.bracketR, true, true);
-      return this.finishNode(node, "ArrayPattern")
+  // Switch to a getter for 7.0.0.
+  Parser.prototype.inNonArrowFunction = function inNonArrowFunction () { return (this.currentThisScope().flags & SCOPE_FUNCTION) > 0 };
 
-    case types.braceL:
-      return this.parseObj(true)
-    }
-  }
-  return this.parseIdent()
-};
-
-pp$2.parseBindingList = function(close, allowEmpty, allowTrailingComma) {
-  var this$1 = this;
-
-  var elts = [], first = true;
-  while (!this.eat(close)) {
-    if (first) { first = false; }
-    else { this$1.expect(types.comma); }
-    if (allowEmpty && this$1.type === types.comma) {
-      elts.push(null);
-    } else if (allowTrailingComma && this$1.afterTrailingComma(close)) {
-      break
-    } else if (this$1.type === types.ellipsis) {
-      var rest = this$1.parseRestBinding();
-      this$1.parseBindingListItem(rest);
-      elts.push(rest);
-      if (this$1.type === types.comma) { this$1.raise(this$1.start, "Comma is not permitted after the rest element"); }
-      this$1.expect(close);
-      break
-    } else {
-      var elem = this$1.parseMaybeDefault(this$1.start, this$1.startLoc);
-      this$1.parseBindingListItem(elem);
-      elts.push(elem);
-    }
-  }
-  return elts
-};
-
-pp$2.parseBindingListItem = function(param) {
-  return param
-};
-
-// Parses assignment pattern around given atom if possible.
-
-pp$2.parseMaybeDefault = function(startPos, startLoc, left) {
-  left = left || this.parseBindingAtom();
-  if (this.options.ecmaVersion < 6 || !this.eat(types.eq)) { return left }
-  var node = this.startNodeAt(startPos, startLoc);
-  node.left = left;
-  node.right = this.parseMaybeAssign();
-  return this.finishNode(node, "AssignmentPattern")
-};
-
-// Verify that a node is an lval — something that can be assigned
-// to.
-// bindingType can be either:
-// 'var' indicating that the lval creates a 'var' binding
-// 'let' indicating that the lval creates a lexical ('let' or 'const') binding
-// 'none' indicating that the binding should be checked for illegal identifiers, but not for duplicate references
-
-pp$2.checkLVal = function(expr, bindingType, checkClashes) {
-  var this$1 = this;
-  if ( bindingType === void 0 ) bindingType = BIND_NONE;
-
-  switch (expr.type) {
-  case "Identifier":
-    if (this.strict && this.reservedWordsStrictBind.test(expr.name))
-      { this.raiseRecoverable(expr.start, (bindingType ? "Binding " : "Assigning to ") + expr.name + " in strict mode"); }
-    if (checkClashes) {
-      if (has(checkClashes, expr.name))
-        { this.raiseRecoverable(expr.start, "Argument name clash"); }
-      checkClashes[expr.name] = true;
-    }
-    if (bindingType !== BIND_NONE && bindingType !== BIND_OUTSIDE) { this.declareName(expr.name, bindingType, expr.start); }
-    break
-
-  case "MemberExpression":
-    if (bindingType) { this.raiseRecoverable(expr.start, "Binding member expression"); }
-    break
-
-  case "ObjectPattern":
-    for (var i = 0, list = expr.properties; i < list.length; i += 1)
-      {
-    var prop = list[i];
+  Parser.extend = function extend () {
+      var plugins = [], len = arguments.length;
+      while ( len-- ) plugins[ len ] = arguments[ len ];
 
-    this$1.checkLVal(prop, bindingType, checkClashes);
-  }
-    break
+    var cls = this;
+    for (var i = 0; i < plugins.length; i++) { cls = plugins[i](cls); }
+    return cls
+  };
 
-  case "Property":
-    // AssignmentProperty has type === "Property"
-    this.checkLVal(expr.value, bindingType, checkClashes);
-    break
+  Parser.parse = function parse (input, options) {
+    return new this(options, input).parse()
+  };
 
-  case "ArrayPattern":
-    for (var i$1 = 0, list$1 = expr.elements; i$1 < list$1.length; i$1 += 1) {
-      var elem = list$1[i$1];
+  Parser.parseExpressionAt = function parseExpressionAt (input, pos, options) {
+    var parser = new this(options, input, pos);
+    parser.nextToken();
+    return parser.parseExpression()
+  };
 
-    if (elem) { this$1.checkLVal(elem, bindingType, checkClashes); }
-    }
-    break
+  Parser.tokenizer = function tokenizer (input, options) {
+    return new this(options, input)
+  };
 
-  case "AssignmentPattern":
-    this.checkLVal(expr.left, bindingType, checkClashes);
-    break
+  Object.defineProperties( Parser.prototype, prototypeAccessors );
 
-  case "RestElement":
-    this.checkLVal(expr.argument, bindingType, checkClashes);
-    break
+  var pp = Parser.prototype;
 
-  case "ParenthesizedExpression":
-    this.checkLVal(expr.expression, bindingType, checkClashes);
-    break
+  // ## Parser utilities
 
-  default:
-    this.raise(expr.start, (bindingType ? "Binding" : "Assigning to") + " rvalue");
-  }
-};
-
-// A recursive descent parser operates by defining functions for all
-// syntactic elements, and recursively calling those, each function
-// advancing the input stream and returning an AST node. Precedence
-// of constructs (for example, the fact that `!x[1]` means `!(x[1])`
-// instead of `(!x)[1]` is handled by the fact that the parser
-// function that parses unary prefix operators is called first, and
-// in turn calls the function that parses `[]` subscripts — that
-// way, it'll receive the node for `x[1]` already parsed, and wraps
-// *that* in the unary operator node.
-//
-// Acorn uses an [operator precedence parser][opp] to handle binary
-// operator precedence, because it is much more compact than using
-// the technique outlined above, which uses different, nesting
-// functions to specify precedence, for all of the ten binary
-// precedence levels that JavaScript defines.
-//
-// [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser
-
-var pp$3 = Parser.prototype;
-
-// Check if property name clashes with already added.
-// Object/class getters and setters are not allowed to clash —
-// either with each other or with an init property — and in
-// strict mode, init properties are also not allowed to be repeated.
-
-pp$3.checkPropClash = function(prop, propHash, refDestructuringErrors) {
-  if (this.options.ecmaVersion >= 9 && prop.type === "SpreadElement")
-    { return }
-  if (this.options.ecmaVersion >= 6 && (prop.computed || prop.method || prop.shorthand))
-    { return }
-  var key = prop.key;
-  var name;
-  switch (key.type) {
-  case "Identifier": name = key.name; break
-  case "Literal": name = String(key.value); break
-  default: return
-  }
-  var kind = prop.kind;
-  if (this.options.ecmaVersion >= 6) {
-    if (name === "__proto__" && kind === "init") {
-      if (propHash.proto) {
-        if (refDestructuringErrors && refDestructuringErrors.doubleProto < 0) { refDestructuringErrors.doubleProto = key.start; }
-        // Backwards-compat kludge. Can be removed in version 6.0
-        else { this.raiseRecoverable(key.start, "Redefinition of __proto__ property"); }
-      }
-      propHash.proto = true;
+  var literal = /^(?:'((?:\\.|[^'])*?)'|"((?:\\.|[^"])*?)")/;
+  pp.strictDirective = function(start) {
+    for (;;) {
+      // Try to find string literal.
+      skipWhiteSpace.lastIndex = start;
+      start += skipWhiteSpace.exec(this.input)[0].length;
+      var match = literal.exec(this.input.slice(start));
+      if (!match) { return false }
+      if ((match[1] || match[2]) === "use strict") { return true }
+      start += match[0].length;
+
+      // Skip semicolon, if any.
+      skipWhiteSpace.lastIndex = start;
+      start += skipWhiteSpace.exec(this.input)[0].length;
+      if (this.input[start] === ";")
+        { start++; }
     }
-    return
-  }
-  name = "$" + name;
-  var other = propHash[name];
-  if (other) {
-    var redefinition;
-    if (kind === "init") {
-      redefinition = this.strict && other.init || other.get || other.set;
-    } else {
-      redefinition = other.init || other[kind];
-    }
-    if (redefinition)
-      { this.raiseRecoverable(key.start, "Redefinition of property"); }
-  } else {
-    other = propHash[name] = {
-      init: false,
-      get: false,
-      set: false
-    };
-  }
-  other[kind] = true;
-};
-
-// ### Expression parsing
-
-// These nest, from the most general expression type at the top to
-// 'atomic', nondivisible expression types at the bottom. Most of
-// the functions will simply let the function(s) below them parse,
-// and, *if* the syntactic construct they handle is present, wrap
-// the AST node that the inner parser gave them in another node.
-
-// Parse a full expression. The optional arguments are used to
-// forbid the `in` operator (in for loops initalization expressions)
-// and provide reference for storing '=' operator inside shorthand
-// property assignment in contexts where both object expression
-// and object pattern might appear (so it's possible to raise
-// delayed syntax error at correct position).
-
-pp$3.parseExpression = function(noIn, refDestructuringErrors) {
-  var this$1 = this;
-
-  var startPos = this.start, startLoc = this.startLoc;
-  var expr = this.parseMaybeAssign(noIn, refDestructuringErrors);
-  if (this.type === types.comma) {
-    var node = this.startNodeAt(startPos, startLoc);
-    node.expressions = [expr];
-    while (this.eat(types.comma)) { node.expressions.push(this$1.parseMaybeAssign(noIn, refDestructuringErrors)); }
-    return this.finishNode(node, "SequenceExpression")
-  }
-  return expr
-};
-
-// Parse an assignment expression. This includes applications of
-// operators like `+=`.
-
-pp$3.parseMaybeAssign = function(noIn, refDestructuringErrors, afterLeftParse) {
-  if (this.isContextual("yield")) {
-    if (this.inGenerator) { return this.parseYield(noIn) }
-    // The tokenizer will assume an expression is allowed after
-    // `yield`, but this isn't that kind of yield
-    else { this.exprAllowed = false; }
-  }
+  };
 
-  var ownDestructuringErrors = false, oldParenAssign = -1, oldTrailingComma = -1, oldShorthandAssign = -1;
-  if (refDestructuringErrors) {
-    oldParenAssign = refDestructuringErrors.parenthesizedAssign;
-    oldTrailingComma = refDestructuringErrors.trailingComma;
-    oldShorthandAssign = refDestructuringErrors.shorthandAssign;
-    refDestructuringErrors.parenthesizedAssign = refDestructuringErrors.trailingComma = refDestructuringErrors.shorthandAssign = -1;
-  } else {
-    refDestructuringErrors = new DestructuringErrors;
-    ownDestructuringErrors = true;
-  }
+  // Predicate that tests whether the next token is of the given
+  // type, and if yes, consumes it as a side effect.
 
-  var startPos = this.start, startLoc = this.startLoc;
-  if (this.type === types.parenL || this.type === types.name)
-    { this.potentialArrowAt = this.start; }
-  var left = this.parseMaybeConditional(noIn, refDestructuringErrors);
-  if (afterLeftParse) { left = afterLeftParse.call(this, left, startPos, startLoc); }
-  if (this.type.isAssign) {
-    var node = this.startNodeAt(startPos, startLoc);
-    node.operator = this.value;
-    node.left = this.type === types.eq ? this.toAssignable(left, false, refDestructuringErrors) : left;
-    if (!ownDestructuringErrors) { DestructuringErrors.call(refDestructuringErrors); }
-    refDestructuringErrors.shorthandAssign = -1; // reset because shorthand default was used correctly
-    this.checkLVal(left);
-    this.next();
-    node.right = this.parseMaybeAssign(noIn);
-    return this.finishNode(node, "AssignmentExpression")
-  } else {
-    if (ownDestructuringErrors) { this.checkExpressionErrors(refDestructuringErrors, true); }
-  }
-  if (oldParenAssign > -1) { refDestructuringErrors.parenthesizedAssign = oldParenAssign; }
-  if (oldTrailingComma > -1) { refDestructuringErrors.trailingComma = oldTrailingComma; }
-  if (oldShorthandAssign > -1) { refDestructuringErrors.shorthandAssign = oldShorthandAssign; }
-  return left
-};
-
-// Parse a ternary conditional (`?:`) operator.
-
-pp$3.parseMaybeConditional = function(noIn, refDestructuringErrors) {
-  var startPos = this.start, startLoc = this.startLoc;
-  var expr = this.parseExprOps(noIn, refDestructuringErrors);
-  if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
-  if (this.eat(types.question)) {
-    var node = this.startNodeAt(startPos, startLoc);
-    node.test = expr;
-    node.consequent = this.parseMaybeAssign();
-    this.expect(types.colon);
-    node.alternate = this.parseMaybeAssign(noIn);
-    return this.finishNode(node, "ConditionalExpression")
-  }
-  return expr
-};
-
-// Start the precedence parser.
-
-pp$3.parseExprOps = function(noIn, refDestructuringErrors) {
-  var startPos = this.start, startLoc = this.startLoc;
-  var expr = this.parseMaybeUnary(refDestructuringErrors, false);
-  if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
-  return expr.start === startPos && expr.type === "ArrowFunctionExpression" ? expr : this.parseExprOp(expr, startPos, startLoc, -1, noIn)
-};
-
-// Parse binary operators with the operator precedence parsing
-// algorithm. `left` is the left-hand side of the operator.
-// `minPrec` provides context that allows the function to stop and
-// defer further parser to one of its callers when it encounters an
-// operator that has a lower precedence than the set it is parsing.
-
-pp$3.parseExprOp = function(left, leftStartPos, leftStartLoc, minPrec, noIn) {
-  var prec = this.type.binop;
-  if (prec != null && (!noIn || this.type !== types._in)) {
-    if (prec > minPrec) {
-      var logical = this.type === types.logicalOR || this.type === types.logicalAND;
-      var op = this.value;
+  pp.eat = function(type) {
+    if (this.type === type) {
       this.next();
-      var startPos = this.start, startLoc = this.startLoc;
-      var right = this.parseExprOp(this.parseMaybeUnary(null, false), startPos, startLoc, prec, noIn);
-      var node = this.buildBinary(leftStartPos, leftStartLoc, left, right, op, logical);
-      return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn)
-    }
-  }
-  return left
-};
-
-pp$3.buildBinary = function(startPos, startLoc, left, right, op, logical) {
-  var node = this.startNodeAt(startPos, startLoc);
-  node.left = left;
-  node.operator = op;
-  node.right = right;
-  return this.finishNode(node, logical ? "LogicalExpression" : "BinaryExpression")
-};
-
-// Parse unary operators, both prefix and postfix.
-
-pp$3.parseMaybeUnary = function(refDestructuringErrors, sawUnary) {
-  var this$1 = this;
-
-  var startPos = this.start, startLoc = this.startLoc, expr;
-  if (this.isContextual("await") && (this.inAsync || (!this.inFunction && this.options.allowAwaitOutsideFunction))) {
-    expr = this.parseAwait();
-    sawUnary = true;
-  } else if (this.type.prefix) {
-    var node = this.startNode(), update = this.type === types.incDec;
-    node.operator = this.value;
-    node.prefix = true;
-    this.next();
-    node.argument = this.parseMaybeUnary(null, true);
-    this.checkExpressionErrors(refDestructuringErrors, true);
-    if (update) { this.checkLVal(node.argument); }
-    else if (this.strict && node.operator === "delete" &&
-             node.argument.type === "Identifier")
-      { this.raiseRecoverable(node.start, "Deleting local variable in strict mode"); }
-    else { sawUnary = true; }
-    expr = this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
-  } else {
-    expr = this.parseExprSubscripts(refDestructuringErrors);
-    if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
-    while (this.type.postfix && !this.canInsertSemicolon()) {
-      var node$1 = this$1.startNodeAt(startPos, startLoc);
-      node$1.operator = this$1.value;
-      node$1.prefix = false;
-      node$1.argument = expr;
-      this$1.checkLVal(expr);
-      this$1.next();
-      expr = this$1.finishNode(node$1, "UpdateExpression");
+      return true
+    } else {
+      return false
     }
-  }
+  };
 
-  if (!sawUnary && this.eat(types.starstar))
-    { return this.buildBinary(startPos, startLoc, expr, this.parseMaybeUnary(null, false), "**", false) }
-  else
-    { return expr }
-};
-
-// Parse call, dot, and `[]`-subscript expressions.
-
-pp$3.parseExprSubscripts = function(refDestructuringErrors) {
-  var startPos = this.start, startLoc = this.startLoc;
-  var expr = this.parseExprAtom(refDestructuringErrors);
-  var skipArrowSubscripts = expr.type === "ArrowFunctionExpression" && this.input.slice(this.lastTokStart, this.lastTokEnd) !== ")";
-  if (this.checkExpressionErrors(refDestructuringErrors) || skipArrowSubscripts) { return expr }
-  var result = this.parseSubscripts(expr, startPos, startLoc);
-  if (refDestructuringErrors && result.type === "MemberExpression") {
-    if (refDestructuringErrors.parenthesizedAssign >= result.start) { refDestructuringErrors.parenthesizedAssign = -1; }
-    if (refDestructuringErrors.parenthesizedBind >= result.start) { refDestructuringErrors.parenthesizedBind = -1; }
-  }
-  return result
-};
-
-pp$3.parseSubscripts = function(base, startPos, startLoc, noCalls) {
-  var this$1 = this;
-
-  var maybeAsyncArrow = this.options.ecmaVersion >= 8 && base.type === "Identifier" && base.name === "async" &&
-      this.lastTokEnd === base.end && !this.canInsertSemicolon() && this.input.slice(base.start, base.end) === "async";
-  while (true) {
-    var element = this$1.parseSubscript(base, startPos, startLoc, noCalls, maybeAsyncArrow);
-    if (element === base || element.type === "ArrowFunctionExpression") { return element }
-    base = element;
-  }
-};
+  // Tests whether parsed token is a contextual keyword.
 
-pp$3.parseSubscript = function(base, startPos, startLoc, noCalls, maybeAsyncArrow) {
-  var computed = this.eat(types.bracketL);
-  if (computed || this.eat(types.dot)) {
-    var node = this.startNodeAt(startPos, startLoc);
-    node.object = base;
-    node.property = computed ? this.parseExpression() : this.parseIdent(true);
-    node.computed = !!computed;
-    if (computed) { this.expect(types.bracketR); }
-    base = this.finishNode(node, "MemberExpression");
-  } else if (!noCalls && this.eat(types.parenL)) {
-    var refDestructuringErrors = new DestructuringErrors, oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
-    this.yieldPos = 0;
-    this.awaitPos = 0;
-    this.awaitIdentPos = 0;
-    var exprList = this.parseExprList(types.parenR, this.options.ecmaVersion >= 8, false, refDestructuringErrors);
-    if (maybeAsyncArrow && !this.canInsertSemicolon() && this.eat(types.arrow)) {
-      this.checkPatternErrors(refDestructuringErrors, false);
-      this.checkYieldAwaitInDefaultParams();
-      if (this.awaitIdentPos > 0)
-        { this.raise(this.awaitIdentPos, "Cannot use 'await' as identifier inside an async function"); }
-      this.yieldPos = oldYieldPos;
-      this.awaitPos = oldAwaitPos;
-      this.awaitIdentPos = oldAwaitIdentPos;
-      return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList, true)
-    }
-    this.checkExpressionErrors(refDestructuringErrors, true);
-    this.yieldPos = oldYieldPos || this.yieldPos;
-    this.awaitPos = oldAwaitPos || this.awaitPos;
-    this.awaitIdentPos = oldAwaitIdentPos || this.awaitIdentPos;
-    var node$1 = this.startNodeAt(startPos, startLoc);
-    node$1.callee = base;
-    node$1.arguments = exprList;
-    base = this.finishNode(node$1, "CallExpression");
-  } else if (this.type === types.backQuote) {
-    var node$2 = this.startNodeAt(startPos, startLoc);
-    node$2.tag = base;
-    node$2.quasi = this.parseTemplate({isTagged: true});
-    base = this.finishNode(node$2, "TaggedTemplateExpression");
-  }
-  return base
-};
-
-// Parse an atomic expression — either a single token that is an
-// expression, an expression started by a keyword like `function` or
-// `new`, or an expression wrapped in punctuation like `()`, `[]`,
-// or `{}`.
-
-pp$3.parseExprAtom = function(refDestructuringErrors) {
-  // If a division operator appears in an expression position, the
-  // tokenizer got confused, and we force it to read a regexp instead.
-  if (this.type === types.slash) { this.readRegexp(); }
-
-  var node, canBeArrow = this.potentialArrowAt === this.start;
-  switch (this.type) {
-  case types._super:
-    if (!this.allowSuper)
-      { this.raise(this.start, "'super' keyword outside a method"); }
-    node = this.startNode();
-    this.next();
-    if (this.type === types.parenL && !this.allowDirectSuper)
-      { this.raise(node.start, "super() call outside constructor of a subclass"); }
-    // The `super` keyword can appear at below:
-    // SuperProperty:
-    //     super [ Expression ]
-    //     super . IdentifierName
-    // SuperCall:
-    //     super Arguments
-    if (this.type !== types.dot && this.type !== types.bracketL && this.type !== types.parenL)
-      { this.unexpected(); }
-    return this.finishNode(node, "Super")
+  pp.isContextual = function(name) {
+    return this.type === types.name && this.value === name && !this.containsEsc
+  };
+
+  // Consumes contextual keyword if possible.
 
-  case types._this:
-    node = this.startNode();
+  pp.eatContextual = function(name) {
+    if (!this.isContextual(name)) { return false }
     this.next();
-    return this.finishNode(node, "ThisExpression")
-
-  case types.name:
-    var startPos = this.start, startLoc = this.startLoc, containsEsc = this.containsEsc;
-    var id = this.parseIdent(false);
-    if (this.options.ecmaVersion >= 8 && !containsEsc && id.name === "async" && !this.canInsertSemicolon() && this.eat(types._function))
-      { return this.parseFunction(this.startNodeAt(startPos, startLoc), 0, false, true) }
-    if (canBeArrow && !this.canInsertSemicolon()) {
-      if (this.eat(types.arrow))
-        { return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], false) }
-      if (this.options.ecmaVersion >= 8 && id.name === "async" && this.type === types.name && !containsEsc) {
-        id = this.parseIdent(false);
-        if (this.canInsertSemicolon() || !this.eat(types.arrow))
-          { this.unexpected(); }
-        return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], true)
-      }
-    }
-    return id
+    return true
+  };
 
-  case types.regexp:
-    var value = this.value;
-    node = this.parseLiteral(value.value);
-    node.regex = {pattern: value.pattern, flags: value.flags};
-    return node
+  // Asserts that following token is given contextual keyword.
 
-  case types.num: case types.string:
-    return this.parseLiteral(this.value)
+  pp.expectContextual = function(name) {
+    if (!this.eatContextual(name)) { this.unexpected(); }
+  };
 
-  case types._null: case types._true: case types._false:
-    node = this.startNode();
-    node.value = this.type === types._null ? null : this.type === types._true;
-    node.raw = this.type.keyword;
-    this.next();
-    return this.finishNode(node, "Literal")
+  // Test whether a semicolon can be inserted at the current position.
 
-  case types.parenL:
-    var start = this.start, expr = this.parseParenAndDistinguishExpression(canBeArrow);
-    if (refDestructuringErrors) {
-      if (refDestructuringErrors.parenthesizedAssign < 0 && !this.isSimpleAssignTarget(expr))
-        { refDestructuringErrors.parenthesizedAssign = start; }
-      if (refDestructuringErrors.parenthesizedBind < 0)
-        { refDestructuringErrors.parenthesizedBind = start; }
+  pp.canInsertSemicolon = function() {
+    return this.type === types.eof ||
+      this.type === types.braceR ||
+      lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
+  };
+
+  pp.insertSemicolon = function() {
+    if (this.canInsertSemicolon()) {
+      if (this.options.onInsertedSemicolon)
+        { this.options.onInsertedSemicolon(this.lastTokEnd, this.lastTokEndLoc); }
+      return true
     }
-    return expr
+  };
 
-  case types.bracketL:
-    node = this.startNode();
-    this.next();
-    node.elements = this.parseExprList(types.bracketR, true, true, refDestructuringErrors);
-    return this.finishNode(node, "ArrayExpression")
+  // Consume a semicolon, or, failing that, see if we are allowed to
+  // pretend that there is a semicolon at this position.
 
-  case types.braceL:
-    return this.parseObj(false, refDestructuringErrors)
+  pp.semicolon = function() {
+    if (!this.eat(types.semi) && !this.insertSemicolon()) { this.unexpected(); }
+  };
 
-  case types._function:
-    node = this.startNode();
-    this.next();
-    return this.parseFunction(node, 0)
+  pp.afterTrailingComma = function(tokType, notNext) {
+    if (this.type === tokType) {
+      if (this.options.onTrailingComma)
+        { this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc); }
+      if (!notNext)
+        { this.next(); }
+      return true
+    }
+  };
 
-  case types._class:
-    return this.parseClass(this.startNode(), false)
+  // Expect a token of a given type. If found, consume it, otherwise,
+  // raise an unexpected token error.
 
-  case types._new:
-    return this.parseNew()
+  pp.expect = function(type) {
+    this.eat(type) || this.unexpected();
+  };
 
-  case types.backQuote:
-    return this.parseTemplate()
+  // Raise an unexpected token error.
 
-  default:
-    this.unexpected();
-  }
-};
-
-pp$3.parseLiteral = function(value) {
-  var node = this.startNode();
-  node.value = value;
-  node.raw = this.input.slice(this.start, this.end);
-  this.next();
-  return this.finishNode(node, "Literal")
-};
-
-pp$3.parseParenExpression = function() {
-  this.expect(types.parenL);
-  var val = this.parseExpression();
-  this.expect(types.parenR);
-  return val
-};
-
-pp$3.parseParenAndDistinguishExpression = function(canBeArrow) {
-  var this$1 = this;
-
-  var startPos = this.start, startLoc = this.startLoc, val, allowTrailingComma = this.options.ecmaVersion >= 8;
-  if (this.options.ecmaVersion >= 6) {
-    this.next();
+  pp.unexpected = function(pos) {
+    this.raise(pos != null ? pos : this.start, "Unexpected token");
+  };
 
-    var innerStartPos = this.start, innerStartLoc = this.startLoc;
-    var exprList = [], first = true, lastIsComma = false;
-    var refDestructuringErrors = new DestructuringErrors, oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, spreadStart;
-    this.yieldPos = 0;
-    this.awaitPos = 0;
-    // Do not save awaitIdentPos to allow checking awaits nested in parameters
-    while (this.type !== types.parenR) {
-      first ? first = false : this$1.expect(types.comma);
-      if (allowTrailingComma && this$1.afterTrailingComma(types.parenR, true)) {
-        lastIsComma = true;
-        break
-      } else if (this$1.type === types.ellipsis) {
-        spreadStart = this$1.start;
-        exprList.push(this$1.parseParenItem(this$1.parseRestBinding()));
-        if (this$1.type === types.comma) { this$1.raise(this$1.start, "Comma is not permitted after the rest element"); }
-        break
-      } else {
-        exprList.push(this$1.parseMaybeAssign(false, refDestructuringErrors, this$1.parseParenItem));
-      }
-    }
-    var innerEndPos = this.start, innerEndLoc = this.startLoc;
-    this.expect(types.parenR);
+  function DestructuringErrors() {
+    this.shorthandAssign =
+    this.trailingComma =
+    this.parenthesizedAssign =
+    this.parenthesizedBind =
+    this.doubleProto =
+      -1;
+  }
+
+  pp.checkPatternErrors = function(refDestructuringErrors, isAssign) {
+    if (!refDestructuringErrors) { return }
+    if (refDestructuringErrors.trailingComma > -1)
+      { this.raiseRecoverable(refDestructuringErrors.trailingComma, "Comma is not permitted after the rest element"); }
+    var parens = isAssign ? refDestructuringErrors.parenthesizedAssign : refDestructuringErrors.parenthesizedBind;
+    if (parens > -1) { this.raiseRecoverable(parens, "Parenthesized pattern"); }
+  };
 
-    if (canBeArrow && !this.canInsertSemicolon() && this.eat(types.arrow)) {
-      this.checkPatternErrors(refDestructuringErrors, false);
-      this.checkYieldAwaitInDefaultParams();
-      this.yieldPos = oldYieldPos;
-      this.awaitPos = oldAwaitPos;
-      return this.parseParenArrowList(startPos, startLoc, exprList)
-    }
+  pp.checkExpressionErrors = function(refDestructuringErrors, andThrow) {
+    if (!refDestructuringErrors) { return false }
+    var shorthandAssign = refDestructuringErrors.shorthandAssign;
+    var doubleProto = refDestructuringErrors.doubleProto;
+    if (!andThrow) { return shorthandAssign >= 0 || doubleProto >= 0 }
+    if (shorthandAssign >= 0)
+      { this.raise(shorthandAssign, "Shorthand property assignments are valid only in destructuring patterns"); }
+    if (doubleProto >= 0)
+      { this.raiseRecoverable(doubleProto, "Redefinition of __proto__ property"); }
+  };
 
-    if (!exprList.length || lastIsComma) { this.unexpected(this.lastTokStart); }
-    if (spreadStart) { this.unexpected(spreadStart); }
-    this.checkExpressionErrors(refDestructuringErrors, true);
-    this.yieldPos = oldYieldPos || this.yieldPos;
-    this.awaitPos = oldAwaitPos || this.awaitPos;
+  pp.checkYieldAwaitInDefaultParams = function() {
+    if (this.yieldPos && (!this.awaitPos || this.yieldPos < this.awaitPos))
+      { this.raise(this.yieldPos, "Yield expression cannot be a default value"); }
+    if (this.awaitPos)
+      { this.raise(this.awaitPos, "Await expression cannot be a default value"); }
+  };
 
-    if (exprList.length > 1) {
-      val = this.startNodeAt(innerStartPos, innerStartLoc);
-      val.expressions = exprList;
-      this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
-    } else {
-      val = exprList[0];
-    }
-  } else {
-    val = this.parseParenExpression();
-  }
+  pp.isSimpleAssignTarget = function(expr) {
+    if (expr.type === "ParenthesizedExpression")
+      { return this.isSimpleAssignTarget(expr.expression) }
+    return expr.type === "Identifier" || expr.type === "MemberExpression"
+  };
 
-  if (this.options.preserveParens) {
-    var par = this.startNodeAt(startPos, startLoc);
-    par.expression = val;
-    return this.finishNode(par, "ParenthesizedExpression")
-  } else {
-    return val
-  }
-};
+  var pp$1 = Parser.prototype;
 
-pp$3.parseParenItem = function(item) {
-  return item
-};
+  // ### Statement parsing
 
-pp$3.parseParenArrowList = function(startPos, startLoc, exprList) {
-  return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList)
-};
+  // Parse a program. Initializes the parser, reads any number of
+  // statements, and wraps them in a Program node.  Optionally takes a
+  // `program` argument.  If present, the statements will be appended
+  // to its body instead of creating a new node.
 
-// New's precedence is slightly tricky. It must allow its argument to
-// be a `[]` or dot subscript expression, but not a call — at least,
-// not without wrapping it in parentheses. Thus, it uses the noCalls
-// argument to parseSubscripts to prevent it from consuming the
-// argument list.
+  pp$1.parseTopLevel = function(node) {
+    var exports = {};
+    if (!node.body) { node.body = []; }
+    while (this.type !== types.eof) {
+      var stmt = this.parseStatement(null, true, exports);
+      node.body.push(stmt);
+    }
+    if (this.inModule)
+      { for (var i = 0, list = Object.keys(this.undefinedExports); i < list.length; i += 1)
+        {
+          var name = list[i];
+
+          this.raiseRecoverable(this.undefinedExports[name].start, ("Export '" + name + "' is not defined"));
+        } }
+    this.adaptDirectivePrologue(node.body);
+    this.next();
+    if (this.options.ecmaVersion >= 6) {
+      node.sourceType = this.options.sourceType;
+    }
+    return this.finishNode(node, "Program")
+  };
+
+  var loopLabel = {kind: "loop"}, switchLabel = {kind: "switch"};
+
+  pp$1.isLet = function(context) {
+    if (this.options.ecmaVersion < 6 || !this.isContextual("let")) { return false }
+    skipWhiteSpace.lastIndex = this.pos;
+    var skip = skipWhiteSpace.exec(this.input);
+    var next = this.pos + skip[0].length, nextCh = this.input.charCodeAt(next);
+    // For ambiguous cases, determine if a LexicalDeclaration (or only a
+    // Statement) is allowed here. If context is not empty then only a Statement
+    // is allowed. However, `let [` is an explicit negative lookahead for
+    // ExpressionStatement, so special-case it first.
+    if (nextCh === 91) { return true } // '['
+    if (context) { return false }
+
+    if (nextCh === 123) { return true } // '{'
+    if (isIdentifierStart(nextCh, true)) {
+      var pos = next + 1;
+      while (isIdentifierChar(this.input.charCodeAt(pos), true)) { ++pos; }
+      var ident = this.input.slice(next, pos);
+      if (!keywordRelationalOperator.test(ident)) { return true }
+    }
+    return false
+  };
+
+  // check 'async [no LineTerminator here] function'
+  // - 'async /*foo*/ function' is OK.
+  // - 'async /*\n*/ function' is invalid.
+  pp$1.isAsyncFunction = function() {
+    if (this.options.ecmaVersion < 8 || !this.isContextual("async"))
+      { return false }
+
+    skipWhiteSpace.lastIndex = this.pos;
+    var skip = skipWhiteSpace.exec(this.input);
+    var next = this.pos + skip[0].length;
+    return !lineBreak.test(this.input.slice(this.pos, next)) &&
+      this.input.slice(next, next + 8) === "function" &&
+      (next + 8 === this.input.length || !isIdentifierChar(this.input.charAt(next + 8)))
+  };
+
+  // Parse a single statement.
+  //
+  // If expecting a statement and finding a slash operator, parse a
+  // regular expression literal. This is to handle cases like
+  // `if (foo) /blah/.exec(foo)`, where looking at the previous token
+  // does not help.
+
+  pp$1.parseStatement = function(context, topLevel, exports) {
+    var starttype = this.type, node = this.startNode(), kind;
+
+    if (this.isLet(context)) {
+      starttype = types._var;
+      kind = "let";
+    }
+
+    // Most types of statements are recognized by the keyword they
+    // start with. Many are trivial to parse, some require a bit of
+    // complexity.
+
+    switch (starttype) {
+    case types._break: case types._continue: return this.parseBreakContinueStatement(node, starttype.keyword)
+    case types._debugger: return this.parseDebuggerStatement(node)
+    case types._do: return this.parseDoStatement(node)
+    case types._for: return this.parseForStatement(node)
+    case types._function:
+      // Function as sole body of either an if statement or a labeled statement
+      // works, but not when it is part of a labeled statement that is the sole
+      // body of an if statement.
+      if ((context && (this.strict || context !== "if" && context !== "label")) && this.options.ecmaVersion >= 6) { this.unexpected(); }
+      return this.parseFunctionStatement(node, false, !context)
+    case types._class:
+      if (context) { this.unexpected(); }
+      return this.parseClass(node, true)
+    case types._if: return this.parseIfStatement(node)
+    case types._return: return this.parseReturnStatement(node)
+    case types._switch: return this.parseSwitchStatement(node)
+    case types._throw: return this.parseThrowStatement(node)
+    case types._try: return this.parseTryStatement(node)
+    case types._const: case types._var:
+      kind = kind || this.value;
+      if (context && kind !== "var") { this.unexpected(); }
+      return this.parseVarStatement(node, kind)
+    case types._while: return this.parseWhileStatement(node)
+    case types._with: return this.parseWithStatement(node)
+    case types.braceL: return this.parseBlock(true, node)
+    case types.semi: return this.parseEmptyStatement(node)
+    case types._export:
+    case types._import:
+      if (this.options.ecmaVersion > 10 && starttype === types._import) {
+        skipWhiteSpace.lastIndex = this.pos;
+        var skip = skipWhiteSpace.exec(this.input);
+        var next = this.pos + skip[0].length, nextCh = this.input.charCodeAt(next);
+        if (nextCh === 40) // '('
+          { return this.parseExpressionStatement(node, this.parseExpression()) }
+      }
+
+      if (!this.options.allowImportExportEverywhere) {
+        if (!topLevel)
+          { this.raise(this.start, "'import' and 'export' may only appear at the top level"); }
+        if (!this.inModule)
+          { this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'"); }
+      }
+      return starttype === types._import ? this.parseImport(node) : this.parseExport(node, exports)
+
+      // If the statement does not start with a statement keyword or a
+      // brace, it's an ExpressionStatement or LabeledStatement. We
+      // simply start parsing an expression, and afterwards, if the
+      // next token is a colon and the expression was a simple
+      // Identifier node, we switch to interpreting it as a label.
+    default:
+      if (this.isAsyncFunction()) {
+        if (context) { this.unexpected(); }
+        this.next();
+        return this.parseFunctionStatement(node, true, !context)
+      }
+
+      var maybeName = this.value, expr = this.parseExpression();
+      if (starttype === types.name && expr.type === "Identifier" && this.eat(types.colon))
+        { return this.parseLabeledStatement(node, maybeName, expr, context) }
+      else { return this.parseExpressionStatement(node, expr) }
+    }
+  };
+
+  pp$1.parseBreakContinueStatement = function(node, keyword) {
+    var isBreak = keyword === "break";
+    this.next();
+    if (this.eat(types.semi) || this.insertSemicolon()) { node.label = null; }
+    else if (this.type !== types.name) { this.unexpected(); }
+    else {
+      node.label = this.parseIdent();
+      this.semicolon();
+    }
+
+    // Verify that there is an actual destination to break or
+    // continue to.
+    var i = 0;
+    for (; i < this.labels.length; ++i) {
+      var lab = this.labels[i];
+      if (node.label == null || lab.name === node.label.name) {
+        if (lab.kind != null && (isBreak || lab.kind === "loop")) { break }
+        if (node.label && isBreak) { break }
+      }
+    }
+    if (i === this.labels.length) { this.raise(node.start, "Unsyntactic " + keyword); }
+    return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement")
+  };
+
+  pp$1.parseDebuggerStatement = function(node) {
+    this.next();
+    this.semicolon();
+    return this.finishNode(node, "DebuggerStatement")
+  };
+
+  pp$1.parseDoStatement = function(node) {
+    this.next();
+    this.labels.push(loopLabel);
+    node.body = this.parseStatement("do");
+    this.labels.pop();
+    this.expect(types._while);
+    node.test = this.parseParenExpression();
+    if (this.options.ecmaVersion >= 6)
+      { this.eat(types.semi); }
+    else
+      { this.semicolon(); }
+    return this.finishNode(node, "DoWhileStatement")
+  };
+
+  // Disambiguating between a `for` and a `for`/`in` or `for`/`of`
+  // loop is non-trivial. Basically, we have to parse the init `var`
+  // statement or expression, disallowing the `in` operator (see
+  // the second parameter to `parseExpression`), and then check
+  // whether the next token is `in` or `of`. When there is no init
+  // part (semicolon immediately after the opening parenthesis), it
+  // is a regular `for` loop.
+
+  pp$1.parseForStatement = function(node) {
+    this.next();
+    var awaitAt = (this.options.ecmaVersion >= 9 && (this.inAsync || (!this.inFunction && this.options.allowAwaitOutsideFunction)) && this.eatContextual("await")) ? this.lastTokStart : -1;
+    this.labels.push(loopLabel);
+    this.enterScope(0);
+    this.expect(types.parenL);
+    if (this.type === types.semi) {
+      if (awaitAt > -1) { this.unexpected(awaitAt); }
+      return this.parseFor(node, null)
+    }
+    var isLet = this.isLet();
+    if (this.type === types._var || this.type === types._const || isLet) {
+      var init$1 = this.startNode(), kind = isLet ? "let" : this.value;
+      this.next();
+      this.parseVar(init$1, true, kind);
+      this.finishNode(init$1, "VariableDeclaration");
+      if ((this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) && init$1.declarations.length === 1) {
+        if (this.options.ecmaVersion >= 9) {
+          if (this.type === types._in) {
+            if (awaitAt > -1) { this.unexpected(awaitAt); }
+          } else { node.await = awaitAt > -1; }
+        }
+        return this.parseForIn(node, init$1)
+      }
+      if (awaitAt > -1) { this.unexpected(awaitAt); }
+      return this.parseFor(node, init$1)
+    }
+    var refDestructuringErrors = new DestructuringErrors;
+    var init = this.parseExpression(true, refDestructuringErrors);
+    if (this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
+      if (this.options.ecmaVersion >= 9) {
+        if (this.type === types._in) {
+          if (awaitAt > -1) { this.unexpected(awaitAt); }
+        } else { node.await = awaitAt > -1; }
+      }
+      this.toAssignable(init, false, refDestructuringErrors);
+      this.checkLVal(init);
+      return this.parseForIn(node, init)
+    } else {
+      this.checkExpressionErrors(refDestructuringErrors, true);
+    }
+    if (awaitAt > -1) { this.unexpected(awaitAt); }
+    return this.parseFor(node, init)
+  };
+
+  pp$1.parseFunctionStatement = function(node, isAsync, declarationPosition) {
+    this.next();
+    return this.parseFunction(node, FUNC_STATEMENT | (declarationPosition ? 0 : FUNC_HANGING_STATEMENT), false, isAsync)
+  };
+
+  pp$1.parseIfStatement = function(node) {
+    this.next();
+    node.test = this.parseParenExpression();
+    // allow function declarations in branches, but only in non-strict mode
+    node.consequent = this.parseStatement("if");
+    node.alternate = this.eat(types._else) ? this.parseStatement("if") : null;
+    return this.finishNode(node, "IfStatement")
+  };
+
+  pp$1.parseReturnStatement = function(node) {
+    if (!this.inFunction && !this.options.allowReturnOutsideFunction)
+      { this.raise(this.start, "'return' outside of function"); }
+    this.next();
+
+    // In `return` (and `break`/`continue`), the keywords with
+    // optional arguments, we eagerly look for a semicolon or the
+    // possibility to insert one.
+
+    if (this.eat(types.semi) || this.insertSemicolon()) { node.argument = null; }
+    else { node.argument = this.parseExpression(); this.semicolon(); }
+    return this.finishNode(node, "ReturnStatement")
+  };
+
+  pp$1.parseSwitchStatement = function(node) {
+    this.next();
+    node.discriminant = this.parseParenExpression();
+    node.cases = [];
+    this.expect(types.braceL);
+    this.labels.push(switchLabel);
+    this.enterScope(0);
+
+    // Statements under must be grouped (by label) in SwitchCase
+    // nodes. `cur` is used to keep the node that we are currently
+    // adding statements to.
+
+    var cur;
+    for (var sawDefault = false; this.type !== types.braceR;) {
+      if (this.type === types._case || this.type === types._default) {
+        var isCase = this.type === types._case;
+        if (cur) { this.finishNode(cur, "SwitchCase"); }
+        node.cases.push(cur = this.startNode());
+        cur.consequent = [];
+        this.next();
+        if (isCase) {
+          cur.test = this.parseExpression();
+        } else {
+          if (sawDefault) { this.raiseRecoverable(this.lastTokStart, "Multiple default clauses"); }
+          sawDefault = true;
+          cur.test = null;
+        }
+        this.expect(types.colon);
+      } else {
+        if (!cur) { this.unexpected(); }
+        cur.consequent.push(this.parseStatement(null));
+      }
+    }
+    this.exitScope();
+    if (cur) { this.finishNode(cur, "SwitchCase"); }
+    this.next(); // Closing brace
+    this.labels.pop();
+    return this.finishNode(node, "SwitchStatement")
+  };
+
+  pp$1.parseThrowStatement = function(node) {
+    this.next();
+    if (lineBreak.test(this.input.slice(this.lastTokEnd, this.start)))
+      { this.raise(this.lastTokEnd, "Illegal newline after throw"); }
+    node.argument = this.parseExpression();
+    this.semicolon();
+    return this.finishNode(node, "ThrowStatement")
+  };
+
+  // Reused empty array added for node fields that are always empty.
+
+  var empty = [];
+
+  pp$1.parseTryStatement = function(node) {
+    this.next();
+    node.block = this.parseBlock();
+    node.handler = null;
+    if (this.type === types._catch) {
+      var clause = this.startNode();
+      this.next();
+      if (this.eat(types.parenL)) {
+        clause.param = this.parseBindingAtom();
+        var simple = clause.param.type === "Identifier";
+        this.enterScope(simple ? SCOPE_SIMPLE_CATCH : 0);
+        this.checkLVal(clause.param, simple ? BIND_SIMPLE_CATCH : BIND_LEXICAL);
+        this.expect(types.parenR);
+      } else {
+        if (this.options.ecmaVersion < 10) { this.unexpected(); }
+        clause.param = null;
+        this.enterScope(0);
+      }
+      clause.body = this.parseBlock(false);
+      this.exitScope();
+      node.handler = this.finishNode(clause, "CatchClause");
+    }
+    node.finalizer = this.eat(types._finally) ? this.parseBlock() : null;
+    if (!node.handler && !node.finalizer)
+      { this.raise(node.start, "Missing catch or finally clause"); }
+    return this.finishNode(node, "TryStatement")
+  };
+
+  pp$1.parseVarStatement = function(node, kind) {
+    this.next();
+    this.parseVar(node, false, kind);
+    this.semicolon();
+    return this.finishNode(node, "VariableDeclaration")
+  };
+
+  pp$1.parseWhileStatement = function(node) {
+    this.next();
+    node.test = this.parseParenExpression();
+    this.labels.push(loopLabel);
+    node.body = this.parseStatement("while");
+    this.labels.pop();
+    return this.finishNode(node, "WhileStatement")
+  };
+
+  pp$1.parseWithStatement = function(node) {
+    if (this.strict) { this.raise(this.start, "'with' in strict mode"); }
+    this.next();
+    node.object = this.parseParenExpression();
+    node.body = this.parseStatement("with");
+    return this.finishNode(node, "WithStatement")
+  };
+
+  pp$1.parseEmptyStatement = function(node) {
+    this.next();
+    return this.finishNode(node, "EmptyStatement")
+  };
+
+  pp$1.parseLabeledStatement = function(node, maybeName, expr, context) {
+    for (var i$1 = 0, list = this.labels; i$1 < list.length; i$1 += 1)
+      {
+      var label = list[i$1];
+
+      if (label.name === maybeName)
+        { this.raise(expr.start, "Label '" + maybeName + "' is already declared");
+    } }
+    var kind = this.type.isLoop ? "loop" : this.type === types._switch ? "switch" : null;
+    for (var i = this.labels.length - 1; i >= 0; i--) {
+      var label$1 = this.labels[i];
+      if (label$1.statementStart === node.start) {
+        // Update information about previous labels on this node
+        label$1.statementStart = this.start;
+        label$1.kind = kind;
+      } else { break }
+    }
+    this.labels.push({name: maybeName, kind: kind, statementStart: this.start});
+    node.body = this.parseStatement(context ? context.indexOf("label") === -1 ? context + "label" : context : "label");
+    this.labels.pop();
+    node.label = expr;
+    return this.finishNode(node, "LabeledStatement")
+  };
+
+  pp$1.parseExpressionStatement = function(node, expr) {
+    node.expression = expr;
+    this.semicolon();
+    return this.finishNode(node, "ExpressionStatement")
+  };
+
+  // Parse a semicolon-enclosed block of statements, handling `"use
+  // strict"` declarations when `allowStrict` is true (used for
+  // function bodies).
+
+  pp$1.parseBlock = function(createNewLexicalScope, node) {
+    if ( createNewLexicalScope === void 0 ) createNewLexicalScope = true;
+    if ( node === void 0 ) node = this.startNode();
+
+    node.body = [];
+    this.expect(types.braceL);
+    if (createNewLexicalScope) { this.enterScope(0); }
+    while (!this.eat(types.braceR)) {
+      var stmt = this.parseStatement(null);
+      node.body.push(stmt);
+    }
+    if (createNewLexicalScope) { this.exitScope(); }
+    return this.finishNode(node, "BlockStatement")
+  };
+
+  // Parse a regular `for` loop. The disambiguation code in
+  // `parseStatement` will already have parsed the init statement or
+  // expression.
+
+  pp$1.parseFor = function(node, init) {
+    node.init = init;
+    this.expect(types.semi);
+    node.test = this.type === types.semi ? null : this.parseExpression();
+    this.expect(types.semi);
+    node.update = this.type === types.parenR ? null : this.parseExpression();
+    this.expect(types.parenR);
+    node.body = this.parseStatement("for");
+    this.exitScope();
+    this.labels.pop();
+    return this.finishNode(node, "ForStatement")
+  };
+
+  // Parse a `for`/`in` and `for`/`of` loop, which are almost
+  // same from parser's perspective.
+
+  pp$1.parseForIn = function(node, init) {
+    var isForIn = this.type === types._in;
+    this.next();
+
+    if (
+      init.type === "VariableDeclaration" &&
+      init.declarations[0].init != null &&
+      (
+        !isForIn ||
+        this.options.ecmaVersion < 8 ||
+        this.strict ||
+        init.kind !== "var" ||
+        init.declarations[0].id.type !== "Identifier"
+      )
+    ) {
+      this.raise(
+        init.start,
+        ((isForIn ? "for-in" : "for-of") + " loop variable declaration may not have an initializer")
+      );
+    } else if (init.type === "AssignmentPattern") {
+      this.raise(init.start, "Invalid left-hand side in for-loop");
+    }
+    node.left = init;
+    node.right = isForIn ? this.parseExpression() : this.parseMaybeAssign();
+    this.expect(types.parenR);
+    node.body = this.parseStatement("for");
+    this.exitScope();
+    this.labels.pop();
+    return this.finishNode(node, isForIn ? "ForInStatement" : "ForOfStatement")
+  };
+
+  // Parse a list of variable declarations.
+
+  pp$1.parseVar = function(node, isFor, kind) {
+    node.declarations = [];
+    node.kind = kind;
+    for (;;) {
+      var decl = this.startNode();
+      this.parseVarId(decl, kind);
+      if (this.eat(types.eq)) {
+        decl.init = this.parseMaybeAssign(isFor);
+      } else if (kind === "const" && !(this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of")))) {
+        this.unexpected();
+      } else if (decl.id.type !== "Identifier" && !(isFor && (this.type === types._in || this.isContextual("of")))) {
+        this.raise(this.lastTokEnd, "Complex binding patterns require an initialization value");
+      } else {
+        decl.init = null;
+      }
+      node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
+      if (!this.eat(types.comma)) { break }
+    }
+    return node
+  };
+
+  pp$1.parseVarId = function(decl, kind) {
+    decl.id = this.parseBindingAtom();
+    this.checkLVal(decl.id, kind === "var" ? BIND_VAR : BIND_LEXICAL, false);
+  };
+
+  var FUNC_STATEMENT = 1, FUNC_HANGING_STATEMENT = 2, FUNC_NULLABLE_ID = 4;
+
+  // Parse a function declaration or literal (depending on the
+  // `statement & FUNC_STATEMENT`).
+
+  // Remove `allowExpressionBody` for 7.0.0, as it is only called with false
+  pp$1.parseFunction = function(node, statement, allowExpressionBody, isAsync) {
+    this.initFunction(node);
+    if (this.options.ecmaVersion >= 9 || this.options.ecmaVersion >= 6 && !isAsync) {
+      if (this.type === types.star && (statement & FUNC_HANGING_STATEMENT))
+        { this.unexpected(); }
+      node.generator = this.eat(types.star);
+    }
+    if (this.options.ecmaVersion >= 8)
+      { node.async = !!isAsync; }
+
+    if (statement & FUNC_STATEMENT) {
+      node.id = (statement & FUNC_NULLABLE_ID) && this.type !== types.name ? null : this.parseIdent();
+      if (node.id && !(statement & FUNC_HANGING_STATEMENT))
+        // If it is a regular function declaration in sloppy mode, then it is
+        // subject to Annex B semantics (BIND_FUNCTION). Otherwise, the binding
+        // mode depends on properties of the current scope (see
+        // treatFunctionsAsVar).
+        { this.checkLVal(node.id, (this.strict || node.generator || node.async) ? this.treatFunctionsAsVar ? BIND_VAR : BIND_LEXICAL : BIND_FUNCTION); }
+    }
+
+    var oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
+    this.yieldPos = 0;
+    this.awaitPos = 0;
+    this.awaitIdentPos = 0;
+    this.enterScope(functionFlags(node.async, node.generator));
+
+    if (!(statement & FUNC_STATEMENT))
+      { node.id = this.type === types.name ? this.parseIdent() : null; }
+
+    this.parseFunctionParams(node);
+    this.parseFunctionBody(node, allowExpressionBody, false);
+
+    this.yieldPos = oldYieldPos;
+    this.awaitPos = oldAwaitPos;
+    this.awaitIdentPos = oldAwaitIdentPos;
+    return this.finishNode(node, (statement & FUNC_STATEMENT) ? "FunctionDeclaration" : "FunctionExpression")
+  };
+
+  pp$1.parseFunctionParams = function(node) {
+    this.expect(types.parenL);
+    node.params = this.parseBindingList(types.parenR, false, this.options.ecmaVersion >= 8);
+    this.checkYieldAwaitInDefaultParams();
+  };
+
+  // Parse a class declaration or literal (depending on the
+  // `isStatement` parameter).
+
+  pp$1.parseClass = function(node, isStatement) {
+    this.next();
+
+    // ecma-262 14.6 Class Definitions
+    // A class definition is always strict mode code.
+    var oldStrict = this.strict;
+    this.strict = true;
+
+    this.parseClassId(node, isStatement);
+    this.parseClassSuper(node);
+    var classBody = this.startNode();
+    var hadConstructor = false;
+    classBody.body = [];
+    this.expect(types.braceL);
+    while (!this.eat(types.braceR)) {
+      var element = this.parseClassElement(node.superClass !== null);
+      if (element) {
+        classBody.body.push(element);
+        if (element.type === "MethodDefinition" && element.kind === "constructor") {
+          if (hadConstructor) { this.raise(element.start, "Duplicate constructor in the same class"); }
+          hadConstructor = true;
+        }
+      }
+    }
+    node.body = this.finishNode(classBody, "ClassBody");
+    this.strict = oldStrict;
+    return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression")
+  };
+
+  pp$1.parseClassElement = function(constructorAllowsSuper) {
+    var this$1 = this;
+
+    if (this.eat(types.semi)) { return null }
+
+    var method = this.startNode();
+    var tryContextual = function (k, noLineBreak) {
+      if ( noLineBreak === void 0 ) noLineBreak = false;
+
+      var start = this$1.start, startLoc = this$1.startLoc;
+      if (!this$1.eatContextual(k)) { return false }
+      if (this$1.type !== types.parenL && (!noLineBreak || !this$1.canInsertSemicolon())) { return true }
+      if (method.key) { this$1.unexpected(); }
+      method.computed = false;
+      method.key = this$1.startNodeAt(start, startLoc);
+      method.key.name = k;
+      this$1.finishNode(method.key, "Identifier");
+      return false
+    };
+
+    method.kind = "method";
+    method.static = tryContextual("static");
+    var isGenerator = this.eat(types.star);
+    var isAsync = false;
+    if (!isGenerator) {
+      if (this.options.ecmaVersion >= 8 && tryContextual("async", true)) {
+        isAsync = true;
+        isGenerator = this.options.ecmaVersion >= 9 && this.eat(types.star);
+      } else if (tryContextual("get")) {
+        method.kind = "get";
+      } else if (tryContextual("set")) {
+        method.kind = "set";
+      }
+    }
+    if (!method.key) { this.parsePropertyName(method); }
+    var key = method.key;
+    var allowsDirectSuper = false;
+    if (!method.computed && !method.static && (key.type === "Identifier" && key.name === "constructor" ||
+        key.type === "Literal" && key.value === "constructor")) {
+      if (method.kind !== "method") { this.raise(key.start, "Constructor can't have get/set modifier"); }
+      if (isGenerator) { this.raise(key.start, "Constructor can't be a generator"); }
+      if (isAsync) { this.raise(key.start, "Constructor can't be an async method"); }
+      method.kind = "constructor";
+      allowsDirectSuper = constructorAllowsSuper;
+    } else if (method.static && key.type === "Identifier" && key.name === "prototype") {
+      this.raise(key.start, "Classes may not have a static property named prototype");
+    }
+    this.parseClassMethod(method, isGenerator, isAsync, allowsDirectSuper);
+    if (method.kind === "get" && method.value.params.length !== 0)
+      { this.raiseRecoverable(method.value.start, "getter should have no params"); }
+    if (method.kind === "set" && method.value.params.length !== 1)
+      { this.raiseRecoverable(method.value.start, "setter should have exactly one param"); }
+    if (method.kind === "set" && method.value.params[0].type === "RestElement")
+      { this.raiseRecoverable(method.value.params[0].start, "Setter cannot use rest params"); }
+    return method
+  };
+
+  pp$1.parseClassMethod = function(method, isGenerator, isAsync, allowsDirectSuper) {
+    method.value = this.parseMethod(isGenerator, isAsync, allowsDirectSuper);
+    return this.finishNode(method, "MethodDefinition")
+  };
+
+  pp$1.parseClassId = function(node, isStatement) {
+    if (this.type === types.name) {
+      node.id = this.parseIdent();
+      if (isStatement)
+        { this.checkLVal(node.id, BIND_LEXICAL, false); }
+    } else {
+      if (isStatement === true)
+        { this.unexpected(); }
+      node.id = null;
+    }
+  };
+
+  pp$1.parseClassSuper = function(node) {
+    node.superClass = this.eat(types._extends) ? this.parseExprSubscripts() : null;
+  };
+
+  // Parses module export declaration.
+
+  pp$1.parseExport = function(node, exports) {
+    this.next();
+    // export * from '...'
+    if (this.eat(types.star)) {
+      this.expectContextual("from");
+      if (this.type !== types.string) { this.unexpected(); }
+      node.source = this.parseExprAtom();
+      this.semicolon();
+      return this.finishNode(node, "ExportAllDeclaration")
+    }
+    if (this.eat(types._default)) { // export default ...
+      this.checkExport(exports, "default", this.lastTokStart);
+      var isAsync;
+      if (this.type === types._function || (isAsync = this.isAsyncFunction())) {
+        var fNode = this.startNode();
+        this.next();
+        if (isAsync) { this.next(); }
+        node.declaration = this.parseFunction(fNode, FUNC_STATEMENT | FUNC_NULLABLE_ID, false, isAsync);
+      } else if (this.type === types._class) {
+        var cNode = this.startNode();
+        node.declaration = this.parseClass(cNode, "nullableID");
+      } else {
+        node.declaration = this.parseMaybeAssign();
+        this.semicolon();
+      }
+      return this.finishNode(node, "ExportDefaultDeclaration")
+    }
+    // export var|const|let|function|class ...
+    if (this.shouldParseExportStatement()) {
+      node.declaration = this.parseStatement(null);
+      if (node.declaration.type === "VariableDeclaration")
+        { this.checkVariableExport(exports, node.declaration.declarations); }
+      else
+        { this.checkExport(exports, node.declaration.id.name, node.declaration.id.start); }
+      node.specifiers = [];
+      node.source = null;
+    } else { // export { x, y as z } [from '...']
+      node.declaration = null;
+      node.specifiers = this.parseExportSpecifiers(exports);
+      if (this.eatContextual("from")) {
+        if (this.type !== types.string) { this.unexpected(); }
+        node.source = this.parseExprAtom();
+      } else {
+        for (var i = 0, list = node.specifiers; i < list.length; i += 1) {
+          // check for keywords used as local names
+          var spec = list[i];
+
+          this.checkUnreserved(spec.local);
+          // check if export is defined
+          this.checkLocalExport(spec.local);
+        }
+
+        node.source = null;
+      }
+      this.semicolon();
+    }
+    return this.finishNode(node, "ExportNamedDeclaration")
+  };
+
+  pp$1.checkExport = function(exports, name, pos) {
+    if (!exports) { return }
+    if (has(exports, name))
+      { this.raiseRecoverable(pos, "Duplicate export '" + name + "'"); }
+    exports[name] = true;
+  };
+
+  pp$1.checkPatternExport = function(exports, pat) {
+    var type = pat.type;
+    if (type === "Identifier")
+      { this.checkExport(exports, pat.name, pat.start); }
+    else if (type === "ObjectPattern")
+      { for (var i = 0, list = pat.properties; i < list.length; i += 1)
+        {
+          var prop = list[i];
+
+          this.checkPatternExport(exports, prop);
+        } }
+    else if (type === "ArrayPattern")
+      { for (var i$1 = 0, list$1 = pat.elements; i$1 < list$1.length; i$1 += 1) {
+        var elt = list$1[i$1];
+
+          if (elt) { this.checkPatternExport(exports, elt); }
+      } }
+    else if (type === "Property")
+      { this.checkPatternExport(exports, pat.value); }
+    else if (type === "AssignmentPattern")
+      { this.checkPatternExport(exports, pat.left); }
+    else if (type === "RestElement")
+      { this.checkPatternExport(exports, pat.argument); }
+    else if (type === "ParenthesizedExpression")
+      { this.checkPatternExport(exports, pat.expression); }
+  };
+
+  pp$1.checkVariableExport = function(exports, decls) {
+    if (!exports) { return }
+    for (var i = 0, list = decls; i < list.length; i += 1)
+      {
+      var decl = list[i];
+
+      this.checkPatternExport(exports, decl.id);
+    }
+  };
+
+  pp$1.shouldParseExportStatement = function() {
+    return this.type.keyword === "var" ||
+      this.type.keyword === "const" ||
+      this.type.keyword === "class" ||
+      this.type.keyword === "function" ||
+      this.isLet() ||
+      this.isAsyncFunction()
+  };
+
+  // Parses a comma-separated list of module exports.
+
+  pp$1.parseExportSpecifiers = function(exports) {
+    var nodes = [], first = true;
+    // export { x, y as z } [from '...']
+    this.expect(types.braceL);
+    while (!this.eat(types.braceR)) {
+      if (!first) {
+        this.expect(types.comma);
+        if (this.afterTrailingComma(types.braceR)) { break }
+      } else { first = false; }
+
+      var node = this.startNode();
+      node.local = this.parseIdent(true);
+      node.exported = this.eatContextual("as") ? this.parseIdent(true) : node.local;
+      this.checkExport(exports, node.exported.name, node.exported.start);
+      nodes.push(this.finishNode(node, "ExportSpecifier"));
+    }
+    return nodes
+  };
+
+  // Parses import declaration.
+
+  pp$1.parseImport = function(node) {
+    this.next();
+    // import '...'
+    if (this.type === types.string) {
+      node.specifiers = empty;
+      node.source = this.parseExprAtom();
+    } else {
+      node.specifiers = this.parseImportSpecifiers();
+      this.expectContextual("from");
+      node.source = this.type === types.string ? this.parseExprAtom() : this.unexpected();
+    }
+    this.semicolon();
+    return this.finishNode(node, "ImportDeclaration")
+  };
+
+  // Parses a comma-separated list of module imports.
+
+  pp$1.parseImportSpecifiers = function() {
+    var nodes = [], first = true;
+    if (this.type === types.name) {
+      // import defaultObj, { x, y as z } from '...'
+      var node = this.startNode();
+      node.local = this.parseIdent();
+      this.checkLVal(node.local, BIND_LEXICAL);
+      nodes.push(this.finishNode(node, "ImportDefaultSpecifier"));
+      if (!this.eat(types.comma)) { return nodes }
+    }
+    if (this.type === types.star) {
+      var node$1 = this.startNode();
+      this.next();
+      this.expectContextual("as");
+      node$1.local = this.parseIdent();
+      this.checkLVal(node$1.local, BIND_LEXICAL);
+      nodes.push(this.finishNode(node$1, "ImportNamespaceSpecifier"));
+      return nodes
+    }
+    this.expect(types.braceL);
+    while (!this.eat(types.braceR)) {
+      if (!first) {
+        this.expect(types.comma);
+        if (this.afterTrailingComma(types.braceR)) { break }
+      } else { first = false; }
+
+      var node$2 = this.startNode();
+      node$2.imported = this.parseIdent(true);
+      if (this.eatContextual("as")) {
+        node$2.local = this.parseIdent();
+      } else {
+        this.checkUnreserved(node$2.imported);
+        node$2.local = node$2.imported;
+      }
+      this.checkLVal(node$2.local, BIND_LEXICAL);
+      nodes.push(this.finishNode(node$2, "ImportSpecifier"));
+    }
+    return nodes
+  };
+
+  // Set `ExpressionStatement#directive` property for directive prologues.
+  pp$1.adaptDirectivePrologue = function(statements) {
+    for (var i = 0; i < statements.length && this.isDirectiveCandidate(statements[i]); ++i) {
+      statements[i].directive = statements[i].expression.raw.slice(1, -1);
+    }
+  };
+  pp$1.isDirectiveCandidate = function(statement) {
+    return (
+      statement.type === "ExpressionStatement" &&
+      statement.expression.type === "Literal" &&
+      typeof statement.expression.value === "string" &&
+      // Reject parenthesized strings.
+      (this.input[statement.start] === "\"" || this.input[statement.start] === "'")
+    )
+  };
+
+  var pp$2 = Parser.prototype;
+
+  // Convert existing expression atom to assignable pattern
+  // if possible.
+
+  pp$2.toAssignable = function(node, isBinding, refDestructuringErrors) {
+    if (this.options.ecmaVersion >= 6 && node) {
+      switch (node.type) {
+      case "Identifier":
+        if (this.inAsync && node.name === "await")
+          { this.raise(node.start, "Cannot use 'await' as identifier inside an async function"); }
+        break
+
+      case "ObjectPattern":
+      case "ArrayPattern":
+      case "RestElement":
+        break
+
+      case "ObjectExpression":
+        node.type = "ObjectPattern";
+        if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
+        for (var i = 0, list = node.properties; i < list.length; i += 1) {
+          var prop = list[i];
+
+        this.toAssignable(prop, isBinding);
+          // Early error:
+          //   AssignmentRestProperty[Yield, Await] :
+          //     `...` DestructuringAssignmentTarget[Yield, Await]
+          //
+          //   It is a Syntax Error if |DestructuringAssignmentTarget| is an |ArrayLiteral| or an |ObjectLiteral|.
+          if (
+            prop.type === "RestElement" &&
+            (prop.argument.type === "ArrayPattern" || prop.argument.type === "ObjectPattern")
+          ) {
+            this.raise(prop.argument.start, "Unexpected token");
+          }
+        }
+        break
+
+      case "Property":
+        // AssignmentProperty has type === "Property"
+        if (node.kind !== "init") { this.raise(node.key.start, "Object pattern can't contain getter or setter"); }
+        this.toAssignable(node.value, isBinding);
+        break
+
+      case "ArrayExpression":
+        node.type = "ArrayPattern";
+        if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
+        this.toAssignableList(node.elements, isBinding);
+        break
+
+      case "SpreadElement":
+        node.type = "RestElement";
+        this.toAssignable(node.argument, isBinding);
+        if (node.argument.type === "AssignmentPattern")
+          { this.raise(node.argument.start, "Rest elements cannot have a default value"); }
+        break
+
+      case "AssignmentExpression":
+        if (node.operator !== "=") { this.raise(node.left.end, "Only '=' operator can be used for specifying default value."); }
+        node.type = "AssignmentPattern";
+        delete node.operator;
+        this.toAssignable(node.left, isBinding);
+        // falls through to AssignmentPattern
+
+      case "AssignmentPattern":
+        break
+
+      case "ParenthesizedExpression":
+        this.toAssignable(node.expression, isBinding, refDestructuringErrors);
+        break
+
+      case "MemberExpression":
+        if (!isBinding) { break }
+
+      default:
+        this.raise(node.start, "Assigning to rvalue");
+      }
+    } else if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
+    return node
+  };
+
+  // Convert list of expression atoms to binding list.
+
+  pp$2.toAssignableList = function(exprList, isBinding) {
+    var end = exprList.length;
+    for (var i = 0; i < end; i++) {
+      var elt = exprList[i];
+      if (elt) { this.toAssignable(elt, isBinding); }
+    }
+    if (end) {
+      var last = exprList[end - 1];
+      if (this.options.ecmaVersion === 6 && isBinding && last && last.type === "RestElement" && last.argument.type !== "Identifier")
+        { this.unexpected(last.argument.start); }
+    }
+    return exprList
+  };
+
+  // Parses spread element.
+
+  pp$2.parseSpread = function(refDestructuringErrors) {
+    var node = this.startNode();
+    this.next();
+    node.argument = this.parseMaybeAssign(false, refDestructuringErrors);
+    return this.finishNode(node, "SpreadElement")
+  };
+
+  pp$2.parseRestBinding = function() {
+    var node = this.startNode();
+    this.next();
+
+    // RestElement inside of a function parameter must be an identifier
+    if (this.options.ecmaVersion === 6 && this.type !== types.name)
+      { this.unexpected(); }
+
+    node.argument = this.parseBindingAtom();
+
+    return this.finishNode(node, "RestElement")
+  };
+
+  // Parses lvalue (assignable) atom.
+
+  pp$2.parseBindingAtom = function() {
+    if (this.options.ecmaVersion >= 6) {
+      switch (this.type) {
+      case types.bracketL:
+        var node = this.startNode();
+        this.next();
+        node.elements = this.parseBindingList(types.bracketR, true, true);
+        return this.finishNode(node, "ArrayPattern")
+
+      case types.braceL:
+        return this.parseObj(true)
+      }
+    }
+    return this.parseIdent()
+  };
+
+  pp$2.parseBindingList = function(close, allowEmpty, allowTrailingComma) {
+    var elts = [], first = true;
+    while (!this.eat(close)) {
+      if (first) { first = false; }
+      else { this.expect(types.comma); }
+      if (allowEmpty && this.type === types.comma) {
+        elts.push(null);
+      } else if (allowTrailingComma && this.afterTrailingComma(close)) {
+        break
+      } else if (this.type === types.ellipsis) {
+        var rest = this.parseRestBinding();
+        this.parseBindingListItem(rest);
+        elts.push(rest);
+        if (this.type === types.comma) { this.raise(this.start, "Comma is not permitted after the rest element"); }
+        this.expect(close);
+        break
+      } else {
+        var elem = this.parseMaybeDefault(this.start, this.startLoc);
+        this.parseBindingListItem(elem);
+        elts.push(elem);
+      }
+    }
+    return elts
+  };
+
+  pp$2.parseBindingListItem = function(param) {
+    return param
+  };
+
+  // Parses assignment pattern around given atom if possible.
+
+  pp$2.parseMaybeDefault = function(startPos, startLoc, left) {
+    left = left || this.parseBindingAtom();
+    if (this.options.ecmaVersion < 6 || !this.eat(types.eq)) { return left }
+    var node = this.startNodeAt(startPos, startLoc);
+    node.left = left;
+    node.right = this.parseMaybeAssign();
+    return this.finishNode(node, "AssignmentPattern")
+  };
+
+  // Verify that a node is an lval — something that can be assigned
+  // to.
+  // bindingType can be either:
+  // 'var' indicating that the lval creates a 'var' binding
+  // 'let' indicating that the lval creates a lexical ('let' or 'const') binding
+  // 'none' indicating that the binding should be checked for illegal identifiers, but not for duplicate references
+
+  pp$2.checkLVal = function(expr, bindingType, checkClashes) {
+    if ( bindingType === void 0 ) bindingType = BIND_NONE;
+
+    switch (expr.type) {
+    case "Identifier":
+      if (bindingType === BIND_LEXICAL && expr.name === "let")
+        { this.raiseRecoverable(expr.start, "let is disallowed as a lexically bound name"); }
+      if (this.strict && this.reservedWordsStrictBind.test(expr.name))
+        { this.raiseRecoverable(expr.start, (bindingType ? "Binding " : "Assigning to ") + expr.name + " in strict mode"); }
+      if (checkClashes) {
+        if (has(checkClashes, expr.name))
+          { this.raiseRecoverable(expr.start, "Argument name clash"); }
+        checkClashes[expr.name] = true;
+      }
+      if (bindingType !== BIND_NONE && bindingType !== BIND_OUTSIDE) { this.declareName(expr.name, bindingType, expr.start); }
+      break
+
+    case "MemberExpression":
+      if (bindingType) { this.raiseRecoverable(expr.start, "Binding member expression"); }
+      break
+
+    case "ObjectPattern":
+      for (var i = 0, list = expr.properties; i < list.length; i += 1)
+        {
+      var prop = list[i];
+
+      this.checkLVal(prop, bindingType, checkClashes);
+    }
+      break
+
+    case "Property":
+      // AssignmentProperty has type === "Property"
+      this.checkLVal(expr.value, bindingType, checkClashes);
+      break
+
+    case "ArrayPattern":
+      for (var i$1 = 0, list$1 = expr.elements; i$1 < list$1.length; i$1 += 1) {
+        var elem = list$1[i$1];
+
+      if (elem) { this.checkLVal(elem, bindingType, checkClashes); }
+      }
+      break
+
+    case "AssignmentPattern":
+      this.checkLVal(expr.left, bindingType, checkClashes);
+      break
+
+    case "RestElement":
+      this.checkLVal(expr.argument, bindingType, checkClashes);
+      break
+
+    case "ParenthesizedExpression":
+      this.checkLVal(expr.expression, bindingType, checkClashes);
+      break
+
+    default:
+      this.raise(expr.start, (bindingType ? "Binding" : "Assigning to") + " rvalue");
+    }
+  };
+
+  // A recursive descent parser operates by defining functions for all
+
+  var pp$3 = Parser.prototype;
+
+  // Check if property name clashes with already added.
+  // Object/class getters and setters are not allowed to clash —
+  // either with each other or with an init property — and in
+  // strict mode, init properties are also not allowed to be repeated.
+
+  pp$3.checkPropClash = function(prop, propHash, refDestructuringErrors) {
+    if (this.options.ecmaVersion >= 9 && prop.type === "SpreadElement")
+      { return }
+    if (this.options.ecmaVersion >= 6 && (prop.computed || prop.method || prop.shorthand))
+      { return }
+    var key = prop.key;
+    var name;
+    switch (key.type) {
+    case "Identifier": name = key.name; break
+    case "Literal": name = String(key.value); break
+    default: return
+    }
+    var kind = prop.kind;
+    if (this.options.ecmaVersion >= 6) {
+      if (name === "__proto__" && kind === "init") {
+        if (propHash.proto) {
+          if (refDestructuringErrors && refDestructuringErrors.doubleProto < 0) { refDestructuringErrors.doubleProto = key.start; }
+          // Backwards-compat kludge. Can be removed in version 6.0
+          else { this.raiseRecoverable(key.start, "Redefinition of __proto__ property"); }
+        }
+        propHash.proto = true;
+      }
+      return
+    }
+    name = "$" + name;
+    var other = propHash[name];
+    if (other) {
+      var redefinition;
+      if (kind === "init") {
+        redefinition = this.strict && other.init || other.get || other.set;
+      } else {
+        redefinition = other.init || other[kind];
+      }
+      if (redefinition)
+        { this.raiseRecoverable(key.start, "Redefinition of property"); }
+    } else {
+      other = propHash[name] = {
+        init: false,
+        get: false,
+        set: false
+      };
+    }
+    other[kind] = true;
+  };
+
+  // ### Expression parsing
+
+  // These nest, from the most general expression type at the top to
+  // 'atomic', nondivisible expression types at the bottom. Most of
+  // the functions will simply let the function(s) below them parse,
+  // and, *if* the syntactic construct they handle is present, wrap
+  // the AST node that the inner parser gave them in another node.
+
+  // Parse a full expression. The optional arguments are used to
+  // forbid the `in` operator (in for loops initalization expressions)
+  // and provide reference for storing '=' operator inside shorthand
+  // property assignment in contexts where both object expression
+  // and object pattern might appear (so it's possible to raise
+  // delayed syntax error at correct position).
+
+  pp$3.parseExpression = function(noIn, refDestructuringErrors) {
+    var startPos = this.start, startLoc = this.startLoc;
+    var expr = this.parseMaybeAssign(noIn, refDestructuringErrors);
+    if (this.type === types.comma) {
+      var node = this.startNodeAt(startPos, startLoc);
+      node.expressions = [expr];
+      while (this.eat(types.comma)) { node.expressions.push(this.parseMaybeAssign(noIn, refDestructuringErrors)); }
+      return this.finishNode(node, "SequenceExpression")
+    }
+    return expr
+  };
+
+  // Parse an assignment expression. This includes applications of
+  // operators like `+=`.
+
+  pp$3.parseMaybeAssign = function(noIn, refDestructuringErrors, afterLeftParse) {
+    if (this.isContextual("yield")) {
+      if (this.inGenerator) { return this.parseYield(noIn) }
+      // The tokenizer will assume an expression is allowed after
+      // `yield`, but this isn't that kind of yield
+      else { this.exprAllowed = false; }
+    }
+
+    var ownDestructuringErrors = false, oldParenAssign = -1, oldTrailingComma = -1, oldShorthandAssign = -1;
+    if (refDestructuringErrors) {
+      oldParenAssign = refDestructuringErrors.parenthesizedAssign;
+      oldTrailingComma = refDestructuringErrors.trailingComma;
+      oldShorthandAssign = refDestructuringErrors.shorthandAssign;
+      refDestructuringErrors.parenthesizedAssign = refDestructuringErrors.trailingComma = refDestructuringErrors.shorthandAssign = -1;
+    } else {
+      refDestructuringErrors = new DestructuringErrors;
+      ownDestructuringErrors = true;
+    }
+
+    var startPos = this.start, startLoc = this.startLoc;
+    if (this.type === types.parenL || this.type === types.name)
+      { this.potentialArrowAt = this.start; }
+    var left = this.parseMaybeConditional(noIn, refDestructuringErrors);
+    if (afterLeftParse) { left = afterLeftParse.call(this, left, startPos, startLoc); }
+    if (this.type.isAssign) {
+      var node = this.startNodeAt(startPos, startLoc);
+      node.operator = this.value;
+      node.left = this.type === types.eq ? this.toAssignable(left, false, refDestructuringErrors) : left;
+      if (!ownDestructuringErrors) { DestructuringErrors.call(refDestructuringErrors); }
+      refDestructuringErrors.shorthandAssign = -1; // reset because shorthand default was used correctly
+      this.checkLVal(left);
+      this.next();
+      node.right = this.parseMaybeAssign(noIn);
+      return this.finishNode(node, "AssignmentExpression")
+    } else {
+      if (ownDestructuringErrors) { this.checkExpressionErrors(refDestructuringErrors, true); }
+    }
+    if (oldParenAssign > -1) { refDestructuringErrors.parenthesizedAssign = oldParenAssign; }
+    if (oldTrailingComma > -1) { refDestructuringErrors.trailingComma = oldTrailingComma; }
+    if (oldShorthandAssign > -1) { refDestructuringErrors.shorthandAssign = oldShorthandAssign; }
+    return left
+  };
+
+  // Parse a ternary conditional (`?:`) operator.
+
+  pp$3.parseMaybeConditional = function(noIn, refDestructuringErrors) {
+    var startPos = this.start, startLoc = this.startLoc;
+    var expr = this.parseExprOps(noIn, refDestructuringErrors);
+    if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
+    if (this.eat(types.question)) {
+      var node = this.startNodeAt(startPos, startLoc);
+      node.test = expr;
+      node.consequent = this.parseMaybeAssign();
+      this.expect(types.colon);
+      node.alternate = this.parseMaybeAssign(noIn);
+      return this.finishNode(node, "ConditionalExpression")
+    }
+    return expr
+  };
+
+  // Start the precedence parser.
+
+  pp$3.parseExprOps = function(noIn, refDestructuringErrors) {
+    var startPos = this.start, startLoc = this.startLoc;
+    var expr = this.parseMaybeUnary(refDestructuringErrors, false);
+    if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
+    return expr.start === startPos && expr.type === "ArrowFunctionExpression" ? expr : this.parseExprOp(expr, startPos, startLoc, -1, noIn)
+  };
+
+  // Parse binary operators with the operator precedence parsing
+  // algorithm. `left` is the left-hand side of the operator.
+  // `minPrec` provides context that allows the function to stop and
+  // defer further parser to one of its callers when it encounters an
+  // operator that has a lower precedence than the set it is parsing.
+
+  pp$3.parseExprOp = function(left, leftStartPos, leftStartLoc, minPrec, noIn) {
+    var prec = this.type.binop;
+    if (prec != null && (!noIn || this.type !== types._in)) {
+      if (prec > minPrec) {
+        var logical = this.type === types.logicalOR || this.type === types.logicalAND;
+        var op = this.value;
+        this.next();
+        var startPos = this.start, startLoc = this.startLoc;
+        var right = this.parseExprOp(this.parseMaybeUnary(null, false), startPos, startLoc, prec, noIn);
+        var node = this.buildBinary(leftStartPos, leftStartLoc, left, right, op, logical);
+        return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn)
+      }
+    }
+    return left
+  };
+
+  pp$3.buildBinary = function(startPos, startLoc, left, right, op, logical) {
+    var node = this.startNodeAt(startPos, startLoc);
+    node.left = left;
+    node.operator = op;
+    node.right = right;
+    return this.finishNode(node, logical ? "LogicalExpression" : "BinaryExpression")
+  };
+
+  // Parse unary operators, both prefix and postfix.
+
+  pp$3.parseMaybeUnary = function(refDestructuringErrors, sawUnary) {
+    var startPos = this.start, startLoc = this.startLoc, expr;
+    if (this.isContextual("await") && (this.inAsync || (!this.inFunction && this.options.allowAwaitOutsideFunction))) {
+      expr = this.parseAwait();
+      sawUnary = true;
+    } else if (this.type.prefix) {
+      var node = this.startNode(), update = this.type === types.incDec;
+      node.operator = this.value;
+      node.prefix = true;
+      this.next();
+      node.argument = this.parseMaybeUnary(null, true);
+      this.checkExpressionErrors(refDestructuringErrors, true);
+      if (update) { this.checkLVal(node.argument); }
+      else if (this.strict && node.operator === "delete" &&
+               node.argument.type === "Identifier")
+        { this.raiseRecoverable(node.start, "Deleting local variable in strict mode"); }
+      else { sawUnary = true; }
+      expr = this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
+    } else {
+      expr = this.parseExprSubscripts(refDestructuringErrors);
+      if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
+      while (this.type.postfix && !this.canInsertSemicolon()) {
+        var node$1 = this.startNodeAt(startPos, startLoc);
+        node$1.operator = this.value;
+        node$1.prefix = false;
+        node$1.argument = expr;
+        this.checkLVal(expr);
+        this.next();
+        expr = this.finishNode(node$1, "UpdateExpression");
+      }
+    }
+
+    if (!sawUnary && this.eat(types.starstar))
+      { return this.buildBinary(startPos, startLoc, expr, this.parseMaybeUnary(null, false), "**", false) }
+    else
+      { return expr }
+  };
+
+  // Parse call, dot, and `[]`-subscript expressions.
+
+  pp$3.parseExprSubscripts = function(refDestructuringErrors) {
+    var startPos = this.start, startLoc = this.startLoc;
+    var expr = this.parseExprAtom(refDestructuringErrors);
+    var skipArrowSubscripts = expr.type === "ArrowFunctionExpression" && this.input.slice(this.lastTokStart, this.lastTokEnd) !== ")";
+    if (this.checkExpressionErrors(refDestructuringErrors) || skipArrowSubscripts) { return expr }
+    var result = this.parseSubscripts(expr, startPos, startLoc);
+    if (refDestructuringErrors && result.type === "MemberExpression") {
+      if (refDestructuringErrors.parenthesizedAssign >= result.start) { refDestructuringErrors.parenthesizedAssign = -1; }
+      if (refDestructuringErrors.parenthesizedBind >= result.start) { refDestructuringErrors.parenthesizedBind = -1; }
+    }
+    return result
+  };
+
+  pp$3.parseSubscripts = function(base, startPos, startLoc, noCalls) {
+    var maybeAsyncArrow = this.options.ecmaVersion >= 8 && base.type === "Identifier" && base.name === "async" &&
+        this.lastTokEnd === base.end && !this.canInsertSemicolon() && this.input.slice(base.start, base.end) === "async";
+    while (true) {
+      var element = this.parseSubscript(base, startPos, startLoc, noCalls, maybeAsyncArrow);
+      if (element === base || element.type === "ArrowFunctionExpression") { return element }
+      base = element;
+    }
+  };
+
+  pp$3.parseSubscript = function(base, startPos, startLoc, noCalls, maybeAsyncArrow) {
+    var computed = this.eat(types.bracketL);
+    if (computed || this.eat(types.dot)) {
+      var node = this.startNodeAt(startPos, startLoc);
+      node.object = base;
+      node.property = computed ? this.parseExpression() : this.parseIdent(true);
+      node.computed = !!computed;
+      if (computed) { this.expect(types.bracketR); }
+      base = this.finishNode(node, "MemberExpression");
+    } else if (!noCalls && this.eat(types.parenL)) {
+      var refDestructuringErrors = new DestructuringErrors, oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
+      this.yieldPos = 0;
+      this.awaitPos = 0;
+      this.awaitIdentPos = 0;
+      var exprList = this.parseExprList(types.parenR, this.options.ecmaVersion >= 8 && base.type !== "Import", false, refDestructuringErrors);
+      if (maybeAsyncArrow && !this.canInsertSemicolon() && this.eat(types.arrow)) {
+        this.checkPatternErrors(refDestructuringErrors, false);
+        this.checkYieldAwaitInDefaultParams();
+        if (this.awaitIdentPos > 0)
+          { this.raise(this.awaitIdentPos, "Cannot use 'await' as identifier inside an async function"); }
+        this.yieldPos = oldYieldPos;
+        this.awaitPos = oldAwaitPos;
+        this.awaitIdentPos = oldAwaitIdentPos;
+        return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList, true)
+      }
+      this.checkExpressionErrors(refDestructuringErrors, true);
+      this.yieldPos = oldYieldPos || this.yieldPos;
+      this.awaitPos = oldAwaitPos || this.awaitPos;
+      this.awaitIdentPos = oldAwaitIdentPos || this.awaitIdentPos;
+      var node$1 = this.startNodeAt(startPos, startLoc);
+      node$1.callee = base;
+      node$1.arguments = exprList;
+      if (node$1.callee.type === "Import") {
+        if (node$1.arguments.length !== 1) {
+          this.raise(node$1.start, "import() requires exactly one argument");
+        }
+
+        var importArg = node$1.arguments[0];
+        if (importArg && importArg.type === "SpreadElement") {
+          this.raise(importArg.start, "... is not allowed in import()");
+        }
+      }
+      base = this.finishNode(node$1, "CallExpression");
+    } else if (this.type === types.backQuote) {
+      var node$2 = this.startNodeAt(startPos, startLoc);
+      node$2.tag = base;
+      node$2.quasi = this.parseTemplate({isTagged: true});
+      base = this.finishNode(node$2, "TaggedTemplateExpression");
+    }
+    return base
+  };
+
+  // Parse an atomic expression — either a single token that is an
+  // expression, an expression started by a keyword like `function` or
+  // `new`, or an expression wrapped in punctuation like `()`, `[]`,
+  // or `{}`.
+
+  pp$3.parseExprAtom = function(refDestructuringErrors) {
+    // If a division operator appears in an expression position, the
+    // tokenizer got confused, and we force it to read a regexp instead.
+    if (this.type === types.slash) { this.readRegexp(); }
+
+    var node, canBeArrow = this.potentialArrowAt === this.start;
+    switch (this.type) {
+    case types._super:
+      if (!this.allowSuper)
+        { this.raise(this.start, "'super' keyword outside a method"); }
+      node = this.startNode();
+      this.next();
+      if (this.type === types.parenL && !this.allowDirectSuper)
+        { this.raise(node.start, "super() call outside constructor of a subclass"); }
+      // The `super` keyword can appear at below:
+      // SuperProperty:
+      //     super [ Expression ]
+      //     super . IdentifierName
+      // SuperCall:
+      //     super Arguments
+      if (this.type !== types.dot && this.type !== types.bracketL && this.type !== types.parenL)
+        { this.unexpected(); }
+      return this.finishNode(node, "Super")
+
+    case types._this:
+      node = this.startNode();
+      this.next();
+      return this.finishNode(node, "ThisExpression")
+
+    case types.name:
+      var startPos = this.start, startLoc = this.startLoc, containsEsc = this.containsEsc;
+      var id = this.parseIdent(false);
+      if (this.options.ecmaVersion >= 8 && !containsEsc && id.name === "async" && !this.canInsertSemicolon() && this.eat(types._function))
+        { return this.parseFunction(this.startNodeAt(startPos, startLoc), 0, false, true) }
+      if (canBeArrow && !this.canInsertSemicolon()) {
+        if (this.eat(types.arrow))
+          { return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], false) }
+        if (this.options.ecmaVersion >= 8 && id.name === "async" && this.type === types.name && !containsEsc) {
+          id = this.parseIdent(false);
+          if (this.canInsertSemicolon() || !this.eat(types.arrow))
+            { this.unexpected(); }
+          return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], true)
+        }
+      }
+      return id
+
+    case types.regexp:
+      var value = this.value;
+      node = this.parseLiteral(value.value);
+      node.regex = {pattern: value.pattern, flags: value.flags};
+      return node
+
+    case types.num: case types.string:
+      return this.parseLiteral(this.value)
+
+    case types._null: case types._true: case types._false:
+      node = this.startNode();
+      node.value = this.type === types._null ? null : this.type === types._true;
+      node.raw = this.type.keyword;
+      this.next();
+      return this.finishNode(node, "Literal")
+
+    case types.parenL:
+      var start = this.start, expr = this.parseParenAndDistinguishExpression(canBeArrow);
+      if (refDestructuringErrors) {
+        if (refDestructuringErrors.parenthesizedAssign < 0 && !this.isSimpleAssignTarget(expr))
+          { refDestructuringErrors.parenthesizedAssign = start; }
+        if (refDestructuringErrors.parenthesizedBind < 0)
+          { refDestructuringErrors.parenthesizedBind = start; }
+      }
+      return expr
+
+    case types.bracketL:
+      node = this.startNode();
+      this.next();
+      node.elements = this.parseExprList(types.bracketR, true, true, refDestructuringErrors);
+      return this.finishNode(node, "ArrayExpression")
+
+    case types.braceL:
+      return this.parseObj(false, refDestructuringErrors)
+
+    case types._function:
+      node = this.startNode();
+      this.next();
+      return this.parseFunction(node, 0)
+
+    case types._class:
+      return this.parseClass(this.startNode(), false)
+
+    case types._new:
+      return this.parseNew()
+
+    case types.backQuote:
+      return this.parseTemplate()
+
+    case types._import:
+      if (this.options.ecmaVersion > 10) {
+        return this.parseDynamicImport()
+      } else {
+        return this.unexpected()
+      }
+
+    default:
+      this.unexpected();
+    }
+  };
+
+  pp$3.parseDynamicImport = function() {
+    var node = this.startNode();
+    this.next();
+    if (this.type !== types.parenL) {
+      this.unexpected();
+    }
+    return this.finishNode(node, "Import")
+  };
+
+  pp$3.parseLiteral = function(value) {
+    var node = this.startNode();
+    node.value = value;
+    node.raw = this.input.slice(this.start, this.end);
+    if (node.raw.charCodeAt(node.raw.length - 1) === 110) { node.bigint = node.raw.slice(0, -1); }
+    this.next();
+    return this.finishNode(node, "Literal")
+  };
+
+  pp$3.parseParenExpression = function() {
+    this.expect(types.parenL);
+    var val = this.parseExpression();
+    this.expect(types.parenR);
+    return val
+  };
+
+  pp$3.parseParenAndDistinguishExpression = function(canBeArrow) {
+    var startPos = this.start, startLoc = this.startLoc, val, allowTrailingComma = this.options.ecmaVersion >= 8;
+    if (this.options.ecmaVersion >= 6) {
+      this.next();
+
+      var innerStartPos = this.start, innerStartLoc = this.startLoc;
+      var exprList = [], first = true, lastIsComma = false;
+      var refDestructuringErrors = new DestructuringErrors, oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, spreadStart;
+      this.yieldPos = 0;
+      this.awaitPos = 0;
+      // Do not save awaitIdentPos to allow checking awaits nested in parameters
+      while (this.type !== types.parenR) {
+        first ? first = false : this.expect(types.comma);
+        if (allowTrailingComma && this.afterTrailingComma(types.parenR, true)) {
+          lastIsComma = true;
+          break
+        } else if (this.type === types.ellipsis) {
+          spreadStart = this.start;
+          exprList.push(this.parseParenItem(this.parseRestBinding()));
+          if (this.type === types.comma) { this.raise(this.start, "Comma is not permitted after the rest element"); }
+          break
+        } else {
+          exprList.push(this.parseMaybeAssign(false, refDestructuringErrors, this.parseParenItem));
+        }
+      }
+      var innerEndPos = this.start, innerEndLoc = this.startLoc;
+      this.expect(types.parenR);
+
+      if (canBeArrow && !this.canInsertSemicolon() && this.eat(types.arrow)) {
+        this.checkPatternErrors(refDestructuringErrors, false);
+        this.checkYieldAwaitInDefaultParams();
+        this.yieldPos = oldYieldPos;
+        this.awaitPos = oldAwaitPos;
+        return this.parseParenArrowList(startPos, startLoc, exprList)
+      }
+
+      if (!exprList.length || lastIsComma) { this.unexpected(this.lastTokStart); }
+      if (spreadStart) { this.unexpected(spreadStart); }
+      this.checkExpressionErrors(refDestructuringErrors, true);
+      this.yieldPos = oldYieldPos || this.yieldPos;
+      this.awaitPos = oldAwaitPos || this.awaitPos;
+
+      if (exprList.length > 1) {
+        val = this.startNodeAt(innerStartPos, innerStartLoc);
+        val.expressions = exprList;
+        this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
+      } else {
+        val = exprList[0];
+      }
+    } else {
+      val = this.parseParenExpression();
+    }
+
+    if (this.options.preserveParens) {
+      var par = this.startNodeAt(startPos, startLoc);
+      par.expression = val;
+      return this.finishNode(par, "ParenthesizedExpression")
+    } else {
+      return val
+    }
+  };
+
+  pp$3.parseParenItem = function(item) {
+    return item
+  };
+
+  pp$3.parseParenArrowList = function(startPos, startLoc, exprList) {
+    return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList)
+  };
+
+  // New's precedence is slightly tricky. It must allow its argument to
+  // be a `[]` or dot subscript expression, but not a call — at least,
+  // not without wrapping it in parentheses. Thus, it uses the noCalls
+  // argument to parseSubscripts to prevent it from consuming the
+  // argument list.
+
+  var empty$1 = [];
+
+  pp$3.parseNew = function() {
+    var node = this.startNode();
+    var meta = this.parseIdent(true);
+    if (this.options.ecmaVersion >= 6 && this.eat(types.dot)) {
+      node.meta = meta;
+      var containsEsc = this.containsEsc;
+      node.property = this.parseIdent(true);
+      if (node.property.name !== "target" || containsEsc)
+        { this.raiseRecoverable(node.property.start, "The only valid meta property for new is new.target"); }
+      if (!this.inNonArrowFunction())
+        { this.raiseRecoverable(node.start, "new.target can only be used in functions"); }
+      return this.finishNode(node, "MetaProperty")
+    }
+    var startPos = this.start, startLoc = this.startLoc;
+    node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
+    if (this.options.ecmaVersion > 10 && node.callee.type === "Import") {
+      this.raise(node.callee.start, "Cannot use new with import(...)");
+    }
+    if (this.eat(types.parenL)) { node.arguments = this.parseExprList(types.parenR, this.options.ecmaVersion >= 8 && node.callee.type !== "Import", false); }
+    else { node.arguments = empty$1; }
+    return this.finishNode(node, "NewExpression")
+  };
+
+  // Parse template expression.
+
+  pp$3.parseTemplateElement = function(ref) {
+    var isTagged = ref.isTagged;
+
+    var elem = this.startNode();
+    if (this.type === types.invalidTemplate) {
+      if (!isTagged) {
+        this.raiseRecoverable(this.start, "Bad escape sequence in untagged template literal");
+      }
+      elem.value = {
+        raw: this.value,
+        cooked: null
+      };
+    } else {
+      elem.value = {
+        raw: this.input.slice(this.start, this.end).replace(/\r\n?/g, "\n"),
+        cooked: this.value
+      };
+    }
+    this.next();
+    elem.tail = this.type === types.backQuote;
+    return this.finishNode(elem, "TemplateElement")
+  };
+
+  pp$3.parseTemplate = function(ref) {
+    if ( ref === void 0 ) ref = {};
+    var isTagged = ref.isTagged; if ( isTagged === void 0 ) isTagged = false;
+
+    var node = this.startNode();
+    this.next();
+    node.expressions = [];
+    var curElt = this.parseTemplateElement({isTagged: isTagged});
+    node.quasis = [curElt];
+    while (!curElt.tail) {
+      if (this.type === types.eof) { this.raise(this.pos, "Unterminated template literal"); }
+      this.expect(types.dollarBraceL);
+      node.expressions.push(this.parseExpression());
+      this.expect(types.braceR);
+      node.quasis.push(curElt = this.parseTemplateElement({isTagged: isTagged}));
+    }
+    this.next();
+    return this.finishNode(node, "TemplateLiteral")
+  };
+
+  pp$3.isAsyncProp = function(prop) {
+    return !prop.computed && prop.key.type === "Identifier" && prop.key.name === "async" &&
+      (this.type === types.name || this.type === types.num || this.type === types.string || this.type === types.bracketL || this.type.keyword || (this.options.ecmaVersion >= 9 && this.type === types.star)) &&
+      !lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
+  };
+
+  // Parse an object literal or binding pattern.
+
+  pp$3.parseObj = function(isPattern, refDestructuringErrors) {
+    var node = this.startNode(), first = true, propHash = {};
+    node.properties = [];
+    this.next();
+    while (!this.eat(types.braceR)) {
+      if (!first) {
+        this.expect(types.comma);
+        if (this.afterTrailingComma(types.braceR)) { break }
+      } else { first = false; }
+
+      var prop = this.parseProperty(isPattern, refDestructuringErrors);
+      if (!isPattern) { this.checkPropClash(prop, propHash, refDestructuringErrors); }
+      node.properties.push(prop);
+    }
+    return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression")
+  };
+
+  pp$3.parseProperty = function(isPattern, refDestructuringErrors) {
+    var prop = this.startNode(), isGenerator, isAsync, startPos, startLoc;
+    if (this.options.ecmaVersion >= 9 && this.eat(types.ellipsis)) {
+      if (isPattern) {
+        prop.argument = this.parseIdent(false);
+        if (this.type === types.comma) {
+          this.raise(this.start, "Comma is not permitted after the rest element");
+        }
+        return this.finishNode(prop, "RestElement")
+      }
+      // To disallow parenthesized identifier via `this.toAssignable()`.
+      if (this.type === types.parenL && refDestructuringErrors) {
+        if (refDestructuringErrors.parenthesizedAssign < 0) {
+          refDestructuringErrors.parenthesizedAssign = this.start;
+        }
+        if (refDestructuringErrors.parenthesizedBind < 0) {
+          refDestructuringErrors.parenthesizedBind = this.start;
+        }
+      }
+      // Parse argument.
+      prop.argument = this.parseMaybeAssign(false, refDestructuringErrors);
+      // To disallow trailing comma via `this.toAssignable()`.
+      if (this.type === types.comma && refDestructuringErrors && refDestructuringErrors.trailingComma < 0) {
+        refDestructuringErrors.trailingComma = this.start;
+      }
+      // Finish
+      return this.finishNode(prop, "SpreadElement")
+    }
+    if (this.options.ecmaVersion >= 6) {
+      prop.method = false;
+      prop.shorthand = false;
+      if (isPattern || refDestructuringErrors) {
+        startPos = this.start;
+        startLoc = this.startLoc;
+      }
+      if (!isPattern)
+        { isGenerator = this.eat(types.star); }
+    }
+    var containsEsc = this.containsEsc;
+    this.parsePropertyName(prop);
+    if (!isPattern && !containsEsc && this.options.ecmaVersion >= 8 && !isGenerator && this.isAsyncProp(prop)) {
+      isAsync = true;
+      isGenerator = this.options.ecmaVersion >= 9 && this.eat(types.star);
+      this.parsePropertyName(prop, refDestructuringErrors);
+    } else {
+      isAsync = false;
+    }
+    this.parsePropertyValue(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc);
+    return this.finishNode(prop, "Property")
+  };
+
+  pp$3.parsePropertyValue = function(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc) {
+    if ((isGenerator || isAsync) && this.type === types.colon)
+      { this.unexpected(); }
+
+    if (this.eat(types.colon)) {
+      prop.value = isPattern ? this.parseMaybeDefault(this.start, this.startLoc) : this.parseMaybeAssign(false, refDestructuringErrors);
+      prop.kind = "init";
+    } else if (this.options.ecmaVersion >= 6 && this.type === types.parenL) {
+      if (isPattern) { this.unexpected(); }
+      prop.kind = "init";
+      prop.method = true;
+      prop.value = this.parseMethod(isGenerator, isAsync);
+    } else if (!isPattern && !containsEsc &&
+               this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" &&
+               (prop.key.name === "get" || prop.key.name === "set") &&
+               (this.type !== types.comma && this.type !== types.braceR)) {
+      if (isGenerator || isAsync) { this.unexpected(); }
+      prop.kind = prop.key.name;
+      this.parsePropertyName(prop);
+      prop.value = this.parseMethod(false);
+      var paramCount = prop.kind === "get" ? 0 : 1;
+      if (prop.value.params.length !== paramCount) {
+        var start = prop.value.start;
+        if (prop.kind === "get")
+          { this.raiseRecoverable(start, "getter should have no params"); }
+        else
+          { this.raiseRecoverable(start, "setter should have exactly one param"); }
+      } else {
+        if (prop.kind === "set" && prop.value.params[0].type === "RestElement")
+          { this.raiseRecoverable(prop.value.params[0].start, "Setter cannot use rest params"); }
+      }
+    } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
+      if (isGenerator || isAsync) { this.unexpected(); }
+      this.checkUnreserved(prop.key);
+      if (prop.key.name === "await" && !this.awaitIdentPos)
+        { this.awaitIdentPos = startPos; }
+      prop.kind = "init";
+      if (isPattern) {
+        prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
+      } else if (this.type === types.eq && refDestructuringErrors) {
+        if (refDestructuringErrors.shorthandAssign < 0)
+          { refDestructuringErrors.shorthandAssign = this.start; }
+        prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
+      } else {
+        prop.value = prop.key;
+      }
+      prop.shorthand = true;
+    } else { this.unexpected(); }
+  };
+
+  pp$3.parsePropertyName = function(prop) {
+    if (this.options.ecmaVersion >= 6) {
+      if (this.eat(types.bracketL)) {
+        prop.computed = true;
+        prop.key = this.parseMaybeAssign();
+        this.expect(types.bracketR);
+        return prop.key
+      } else {
+        prop.computed = false;
+      }
+    }
+    return prop.key = this.type === types.num || this.type === types.string ? this.parseExprAtom() : this.parseIdent(true)
+  };
+
+  // Initialize empty function node.
+
+  pp$3.initFunction = function(node) {
+    node.id = null;
+    if (this.options.ecmaVersion >= 6) { node.generator = node.expression = false; }
+    if (this.options.ecmaVersion >= 8) { node.async = false; }
+  };
+
+  // Parse object or class method.
+
+  pp$3.parseMethod = function(isGenerator, isAsync, allowDirectSuper) {
+    var node = this.startNode(), oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
+
+    this.initFunction(node);
+    if (this.options.ecmaVersion >= 6)
+      { node.generator = isGenerator; }
+    if (this.options.ecmaVersion >= 8)
+      { node.async = !!isAsync; }
+
+    this.yieldPos = 0;
+    this.awaitPos = 0;
+    this.awaitIdentPos = 0;
+    this.enterScope(functionFlags(isAsync, node.generator) | SCOPE_SUPER | (allowDirectSuper ? SCOPE_DIRECT_SUPER : 0));
+
+    this.expect(types.parenL);
+    node.params = this.parseBindingList(types.parenR, false, this.options.ecmaVersion >= 8);
+    this.checkYieldAwaitInDefaultParams();
+    this.parseFunctionBody(node, false, true);
+
+    this.yieldPos = oldYieldPos;
+    this.awaitPos = oldAwaitPos;
+    this.awaitIdentPos = oldAwaitIdentPos;
+    return this.finishNode(node, "FunctionExpression")
+  };
+
+  // Parse arrow function expression with given parameters.
+
+  pp$3.parseArrowExpression = function(node, params, isAsync) {
+    var oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
+
+    this.enterScope(functionFlags(isAsync, false) | SCOPE_ARROW);
+    this.initFunction(node);
+    if (this.options.ecmaVersion >= 8) { node.async = !!isAsync; }
+
+    this.yieldPos = 0;
+    this.awaitPos = 0;
+    this.awaitIdentPos = 0;
+
+    node.params = this.toAssignableList(params, true);
+    this.parseFunctionBody(node, true, false);
+
+    this.yieldPos = oldYieldPos;
+    this.awaitPos = oldAwaitPos;
+    this.awaitIdentPos = oldAwaitIdentPos;
+    return this.finishNode(node, "ArrowFunctionExpression")
+  };
+
+  // Parse function body and check parameters.
+
+  pp$3.parseFunctionBody = function(node, isArrowFunction, isMethod) {
+    var isExpression = isArrowFunction && this.type !== types.braceL;
+    var oldStrict = this.strict, useStrict = false;
+
+    if (isExpression) {
+      node.body = this.parseMaybeAssign();
+      node.expression = true;
+      this.checkParams(node, false);
+    } else {
+      var nonSimple = this.options.ecmaVersion >= 7 && !this.isSimpleParamList(node.params);
+      if (!oldStrict || nonSimple) {
+        useStrict = this.strictDirective(this.end);
+        // If this is a strict mode function, verify that argument names
+        // are not repeated, and it does not try to bind the words `eval`
+        // or `arguments`.
+        if (useStrict && nonSimple)
+          { this.raiseRecoverable(node.start, "Illegal 'use strict' directive in function with non-simple parameter list"); }
+      }
+      // Start a new scope with regard to labels and the `inFunction`
+      // flag (restore them to their old value afterwards).
+      var oldLabels = this.labels;
+      this.labels = [];
+      if (useStrict) { this.strict = true; }
+
+      // Add the params to varDeclaredNames to ensure that an error is thrown
+      // if a let/const declaration in the function clashes with one of the params.
+      this.checkParams(node, !oldStrict && !useStrict && !isArrowFunction && !isMethod && this.isSimpleParamList(node.params));
+      node.body = this.parseBlock(false);
+      node.expression = false;
+      this.adaptDirectivePrologue(node.body.body);
+      this.labels = oldLabels;
+    }
+    this.exitScope();
+
+    // Ensure the function name isn't a forbidden identifier in strict mode, e.g. 'eval'
+    if (this.strict && node.id) { this.checkLVal(node.id, BIND_OUTSIDE); }
+    this.strict = oldStrict;
+  };
+
+  pp$3.isSimpleParamList = function(params) {
+    for (var i = 0, list = params; i < list.length; i += 1)
+      {
+      var param = list[i];
+
+      if (param.type !== "Identifier") { return false
+    } }
+    return true
+  };
+
+  // Checks function params for various disallowed patterns such as using "eval"
+  // or "arguments" and duplicate parameters.
+
+  pp$3.checkParams = function(node, allowDuplicates) {
+    var nameHash = {};
+    for (var i = 0, list = node.params; i < list.length; i += 1)
+      {
+      var param = list[i];
+
+      this.checkLVal(param, BIND_VAR, allowDuplicates ? null : nameHash);
+    }
+  };
+
+  // Parses a comma-separated list of expressions, and returns them as
+  // an array. `close` is the token type that ends the list, and
+  // `allowEmpty` can be turned on to allow subsequent commas with
+  // nothing in between them to be parsed as `null` (which is needed
+  // for array literals).
+
+  pp$3.parseExprList = function(close, allowTrailingComma, allowEmpty, refDestructuringErrors) {
+    var elts = [], first = true;
+    while (!this.eat(close)) {
+      if (!first) {
+        this.expect(types.comma);
+        if (allowTrailingComma && this.afterTrailingComma(close)) { break }
+      } else { first = false; }
+
+      var elt = (void 0);
+      if (allowEmpty && this.type === types.comma)
+        { elt = null; }
+      else if (this.type === types.ellipsis) {
+        elt = this.parseSpread(refDestructuringErrors);
+        if (refDestructuringErrors && this.type === types.comma && refDestructuringErrors.trailingComma < 0)
+          { refDestructuringErrors.trailingComma = this.start; }
+      } else {
+        elt = this.parseMaybeAssign(false, refDestructuringErrors);
+      }
+      elts.push(elt);
+    }
+    return elts
+  };
+
+  pp$3.checkUnreserved = function(ref) {
+    var start = ref.start;
+    var end = ref.end;
+    var name = ref.name;
+
+    if (this.inGenerator && name === "yield")
+      { this.raiseRecoverable(start, "Cannot use 'yield' as identifier inside a generator"); }
+    if (this.inAsync && name === "await")
+      { this.raiseRecoverable(start, "Cannot use 'await' as identifier inside an async function"); }
+    if (this.keywords.test(name))
+      { this.raise(start, ("Unexpected keyword '" + name + "'")); }
+    if (this.options.ecmaVersion < 6 &&
+      this.input.slice(start, end).indexOf("\\") !== -1) { return }
+    var re = this.strict ? this.reservedWordsStrict : this.reservedWords;
+    if (re.test(name)) {
+      if (!this.inAsync && name === "await")
+        { this.raiseRecoverable(start, "Cannot use keyword 'await' outside an async function"); }
+      this.raiseRecoverable(start, ("The keyword '" + name + "' is reserved"));
+    }
+  };
+
+  // Parse the next token as an identifier. If `liberal` is true (used
+  // when parsing properties), it will also convert keywords into
+  // identifiers.
+
+  pp$3.parseIdent = function(liberal, isBinding) {
+    var node = this.startNode();
+    if (liberal && this.options.allowReserved === "never") { liberal = false; }
+    if (this.type === types.name) {
+      node.name = this.value;
+    } else if (this.type.keyword) {
+      node.name = this.type.keyword;
+
+      // To fix https://github.com/acornjs/acorn/issues/575
+      // `class` and `function` keywords push new context into this.context.
+      // But there is no chance to pop the context if the keyword is consumed as an identifier such as a property name.
+      // If the previous token is a dot, this does not apply because the context-managing code already ignored the keyword
+      if ((node.name === "class" || node.name === "function") &&
+          (this.lastTokEnd !== this.lastTokStart + 1 || this.input.charCodeAt(this.lastTokStart) !== 46)) {
+        this.context.pop();
+      }
+    } else {
+      this.unexpected();
+    }
+    this.next();
+    this.finishNode(node, "Identifier");
+    if (!liberal) {
+      this.checkUnreserved(node);
+      if (node.name === "await" && !this.awaitIdentPos)
+        { this.awaitIdentPos = node.start; }
+    }
+    return node
+  };
+
+  // Parses yield expression inside generator.
+
+  pp$3.parseYield = function(noIn) {
+    if (!this.yieldPos) { this.yieldPos = this.start; }
+
+    var node = this.startNode();
+    this.next();
+    if (this.type === types.semi || this.canInsertSemicolon() || (this.type !== types.star && !this.type.startsExpr)) {
+      node.delegate = false;
+      node.argument = null;
+    } else {
+      node.delegate = this.eat(types.star);
+      node.argument = this.parseMaybeAssign(noIn);
+    }
+    return this.finishNode(node, "YieldExpression")
+  };
+
+  pp$3.parseAwait = function() {
+    if (!this.awaitPos) { this.awaitPos = this.start; }
+
+    var node = this.startNode();
+    this.next();
+    node.argument = this.parseMaybeUnary(null, true);
+    return this.finishNode(node, "AwaitExpression")
+  };
+
+  var pp$4 = Parser.prototype;
+
+  // This function is used to raise exceptions on parse errors. It
+  // takes an offset integer (into the current `input`) to indicate
+  // the location of the error, attaches the position to the end
+  // of the error message, and then raises a `SyntaxError` with that
+  // message.
+
+  pp$4.raise = function(pos, message) {
+    var loc = getLineInfo(this.input, pos);
+    message += " (" + loc.line + ":" + loc.column + ")";
+    var err = new SyntaxError(message);
+    err.pos = pos; err.loc = loc; err.raisedAt = this.pos;
+    throw err
+  };
+
+  pp$4.raiseRecoverable = pp$4.raise;
+
+  pp$4.curPosition = function() {
+    if (this.options.locations) {
+      return new Position(this.curLine, this.pos - this.lineStart)
+    }
+  };
+
+  var pp$5 = Parser.prototype;
+
+  var Scope = function Scope(flags) {
+    this.flags = flags;
+    // A list of var-declared names in the current lexical scope
+    this.var = [];
+    // A list of lexically-declared names in the current lexical scope
+    this.lexical = [];
+    // A list of lexically-declared FunctionDeclaration names in the current lexical scope
+    this.functions = [];
+  };
+
+  // The functions in this module keep track of declared variables in the current scope in order to detect duplicate variable names.
+
+  pp$5.enterScope = function(flags) {
+    this.scopeStack.push(new Scope(flags));
+  };
+
+  pp$5.exitScope = function() {
+    this.scopeStack.pop();
+  };
+
+  // The spec says:
+  // > At the top level of a function, or script, function declarations are
+  // > treated like var declarations rather than like lexical declarations.
+  pp$5.treatFunctionsAsVarInScope = function(scope) {
+    return (scope.flags & SCOPE_FUNCTION) || !this.inModule && (scope.flags & SCOPE_TOP)
+  };
+
+  pp$5.declareName = function(name, bindingType, pos) {
+    var redeclared = false;
+    if (bindingType === BIND_LEXICAL) {
+      var scope = this.currentScope();
+      redeclared = scope.lexical.indexOf(name) > -1 || scope.functions.indexOf(name) > -1 || scope.var.indexOf(name) > -1;
+      scope.lexical.push(name);
+      if (this.inModule && (scope.flags & SCOPE_TOP))
+        { delete this.undefinedExports[name]; }
+    } else if (bindingType === BIND_SIMPLE_CATCH) {
+      var scope$1 = this.currentScope();
+      scope$1.lexical.push(name);
+    } else if (bindingType === BIND_FUNCTION) {
+      var scope$2 = this.currentScope();
+      if (this.treatFunctionsAsVar)
+        { redeclared = scope$2.lexical.indexOf(name) > -1; }
+      else
+        { redeclared = scope$2.lexical.indexOf(name) > -1 || scope$2.var.indexOf(name) > -1; }
+      scope$2.functions.push(name);
+    } else {
+      for (var i = this.scopeStack.length - 1; i >= 0; --i) {
+        var scope$3 = this.scopeStack[i];
+        if (scope$3.lexical.indexOf(name) > -1 && !((scope$3.flags & SCOPE_SIMPLE_CATCH) && scope$3.lexical[0] === name) ||
+            !this.treatFunctionsAsVarInScope(scope$3) && scope$3.functions.indexOf(name) > -1) {
+          redeclared = true;
+          break
+        }
+        scope$3.var.push(name);
+        if (this.inModule && (scope$3.flags & SCOPE_TOP))
+          { delete this.undefinedExports[name]; }
+        if (scope$3.flags & SCOPE_VAR) { break }
+      }
+    }
+    if (redeclared) { this.raiseRecoverable(pos, ("Identifier '" + name + "' has already been declared")); }
+  };
+
+  pp$5.checkLocalExport = function(id) {
+    // scope.functions must be empty as Module code is always strict.
+    if (this.scopeStack[0].lexical.indexOf(id.name) === -1 &&
+        this.scopeStack[0].var.indexOf(id.name) === -1) {
+      this.undefinedExports[id.name] = id;
+    }
+  };
+
+  pp$5.currentScope = function() {
+    return this.scopeStack[this.scopeStack.length - 1]
+  };
+
+  pp$5.currentVarScope = function() {
+    for (var i = this.scopeStack.length - 1;; i--) {
+      var scope = this.scopeStack[i];
+      if (scope.flags & SCOPE_VAR) { return scope }
+    }
+  };
+
+  // Could be useful for `this`, `new.target`, `super()`, `super.property`, and `super[property]`.
+  pp$5.currentThisScope = function() {
+    for (var i = this.scopeStack.length - 1;; i--) {
+      var scope = this.scopeStack[i];
+      if (scope.flags & SCOPE_VAR && !(scope.flags & SCOPE_ARROW)) { return scope }
+    }
+  };
+
+  var Node = function Node(parser, pos, loc) {
+    this.type = "";
+    this.start = pos;
+    this.end = 0;
+    if (parser.options.locations)
+      { this.loc = new SourceLocation(parser, loc); }
+    if (parser.options.directSourceFile)
+      { this.sourceFile = parser.options.directSourceFile; }
+    if (parser.options.ranges)
+      { this.range = [pos, 0]; }
+  };
+
+  // Start an AST node, attaching a start offset.
+
+  var pp$6 = Parser.prototype;
+
+  pp$6.startNode = function() {
+    return new Node(this, this.start, this.startLoc)
+  };
+
+  pp$6.startNodeAt = function(pos, loc) {
+    return new Node(this, pos, loc)
+  };
+
+  // Finish an AST node, adding `type` and `end` properties.
+
+  function finishNodeAt(node, type, pos, loc) {
+    node.type = type;
+    node.end = pos;
+    if (this.options.locations)
+      { node.loc.end = loc; }
+    if (this.options.ranges)
+      { node.range[1] = pos; }
+    return node
+  }
+
+  pp$6.finishNode = function(node, type) {
+    return finishNodeAt.call(this, node, type, this.lastTokEnd, this.lastTokEndLoc)
+  };
+
+  // Finish node at given position
+
+  pp$6.finishNodeAt = function(node, type, pos, loc) {
+    return finishNodeAt.call(this, node, type, pos, loc)
+  };
+
+  // The algorithm used to determine whether a regexp can appear at a
+
+  var TokContext = function TokContext(token, isExpr, preserveSpace, override, generator) {
+    this.token = token;
+    this.isExpr = !!isExpr;
+    this.preserveSpace = !!preserveSpace;
+    this.override = override;
+    this.generator = !!generator;
+  };
+
+  var types$1 = {
+    b_stat: new TokContext("{", false),
+    b_expr: new TokContext("{", true),
+    b_tmpl: new TokContext("${", false),
+    p_stat: new TokContext("(", false),
+    p_expr: new TokContext("(", true),
+    q_tmpl: new TokContext("`", true, true, function (p) { return p.tryReadTemplateToken(); }),
+    f_stat: new TokContext("function", false),
+    f_expr: new TokContext("function", true),
+    f_expr_gen: new TokContext("function", true, false, null, true),
+    f_gen: new TokContext("function", false, false, null, true)
+  };
+
+  var pp$7 = Parser.prototype;
+
+  pp$7.initialContext = function() {
+    return [types$1.b_stat]
+  };
+
+  pp$7.braceIsBlock = function(prevType) {
+    var parent = this.curContext();
+    if (parent === types$1.f_expr || parent === types$1.f_stat)
+      { return true }
+    if (prevType === types.colon && (parent === types$1.b_stat || parent === types$1.b_expr))
+      { return !parent.isExpr }
+
+    // The check for `tt.name && exprAllowed` detects whether we are
+    // after a `yield` or `of` construct. See the `updateContext` for
+    // `tt.name`.
+    if (prevType === types._return || prevType === types.name && this.exprAllowed)
+      { return lineBreak.test(this.input.slice(this.lastTokEnd, this.start)) }
+    if (prevType === types._else || prevType === types.semi || prevType === types.eof || prevType === types.parenR || prevType === types.arrow)
+      { return true }
+    if (prevType === types.braceL)
+      { return parent === types$1.b_stat }
+    if (prevType === types._var || prevType === types._const || prevType === types.name)
+      { return false }
+    return !this.exprAllowed
+  };
+
+  pp$7.inGeneratorContext = function() {
+    for (var i = this.context.length - 1; i >= 1; i--) {
+      var context = this.context[i];
+      if (context.token === "function")
+        { return context.generator }
+    }
+    return false
+  };
+
+  pp$7.updateContext = function(prevType) {
+    var update, type = this.type;
+    if (type.keyword && prevType === types.dot)
+      { this.exprAllowed = false; }
+    else if (update = type.updateContext)
+      { update.call(this, prevType); }
+    else
+      { this.exprAllowed = type.beforeExpr; }
+  };
 
-var empty$1 = [];
+  // Token-specific context update code
 
-pp$3.parseNew = function() {
-  var node = this.startNode();
-  var meta = this.parseIdent(true);
-  if (this.options.ecmaVersion >= 6 && this.eat(types.dot)) {
-    node.meta = meta;
-    var containsEsc = this.containsEsc;
-    node.property = this.parseIdent(true);
-    if (node.property.name !== "target" || containsEsc)
-      { this.raiseRecoverable(node.property.start, "The only valid meta property for new is new.target"); }
-    if (!this.inNonArrowFunction())
-      { this.raiseRecoverable(node.start, "new.target can only be used in functions"); }
-    return this.finishNode(node, "MetaProperty")
-  }
-  var startPos = this.start, startLoc = this.startLoc;
-  node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
-  if (this.eat(types.parenL)) { node.arguments = this.parseExprList(types.parenR, this.options.ecmaVersion >= 8, false); }
-  else { node.arguments = empty$1; }
-  return this.finishNode(node, "NewExpression")
-};
-
-// Parse template expression.
-
-pp$3.parseTemplateElement = function(ref) {
-  var isTagged = ref.isTagged;
-
-  var elem = this.startNode();
-  if (this.type === types.invalidTemplate) {
-    if (!isTagged) {
-      this.raiseRecoverable(this.start, "Bad escape sequence in untagged template literal");
-    }
-    elem.value = {
-      raw: this.value,
-      cooked: null
-    };
-  } else {
-    elem.value = {
-      raw: this.input.slice(this.start, this.end).replace(/\r\n?/g, "\n"),
-      cooked: this.value
+  types.parenR.updateContext = types.braceR.updateContext = function() {
+    if (this.context.length === 1) {
+      this.exprAllowed = true;
+      return
+    }
+    var out = this.context.pop();
+    if (out === types$1.b_stat && this.curContext().token === "function") {
+      out = this.context.pop();
+    }
+    this.exprAllowed = !out.isExpr;
+  };
+
+  types.braceL.updateContext = function(prevType) {
+    this.context.push(this.braceIsBlock(prevType) ? types$1.b_stat : types$1.b_expr);
+    this.exprAllowed = true;
+  };
+
+  types.dollarBraceL.updateContext = function() {
+    this.context.push(types$1.b_tmpl);
+    this.exprAllowed = true;
+  };
+
+  types.parenL.updateContext = function(prevType) {
+    var statementParens = prevType === types._if || prevType === types._for || prevType === types._with || prevType === types._while;
+    this.context.push(statementParens ? types$1.p_stat : types$1.p_expr);
+    this.exprAllowed = true;
+  };
+
+  types.incDec.updateContext = function() {
+    // tokExprAllowed stays unchanged
+  };
+
+  types._function.updateContext = types._class.updateContext = function(prevType) {
+    if (prevType.beforeExpr && prevType !== types.semi && prevType !== types._else &&
+        !(prevType === types._return && lineBreak.test(this.input.slice(this.lastTokEnd, this.start))) &&
+        !((prevType === types.colon || prevType === types.braceL) && this.curContext() === types$1.b_stat))
+      { this.context.push(types$1.f_expr); }
+    else
+      { this.context.push(types$1.f_stat); }
+    this.exprAllowed = false;
+  };
+
+  types.backQuote.updateContext = function() {
+    if (this.curContext() === types$1.q_tmpl)
+      { this.context.pop(); }
+    else
+      { this.context.push(types$1.q_tmpl); }
+    this.exprAllowed = false;
+  };
+
+  types.star.updateContext = function(prevType) {
+    if (prevType === types._function) {
+      var index = this.context.length - 1;
+      if (this.context[index] === types$1.f_expr)
+        { this.context[index] = types$1.f_expr_gen; }
+      else
+        { this.context[index] = types$1.f_gen; }
+    }
+    this.exprAllowed = true;
+  };
+
+  types.name.updateContext = function(prevType) {
+    var allowed = false;
+    if (this.options.ecmaVersion >= 6 && prevType !== types.dot) {
+      if (this.value === "of" && !this.exprAllowed ||
+          this.value === "yield" && this.inGeneratorContext())
+        { allowed = true; }
+    }
+    this.exprAllowed = allowed;
+  };
+
+  // This file contains Unicode properties extracted from the ECMAScript
+  // specification. The lists are extracted like so:
+  // $$('#table-binary-unicode-properties > figure > table > tbody > tr > td:nth-child(1) code').map(el => el.innerText)
+
+  // #table-binary-unicode-properties
+  var ecma9BinaryProperties = "ASCII ASCII_Hex_Digit AHex Alphabetic Alpha Any Assigned Bidi_Control Bidi_C Bidi_Mirrored Bidi_M Case_Ignorable CI Cased Changes_When_Casefolded CWCF Changes_When_Casemapped CWCM Changes_When_Lowercased CWL Changes_When_NFKC_Casefolded CWKCF Changes_When_Titlecased CWT Changes_When_Uppercased CWU Dash Default_Ignorable_Code_Point DI Deprecated Dep Diacritic Dia Emoji Emoji_Component Emoji_Modifier Emoji_Modifier_Base Emoji_Presentation Extender Ext Grapheme_Base Gr_Base Grapheme_Extend Gr_Ext Hex_Digit Hex IDS_Binary_Operator IDSB IDS_Trinary_Operator IDST ID_Continue IDC ID_Start IDS Ideographic Ideo Join_Control Join_C Logical_Order_Exception LOE Lowercase Lower Math Noncharacter_Code_Point NChar Pattern_Syntax Pat_Syn Pattern_White_Space Pat_WS Quotation_Mark QMark Radical Regional_Indicator RI Sentence_Terminal STerm Soft_Dotted SD Terminal_Punctuation Term Unified_Ideograph UIdeo Uppercase Upper Variation_Selector VS White_Space space XID_Continue XIDC XID_Start XIDS";
+  var unicodeBinaryProperties = {
+    9: ecma9BinaryProperties,
+    10: ecma9BinaryProperties + " Extended_Pictographic"
+  };
+
+  // #table-unicode-general-category-values
+  var unicodeGeneralCategoryValues = "Cased_Letter LC Close_Punctuation Pe Connector_Punctuation Pc Control Cc cntrl Currency_Symbol Sc Dash_Punctuation Pd Decimal_Number Nd digit Enclosing_Mark Me Final_Punctuation Pf Format Cf Initial_Punctuation Pi Letter L Letter_Number Nl Line_Separator Zl Lowercase_Letter Ll Mark M Combining_Mark Math_Symbol Sm Modifier_Letter Lm Modifier_Symbol Sk Nonspacing_Mark Mn Number N Open_Punctuation Ps Other C Other_Letter Lo Other_Number No Other_Punctuation Po Other_Symbol So Paragraph_Separator Zp Private_Use Co Punctuation P punct Separator Z Space_Separator Zs Spacing_Mark Mc Surrogate Cs Symbol S Titlecase_Letter Lt Unassigned Cn Uppercase_Letter Lu";
+
+  // #table-unicode-script-values
+  var ecma9ScriptValues = "Adlam Adlm Ahom Ahom Anatolian_Hieroglyphs Hluw Arabic Arab Armenian Armn Avestan Avst Balinese Bali Bamum Bamu Bassa_Vah Bass Batak Batk Bengali Beng Bhaiksuki Bhks Bopomofo Bopo Brahmi Brah Braille Brai Buginese Bugi Buhid Buhd Canadian_Aboriginal Cans Carian Cari Caucasian_Albanian Aghb Chakma Cakm Cham Cham Cherokee Cher Common Zyyy Coptic Copt Qaac Cuneiform Xsux Cypriot Cprt Cyrillic Cyrl Deseret Dsrt Devanagari Deva Duployan Dupl Egyptian_Hieroglyphs Egyp Elbasan Elba Ethiopic Ethi Georgian Geor Glagolitic Glag Gothic Goth Grantha Gran Greek Grek Gujarati Gujr Gurmukhi Guru Han Hani Hangul Hang Hanunoo Hano Hatran Hatr Hebrew Hebr Hiragana Hira Imperial_Aramaic Armi Inherited Zinh Qaai Inscriptional_Pahlavi Phli Inscriptional_Parthian Prti Javanese Java Kaithi Kthi Kannada Knda Katakana Kana Kayah_Li Kali Kharoshthi Khar Khmer Khmr Khojki Khoj Khudawadi Sind Lao Laoo Latin Latn Lepcha Lepc Limbu Limb Linear_A Lina Linear_B Linb Lisu Lisu Lycian Lyci Lydian Lydi Mahajani Mahj Malayalam Mlym Mandaic Mand Manichaean Mani Marchen Marc Masaram_Gondi Gonm Meetei_Mayek Mtei Mende_Kikakui Mend Meroitic_Cursive Merc Meroitic_Hieroglyphs Mero Miao Plrd Modi Modi Mongolian Mong Mro Mroo Multani Mult Myanmar Mymr Nabataean Nbat New_Tai_Lue Talu Newa Newa Nko Nkoo Nushu Nshu Ogham Ogam Ol_Chiki Olck Old_Hungarian Hung Old_Italic Ital Old_North_Arabian Narb Old_Permic Perm Old_Persian Xpeo Old_South_Arabian Sarb Old_Turkic Orkh Oriya Orya Osage Osge Osmanya Osma Pahawh_Hmong Hmng Palmyrene Palm Pau_Cin_Hau Pauc Phags_Pa Phag Phoenician Phnx Psalter_Pahlavi Phlp Rejang Rjng Runic Runr Samaritan Samr Saurashtra Saur Sharada Shrd Shavian Shaw Siddham Sidd SignWriting Sgnw Sinhala Sinh Sora_Sompeng Sora Soyombo Soyo Sundanese Sund Syloti_Nagri Sylo Syriac Syrc Tagalog Tglg Tagbanwa Tagb Tai_Le Tale Tai_Tham Lana Tai_Viet Tavt Takri Takr Tamil Taml Tangut Tang Telugu Telu Thaana Thaa Thai Thai Tibetan Tibt Tifinagh Tfng Tirhuta Tirh Ugaritic Ugar Vai Vaii Warang_Citi Wara Yi Yiii Zanabazar_Square Zanb";
+  var unicodeScriptValues = {
+    9: ecma9ScriptValues,
+    10: ecma9ScriptValues + " Dogra Dogr Elymaic Elym Gunjala_Gondi Gong Hanifi_Rohingya Rohg Makasar Maka Medefaidrin Medf Nandinagari Nand Nyiakeng_Puachue_Hmong Hmnp Old_Sogdian Sogo Sogdian Sogd Wancho Wcho"
+  };
+
+  var data = {};
+  function buildUnicodeData(ecmaVersion) {
+    var d = data[ecmaVersion] = {
+      binary: wordsRegexp(unicodeBinaryProperties[ecmaVersion] + " " + unicodeGeneralCategoryValues),
+      nonBinary: {
+        General_Category: wordsRegexp(unicodeGeneralCategoryValues),
+        Script: wordsRegexp(unicodeScriptValues[ecmaVersion])
+      }
     };
-  }
-  this.next();
-  elem.tail = this.type === types.backQuote;
-  return this.finishNode(elem, "TemplateElement")
-};
-
-pp$3.parseTemplate = function(ref) {
-  var this$1 = this;
-  if ( ref === void 0 ) ref = {};
-  var isTagged = ref.isTagged; if ( isTagged === void 0 ) isTagged = false;
-
-  var node = this.startNode();
-  this.next();
-  node.expressions = [];
-  var curElt = this.parseTemplateElement({isTagged: isTagged});
-  node.quasis = [curElt];
-  while (!curElt.tail) {
-    if (this$1.type === types.eof) { this$1.raise(this$1.pos, "Unterminated template literal"); }
-    this$1.expect(types.dollarBraceL);
-    node.expressions.push(this$1.parseExpression());
-    this$1.expect(types.braceR);
-    node.quasis.push(curElt = this$1.parseTemplateElement({isTagged: isTagged}));
-  }
-  this.next();
-  return this.finishNode(node, "TemplateLiteral")
-};
-
-pp$3.isAsyncProp = function(prop) {
-  return !prop.computed && prop.key.type === "Identifier" && prop.key.name === "async" &&
-    (this.type === types.name || this.type === types.num || this.type === types.string || this.type === types.bracketL || this.type.keyword || (this.options.ecmaVersion >= 9 && this.type === types.star)) &&
-    !lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
-};
-
-// Parse an object literal or binding pattern.
-
-pp$3.parseObj = function(isPattern, refDestructuringErrors) {
-  var this$1 = this;
-
-  var node = this.startNode(), first = true, propHash = {};
-  node.properties = [];
-  this.next();
-  while (!this.eat(types.braceR)) {
-    if (!first) {
-      this$1.expect(types.comma);
-      if (this$1.afterTrailingComma(types.braceR)) { break }
-    } else { first = false; }
-
-    var prop = this$1.parseProperty(isPattern, refDestructuringErrors);
-    if (!isPattern) { this$1.checkPropClash(prop, propHash, refDestructuringErrors); }
-    node.properties.push(prop);
-  }
-  return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression")
-};
-
-pp$3.parseProperty = function(isPattern, refDestructuringErrors) {
-  var prop = this.startNode(), isGenerator, isAsync, startPos, startLoc;
-  if (this.options.ecmaVersion >= 9 && this.eat(types.ellipsis)) {
-    if (isPattern) {
-      prop.argument = this.parseIdent(false);
-      if (this.type === types.comma) {
-        this.raise(this.start, "Comma is not permitted after the rest element");
+    d.nonBinary.Script_Extensions = d.nonBinary.Script;
+
+    d.nonBinary.gc = d.nonBinary.General_Category;
+    d.nonBinary.sc = d.nonBinary.Script;
+    d.nonBinary.scx = d.nonBinary.Script_Extensions;
+  }
+  buildUnicodeData(9);
+  buildUnicodeData(10);
+
+  var pp$8 = Parser.prototype;
+
+  var RegExpValidationState = function RegExpValidationState(parser) {
+    this.parser = parser;
+    this.validFlags = "gim" + (parser.options.ecmaVersion >= 6 ? "uy" : "") + (parser.options.ecmaVersion >= 9 ? "s" : "");
+    this.unicodeProperties = data[parser.options.ecmaVersion >= 10 ? 10 : parser.options.ecmaVersion];
+    this.source = "";
+    this.flags = "";
+    this.start = 0;
+    this.switchU = false;
+    this.switchN = false;
+    this.pos = 0;
+    this.lastIntValue = 0;
+    this.lastStringValue = "";
+    this.lastAssertionIsQuantifiable = false;
+    this.numCapturingParens = 0;
+    this.maxBackReference = 0;
+    this.groupNames = [];
+    this.backReferenceNames = [];
+  };
+
+  RegExpValidationState.prototype.reset = function reset (start, pattern, flags) {
+    var unicode = flags.indexOf("u") !== -1;
+    this.start = start | 0;
+    this.source = pattern + "";
+    this.flags = flags;
+    this.switchU = unicode && this.parser.options.ecmaVersion >= 6;
+    this.switchN = unicode && this.parser.options.ecmaVersion >= 9;
+  };
+
+  RegExpValidationState.prototype.raise = function raise (message) {
+    this.parser.raiseRecoverable(this.start, ("Invalid regular expression: /" + (this.source) + "/: " + message));
+  };
+
+  // If u flag is given, this returns the code point at the index (it combines a surrogate pair).
+  // Otherwise, this returns the code unit of the index (can be a part of a surrogate pair).
+  RegExpValidationState.prototype.at = function at (i) {
+    var s = this.source;
+    var l = s.length;
+    if (i >= l) {
+      return -1
+    }
+    var c = s.charCodeAt(i);
+    if (!this.switchU || c <= 0xD7FF || c >= 0xE000 || i + 1 >= l) {
+      return c
+    }
+    return (c << 10) + s.charCodeAt(i + 1) - 0x35FDC00
+  };
+
+  RegExpValidationState.prototype.nextIndex = function nextIndex (i) {
+    var s = this.source;
+    var l = s.length;
+    if (i >= l) {
+      return l
+    }
+    var c = s.charCodeAt(i);
+    if (!this.switchU || c <= 0xD7FF || c >= 0xE000 || i + 1 >= l) {
+      return i + 1
+    }
+    return i + 2
+  };
+
+  RegExpValidationState.prototype.current = function current () {
+    return this.at(this.pos)
+  };
+
+  RegExpValidationState.prototype.lookahead = function lookahead () {
+    return this.at(this.nextIndex(this.pos))
+  };
+
+  RegExpValidationState.prototype.advance = function advance () {
+    this.pos = this.nextIndex(this.pos);
+  };
+
+  RegExpValidationState.prototype.eat = function eat (ch) {
+    if (this.current() === ch) {
+      this.advance();
+      return true
+    }
+    return false
+  };
+
+  function codePointToString(ch) {
+    if (ch <= 0xFFFF) { return String.fromCharCode(ch) }
+    ch -= 0x10000;
+    return String.fromCharCode((ch >> 10) + 0xD800, (ch & 0x03FF) + 0xDC00)
+  }
+
+  /**
+   * Validate the flags part of a given RegExpLiteral.
+   *
+   * @param {RegExpValidationState} state The state to validate RegExp.
+   * @returns {void}
+   */
+  pp$8.validateRegExpFlags = function(state) {
+    var validFlags = state.validFlags;
+    var flags = state.flags;
+
+    for (var i = 0; i < flags.length; i++) {
+      var flag = flags.charAt(i);
+      if (validFlags.indexOf(flag) === -1) {
+        this.raise(state.start, "Invalid regular expression flag");
       }
-      return this.finishNode(prop, "RestElement")
+      if (flags.indexOf(flag, i + 1) > -1) {
+        this.raise(state.start, "Duplicate regular expression flag");
+      }
+    }
+  };
+
+  /**
+   * Validate the pattern part of a given RegExpLiteral.
+   *
+   * @param {RegExpValidationState} state The state to validate RegExp.
+   * @returns {void}
+   */
+  pp$8.validateRegExpPattern = function(state) {
+    this.regexp_pattern(state);
+
+    // The goal symbol for the parse is |Pattern[~U, ~N]|. If the result of
+    // parsing contains a |GroupName|, reparse with the goal symbol
+    // |Pattern[~U, +N]| and use this result instead. Throw a *SyntaxError*
+    // exception if _P_ did not conform to the grammar, if any elements of _P_
+    // were not matched by the parse, or if any Early Error conditions exist.
+    if (!state.switchN && this.options.ecmaVersion >= 9 && state.groupNames.length > 0) {
+      state.switchN = true;
+      this.regexp_pattern(state);
     }
-    // To disallow parenthesized identifier via `this.toAssignable()`.
-    if (this.type === types.parenL && refDestructuringErrors) {
-      if (refDestructuringErrors.parenthesizedAssign < 0) {
-        refDestructuringErrors.parenthesizedAssign = this.start;
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-Pattern
+  pp$8.regexp_pattern = function(state) {
+    state.pos = 0;
+    state.lastIntValue = 0;
+    state.lastStringValue = "";
+    state.lastAssertionIsQuantifiable = false;
+    state.numCapturingParens = 0;
+    state.maxBackReference = 0;
+    state.groupNames.length = 0;
+    state.backReferenceNames.length = 0;
+
+    this.regexp_disjunction(state);
+
+    if (state.pos !== state.source.length) {
+      // Make the same messages as V8.
+      if (state.eat(0x29 /* ) */)) {
+        state.raise("Unmatched ')'");
       }
-      if (refDestructuringErrors.parenthesizedBind < 0) {
-        refDestructuringErrors.parenthesizedBind = this.start;
+      if (state.eat(0x5D /* [ */) || state.eat(0x7D /* } */)) {
+        state.raise("Lone quantifier brackets");
       }
     }
-    // Parse argument.
-    prop.argument = this.parseMaybeAssign(false, refDestructuringErrors);
-    // To disallow trailing comma via `this.toAssignable()`.
-    if (this.type === types.comma && refDestructuringErrors && refDestructuringErrors.trailingComma < 0) {
-      refDestructuringErrors.trailingComma = this.start;
+    if (state.maxBackReference > state.numCapturingParens) {
+      state.raise("Invalid escape");
     }
-    // Finish
-    return this.finishNode(prop, "SpreadElement")
-  }
-  if (this.options.ecmaVersion >= 6) {
-    prop.method = false;
-    prop.shorthand = false;
-    if (isPattern || refDestructuringErrors) {
-      startPos = this.start;
-      startLoc = this.startLoc;
-    }
-    if (!isPattern)
-      { isGenerator = this.eat(types.star); }
-  }
-  var containsEsc = this.containsEsc;
-  this.parsePropertyName(prop);
-  if (!isPattern && !containsEsc && this.options.ecmaVersion >= 8 && !isGenerator && this.isAsyncProp(prop)) {
-    isAsync = true;
-    isGenerator = this.options.ecmaVersion >= 9 && this.eat(types.star);
-    this.parsePropertyName(prop, refDestructuringErrors);
-  } else {
-    isAsync = false;
-  }
-  this.parsePropertyValue(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc);
-  return this.finishNode(prop, "Property")
-};
-
-pp$3.parsePropertyValue = function(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc) {
-  if ((isGenerator || isAsync) && this.type === types.colon)
-    { this.unexpected(); }
-
-  if (this.eat(types.colon)) {
-    prop.value = isPattern ? this.parseMaybeDefault(this.start, this.startLoc) : this.parseMaybeAssign(false, refDestructuringErrors);
-    prop.kind = "init";
-  } else if (this.options.ecmaVersion >= 6 && this.type === types.parenL) {
-    if (isPattern) { this.unexpected(); }
-    prop.kind = "init";
-    prop.method = true;
-    prop.value = this.parseMethod(isGenerator, isAsync);
-  } else if (!isPattern && !containsEsc &&
-             this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" &&
-             (prop.key.name === "get" || prop.key.name === "set") &&
-             (this.type !== types.comma && this.type !== types.braceR)) {
-    if (isGenerator || isAsync) { this.unexpected(); }
-    prop.kind = prop.key.name;
-    this.parsePropertyName(prop);
-    prop.value = this.parseMethod(false);
-    var paramCount = prop.kind === "get" ? 0 : 1;
-    if (prop.value.params.length !== paramCount) {
-      var start = prop.value.start;
-      if (prop.kind === "get")
-        { this.raiseRecoverable(start, "getter should have no params"); }
-      else
-        { this.raiseRecoverable(start, "setter should have exactly one param"); }
-    } else {
-      if (prop.kind === "set" && prop.value.params[0].type === "RestElement")
-        { this.raiseRecoverable(prop.value.params[0].start, "Setter cannot use rest params"); }
-    }
-  } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
-    if (isGenerator || isAsync) { this.unexpected(); }
-    this.checkUnreserved(prop.key);
-    if (prop.key.name === "await" && !this.awaitIdentPos)
-      { this.awaitIdentPos = startPos; }
-    prop.kind = "init";
-    if (isPattern) {
-      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
-    } else if (this.type === types.eq && refDestructuringErrors) {
-      if (refDestructuringErrors.shorthandAssign < 0)
-        { refDestructuringErrors.shorthandAssign = this.start; }
-      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
-    } else {
-      prop.value = prop.key;
-    }
-    prop.shorthand = true;
-  } else { this.unexpected(); }
-};
-
-pp$3.parsePropertyName = function(prop) {
-  if (this.options.ecmaVersion >= 6) {
-    if (this.eat(types.bracketL)) {
-      prop.computed = true;
-      prop.key = this.parseMaybeAssign();
-      this.expect(types.bracketR);
-      return prop.key
-    } else {
-      prop.computed = false;
+    for (var i = 0, list = state.backReferenceNames; i < list.length; i += 1) {
+      var name = list[i];
+
+      if (state.groupNames.indexOf(name) === -1) {
+        state.raise("Invalid named capture referenced");
+      }
+    }
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-Disjunction
+  pp$8.regexp_disjunction = function(state) {
+    this.regexp_alternative(state);
+    while (state.eat(0x7C /* | */)) {
+      this.regexp_alternative(state);
     }
-  }
-  return prop.key = this.type === types.num || this.type === types.string ? this.parseExprAtom() : this.parseIdent(true)
-};
-
-// Initialize empty function node.
-
-pp$3.initFunction = function(node) {
-  node.id = null;
-  if (this.options.ecmaVersion >= 6) { node.generator = node.expression = false; }
-  if (this.options.ecmaVersion >= 8) { node.async = false; }
-};
-
-// Parse object or class method.
-
-pp$3.parseMethod = function(isGenerator, isAsync, allowDirectSuper) {
-  var node = this.startNode(), oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
-
-  this.initFunction(node);
-  if (this.options.ecmaVersion >= 6)
-    { node.generator = isGenerator; }
-  if (this.options.ecmaVersion >= 8)
-    { node.async = !!isAsync; }
-
-  this.yieldPos = 0;
-  this.awaitPos = 0;
-  this.awaitIdentPos = 0;
-  this.enterScope(functionFlags(isAsync, node.generator) | SCOPE_SUPER | (allowDirectSuper ? SCOPE_DIRECT_SUPER : 0));
-
-  this.expect(types.parenL);
-  node.params = this.parseBindingList(types.parenR, false, this.options.ecmaVersion >= 8);
-  this.checkYieldAwaitInDefaultParams();
-  this.parseFunctionBody(node, false, true);
-
-  this.yieldPos = oldYieldPos;
-  this.awaitPos = oldAwaitPos;
-  this.awaitIdentPos = oldAwaitIdentPos;
-  return this.finishNode(node, "FunctionExpression")
-};
-
-// Parse arrow function expression with given parameters.
-
-pp$3.parseArrowExpression = function(node, params, isAsync) {
-  var oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
-
-  this.enterScope(functionFlags(isAsync, false) | SCOPE_ARROW);
-  this.initFunction(node);
-  if (this.options.ecmaVersion >= 8) { node.async = !!isAsync; }
-
-  this.yieldPos = 0;
-  this.awaitPos = 0;
-  this.awaitIdentPos = 0;
-
-  node.params = this.toAssignableList(params, true);
-  this.parseFunctionBody(node, true, false);
-
-  this.yieldPos = oldYieldPos;
-  this.awaitPos = oldAwaitPos;
-  this.awaitIdentPos = oldAwaitIdentPos;
-  return this.finishNode(node, "ArrowFunctionExpression")
-};
-
-// Parse function body and check parameters.
-
-pp$3.parseFunctionBody = function(node, isArrowFunction, isMethod) {
-  var isExpression = isArrowFunction && this.type !== types.braceL;
-  var oldStrict = this.strict, useStrict = false;
-
-  if (isExpression) {
-    node.body = this.parseMaybeAssign();
-    node.expression = true;
-    this.checkParams(node, false);
-  } else {
-    var nonSimple = this.options.ecmaVersion >= 7 && !this.isSimpleParamList(node.params);
-    if (!oldStrict || nonSimple) {
-      useStrict = this.strictDirective(this.end);
-      // If this is a strict mode function, verify that argument names
-      // are not repeated, and it does not try to bind the words `eval`
-      // or `arguments`.
-      if (useStrict && nonSimple)
-        { this.raiseRecoverable(node.start, "Illegal 'use strict' directive in function with non-simple parameter list"); }
-    }
-    // Start a new scope with regard to labels and the `inFunction`
-    // flag (restore them to their old value afterwards).
-    var oldLabels = this.labels;
-    this.labels = [];
-    if (useStrict) { this.strict = true; }
-
-    // Add the params to varDeclaredNames to ensure that an error is thrown
-    // if a let/const declaration in the function clashes with one of the params.
-    this.checkParams(node, !oldStrict && !useStrict && !isArrowFunction && !isMethod && this.isSimpleParamList(node.params));
-    node.body = this.parseBlock(false);
-    node.expression = false;
-    this.adaptDirectivePrologue(node.body.body);
-    this.labels = oldLabels;
-  }
-  this.exitScope();
 
-  // Ensure the function name isn't a forbidden identifier in strict mode, e.g. 'eval'
-  if (this.strict && node.id) { this.checkLVal(node.id, BIND_OUTSIDE); }
-  this.strict = oldStrict;
-};
+    // Make the same message as V8.
+    if (this.regexp_eatQuantifier(state, true)) {
+      state.raise("Nothing to repeat");
+    }
+    if (state.eat(0x7B /* { */)) {
+      state.raise("Lone quantifier brackets");
+    }
+  };
 
-pp$3.isSimpleParamList = function(params) {
-  for (var i = 0, list = params; i < list.length; i += 1)
-    {
-    var param = list[i];
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-Alternative
+  pp$8.regexp_alternative = function(state) {
+    while (state.pos < state.source.length && this.regexp_eatTerm(state))
+      { }
+  };
 
-    if (param.type !== "Identifier") { return false
-  } }
-  return true
-};
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Term
+  pp$8.regexp_eatTerm = function(state) {
+    if (this.regexp_eatAssertion(state)) {
+      // Handle `QuantifiableAssertion Quantifier` alternative.
+      // `state.lastAssertionIsQuantifiable` is true if the last eaten Assertion
+      // is a QuantifiableAssertion.
+      if (state.lastAssertionIsQuantifiable && this.regexp_eatQuantifier(state)) {
+        // Make the same message as V8.
+        if (state.switchU) {
+          state.raise("Invalid quantifier");
+        }
+      }
+      return true
+    }
 
-// Checks function params for various disallowed patterns such as using "eval"
-// or "arguments" and duplicate parameters.
+    if (state.switchU ? this.regexp_eatAtom(state) : this.regexp_eatExtendedAtom(state)) {
+      this.regexp_eatQuantifier(state);
+      return true
+    }
 
-pp$3.checkParams = function(node, allowDuplicates) {
-  var this$1 = this;
+    return false
+  };
 
-  var nameHash = {};
-  for (var i = 0, list = node.params; i < list.length; i += 1)
-    {
-    var param = list[i];
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Assertion
+  pp$8.regexp_eatAssertion = function(state) {
+    var start = state.pos;
+    state.lastAssertionIsQuantifiable = false;
 
-    this$1.checkLVal(param, BIND_VAR, allowDuplicates ? null : nameHash);
-  }
-};
-
-// Parses a comma-separated list of expressions, and returns them as
-// an array. `close` is the token type that ends the list, and
-// `allowEmpty` can be turned on to allow subsequent commas with
-// nothing in between them to be parsed as `null` (which is needed
-// for array literals).
-
-pp$3.parseExprList = function(close, allowTrailingComma, allowEmpty, refDestructuringErrors) {
-  var this$1 = this;
-
-  var elts = [], first = true;
-  while (!this.eat(close)) {
-    if (!first) {
-      this$1.expect(types.comma);
-      if (allowTrailingComma && this$1.afterTrailingComma(close)) { break }
-    } else { first = false; }
-
-    var elt = (void 0);
-    if (allowEmpty && this$1.type === types.comma)
-      { elt = null; }
-    else if (this$1.type === types.ellipsis) {
-      elt = this$1.parseSpread(refDestructuringErrors);
-      if (refDestructuringErrors && this$1.type === types.comma && refDestructuringErrors.trailingComma < 0)
-        { refDestructuringErrors.trailingComma = this$1.start; }
-    } else {
-      elt = this$1.parseMaybeAssign(false, refDestructuringErrors);
+    // ^, $
+    if (state.eat(0x5E /* ^ */) || state.eat(0x24 /* $ */)) {
+      return true
     }
-    elts.push(elt);
-  }
-  return elts
-};
-
-pp$3.checkUnreserved = function(ref) {
-  var start = ref.start;
-  var end = ref.end;
-  var name = ref.name;
-
-  if (this.inGenerator && name === "yield")
-    { this.raiseRecoverable(start, "Cannot use 'yield' as identifier inside a generator"); }
-  if (this.inAsync && name === "await")
-    { this.raiseRecoverable(start, "Cannot use 'await' as identifier inside an async function"); }
-  if (this.keywords.test(name))
-    { this.raise(start, ("Unexpected keyword '" + name + "'")); }
-  if (this.options.ecmaVersion < 6 &&
-    this.input.slice(start, end).indexOf("\\") !== -1) { return }
-  var re = this.strict ? this.reservedWordsStrict : this.reservedWords;
-  if (re.test(name)) {
-    if (!this.inAsync && name === "await")
-      { this.raiseRecoverable(start, "Cannot use keyword 'await' outside an async function"); }
-    this.raiseRecoverable(start, ("The keyword '" + name + "' is reserved"));
-  }
-};
-
-// Parse the next token as an identifier. If `liberal` is true (used
-// when parsing properties), it will also convert keywords into
-// identifiers.
-
-pp$3.parseIdent = function(liberal, isBinding) {
-  var node = this.startNode();
-  if (liberal && this.options.allowReserved === "never") { liberal = false; }
-  if (this.type === types.name) {
-    node.name = this.value;
-  } else if (this.type.keyword) {
-    node.name = this.type.keyword;
-
-    // To fix https://github.com/acornjs/acorn/issues/575
-    // `class` and `function` keywords push new context into this.context.
-    // But there is no chance to pop the context if the keyword is consumed as an identifier such as a property name.
-    // If the previous token is a dot, this does not apply because the context-managing code already ignored the keyword
-    if ((node.name === "class" || node.name === "function") &&
-        (this.lastTokEnd !== this.lastTokStart + 1 || this.input.charCodeAt(this.lastTokStart) !== 46)) {
-      this.context.pop();
-    }
-  } else {
-    this.unexpected();
-  }
-  this.next();
-  this.finishNode(node, "Identifier");
-  if (!liberal) {
-    this.checkUnreserved(node);
-    if (node.name === "await" && !this.awaitIdentPos)
-      { this.awaitIdentPos = node.start; }
-  }
-  return node
-};
-
-// Parses yield expression inside generator.
-
-pp$3.parseYield = function(noIn) {
-  if (!this.yieldPos) { this.yieldPos = this.start; }
-
-  var node = this.startNode();
-  this.next();
-  if (this.type === types.semi || this.canInsertSemicolon() || (this.type !== types.star && !this.type.startsExpr)) {
-    node.delegate = false;
-    node.argument = null;
-  } else {
-    node.delegate = this.eat(types.star);
-    node.argument = this.parseMaybeAssign(noIn);
-  }
-  return this.finishNode(node, "YieldExpression")
-};
-
-pp$3.parseAwait = function() {
-  if (!this.awaitPos) { this.awaitPos = this.start; }
-
-  var node = this.startNode();
-  this.next();
-  node.argument = this.parseMaybeUnary(null, true);
-  return this.finishNode(node, "AwaitExpression")
-};
-
-var pp$4 = Parser.prototype;
-
-// This function is used to raise exceptions on parse errors. It
-// takes an offset integer (into the current `input`) to indicate
-// the location of the error, attaches the position to the end
-// of the error message, and then raises a `SyntaxError` with that
-// message.
-
-pp$4.raise = function(pos, message) {
-  var loc = getLineInfo(this.input, pos);
-  message += " (" + loc.line + ":" + loc.column + ")";
-  var err = new SyntaxError(message);
-  err.pos = pos; err.loc = loc; err.raisedAt = this.pos;
-  throw err
-};
-
-pp$4.raiseRecoverable = pp$4.raise;
-
-pp$4.curPosition = function() {
-  if (this.options.locations) {
-    return new Position(this.curLine, this.pos - this.lineStart)
-  }
-};
-
-var pp$5 = Parser.prototype;
-
-var Scope = function Scope(flags) {
-  this.flags = flags;
-  // A list of var-declared names in the current lexical scope
-  this.var = [];
-  // A list of lexically-declared names in the current lexical scope
-  this.lexical = [];
-  // A list of lexically-declared FunctionDeclaration names in the current lexical scope
-  this.functions = [];
-};
-
-// The functions in this module keep track of declared variables in the current scope in order to detect duplicate variable names.
-
-pp$5.enterScope = function(flags) {
-  this.scopeStack.push(new Scope(flags));
-};
-
-pp$5.exitScope = function() {
-  this.scopeStack.pop();
-};
-
-// The spec says:
-// > At the top level of a function, or script, function declarations are
-// > treated like var declarations rather than like lexical declarations.
-pp$5.treatFunctionsAsVarInScope = function(scope) {
-  return (scope.flags & SCOPE_FUNCTION) || !this.inModule && (scope.flags & SCOPE_TOP)
-};
-
-pp$5.declareName = function(name, bindingType, pos) {
-  var this$1 = this;
-
-  var redeclared = false;
-  if (bindingType === BIND_LEXICAL) {
-    var scope = this.currentScope();
-    redeclared = scope.lexical.indexOf(name) > -1 || scope.functions.indexOf(name) > -1 || scope.var.indexOf(name) > -1;
-    scope.lexical.push(name);
-    if (this.inModule && (scope.flags & SCOPE_TOP))
-      { delete this.undefinedExports[name]; }
-  } else if (bindingType === BIND_SIMPLE_CATCH) {
-    var scope$1 = this.currentScope();
-    scope$1.lexical.push(name);
-  } else if (bindingType === BIND_FUNCTION) {
-    var scope$2 = this.currentScope();
-    if (this.treatFunctionsAsVar)
-      { redeclared = scope$2.lexical.indexOf(name) > -1; }
-    else
-      { redeclared = scope$2.lexical.indexOf(name) > -1 || scope$2.var.indexOf(name) > -1; }
-    scope$2.functions.push(name);
-  } else {
-    for (var i = this.scopeStack.length - 1; i >= 0; --i) {
-      var scope$3 = this$1.scopeStack[i];
-      if (scope$3.lexical.indexOf(name) > -1 && !((scope$3.flags & SCOPE_SIMPLE_CATCH) && scope$3.lexical[0] === name) ||
-          !this$1.treatFunctionsAsVarInScope(scope$3) && scope$3.functions.indexOf(name) > -1) {
-        redeclared = true;
-        break
+
+    // \b \B
+    if (state.eat(0x5C /* \ */)) {
+      if (state.eat(0x42 /* B */) || state.eat(0x62 /* b */)) {
+        return true
       }
-      scope$3.var.push(name);
-      if (this$1.inModule && (scope$3.flags & SCOPE_TOP))
-        { delete this$1.undefinedExports[name]; }
-      if (scope$3.flags & SCOPE_VAR) { break }
+      state.pos = start;
     }
-  }
-  if (redeclared) { this.raiseRecoverable(pos, ("Identifier '" + name + "' has already been declared")); }
-};
-
-pp$5.checkLocalExport = function(id) {
-  // scope.functions must be empty as Module code is always strict.
-  if (this.scopeStack[0].lexical.indexOf(id.name) === -1 &&
-      this.scopeStack[0].var.indexOf(id.name) === -1) {
-    this.undefinedExports[id.name] = id;
-  }
-};
 
-pp$5.currentScope = function() {
-  return this.scopeStack[this.scopeStack.length - 1]
-};
+    // Lookahead / Lookbehind
+    if (state.eat(0x28 /* ( */) && state.eat(0x3F /* ? */)) {
+      var lookbehind = false;
+      if (this.options.ecmaVersion >= 9) {
+        lookbehind = state.eat(0x3C /* < */);
+      }
+      if (state.eat(0x3D /* = */) || state.eat(0x21 /* ! */)) {
+        this.regexp_disjunction(state);
+        if (!state.eat(0x29 /* ) */)) {
+          state.raise("Unterminated group");
+        }
+        state.lastAssertionIsQuantifiable = !lookbehind;
+        return true
+      }
+    }
 
-pp$5.currentVarScope = function() {
-  var this$1 = this;
+    state.pos = start;
+    return false
+  };
 
-  for (var i = this.scopeStack.length - 1;; i--) {
-    var scope = this$1.scopeStack[i];
-    if (scope.flags & SCOPE_VAR) { return scope }
-  }
-};
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-Quantifier
+  pp$8.regexp_eatQuantifier = function(state, noError) {
+    if ( noError === void 0 ) noError = false;
 
-// Could be useful for `this`, `new.target`, `super()`, `super.property`, and `super[property]`.
-pp$5.currentThisScope = function() {
-  var this$1 = this;
+    if (this.regexp_eatQuantifierPrefix(state, noError)) {
+      state.eat(0x3F /* ? */);
+      return true
+    }
+    return false
+  };
 
-  for (var i = this.scopeStack.length - 1;; i--) {
-    var scope = this$1.scopeStack[i];
-    if (scope.flags & SCOPE_VAR && !(scope.flags & SCOPE_ARROW)) { return scope }
-  }
-};
-
-var Node = function Node(parser, pos, loc) {
-  this.type = "";
-  this.start = pos;
-  this.end = 0;
-  if (parser.options.locations)
-    { this.loc = new SourceLocation(parser, loc); }
-  if (parser.options.directSourceFile)
-    { this.sourceFile = parser.options.directSourceFile; }
-  if (parser.options.ranges)
-    { this.range = [pos, 0]; }
-};
-
-// Start an AST node, attaching a start offset.
-
-var pp$6 = Parser.prototype;
-
-pp$6.startNode = function() {
-  return new Node(this, this.start, this.startLoc)
-};
-
-pp$6.startNodeAt = function(pos, loc) {
-  return new Node(this, pos, loc)
-};
-
-// Finish an AST node, adding `type` and `end` properties.
-
-function finishNodeAt(node, type, pos, loc) {
-  node.type = type;
-  node.end = pos;
-  if (this.options.locations)
-    { node.loc.end = loc; }
-  if (this.options.ranges)
-    { node.range[1] = pos; }
-  return node
-}
-
-pp$6.finishNode = function(node, type) {
-  return finishNodeAt.call(this, node, type, this.lastTokEnd, this.lastTokEndLoc)
-};
-
-// Finish node at given position
-
-pp$6.finishNodeAt = function(node, type, pos, loc) {
-  return finishNodeAt.call(this, node, type, pos, loc)
-};
-
-// The algorithm used to determine whether a regexp can appear at a
-// given point in the program is loosely based on sweet.js' approach.
-// See https://github.com/mozilla/sweet.js/wiki/design
-
-var TokContext = function TokContext(token, isExpr, preserveSpace, override, generator) {
-  this.token = token;
-  this.isExpr = !!isExpr;
-  this.preserveSpace = !!preserveSpace;
-  this.override = override;
-  this.generator = !!generator;
-};
-
-var types$1 = {
-  b_stat: new TokContext("{", false),
-  b_expr: new TokContext("{", true),
-  b_tmpl: new TokContext("${", false),
-  p_stat: new TokContext("(", false),
-  p_expr: new TokContext("(", true),
-  q_tmpl: new TokContext("`", true, true, function (p) { return p.tryReadTemplateToken(); }),
-  f_stat: new TokContext("function", false),
-  f_expr: new TokContext("function", true),
-  f_expr_gen: new TokContext("function", true, false, null, true),
-  f_gen: new TokContext("function", false, false, null, true)
-};
-
-var pp$7 = Parser.prototype;
-
-pp$7.initialContext = function() {
-  return [types$1.b_stat]
-};
-
-pp$7.braceIsBlock = function(prevType) {
-  var parent = this.curContext();
-  if (parent === types$1.f_expr || parent === types$1.f_stat)
-    { return true }
-  if (prevType === types.colon && (parent === types$1.b_stat || parent === types$1.b_expr))
-    { return !parent.isExpr }
-
-  // The check for `tt.name && exprAllowed` detects whether we are
-  // after a `yield` or `of` construct. See the `updateContext` for
-  // `tt.name`.
-  if (prevType === types._return || prevType === types.name && this.exprAllowed)
-    { return lineBreak.test(this.input.slice(this.lastTokEnd, this.start)) }
-  if (prevType === types._else || prevType === types.semi || prevType === types.eof || prevType === types.parenR || prevType === types.arrow)
-    { return true }
-  if (prevType === types.braceL)
-    { return parent === types$1.b_stat }
-  if (prevType === types._var || prevType === types._const || prevType === types.name)
-    { return false }
-  return !this.exprAllowed
-};
-
-pp$7.inGeneratorContext = function() {
-  var this$1 = this;
-
-  for (var i = this.context.length - 1; i >= 1; i--) {
-    var context = this$1.context[i];
-    if (context.token === "function")
-      { return context.generator }
-  }
-  return false
-};
-
-pp$7.updateContext = function(prevType) {
-  var update, type = this.type;
-  if (type.keyword && prevType === types.dot)
-    { this.exprAllowed = false; }
-  else if (update = type.updateContext)
-    { update.call(this, prevType); }
-  else
-    { this.exprAllowed = type.beforeExpr; }
-};
-
-// Token-specific context update code
-
-types.parenR.updateContext = types.braceR.updateContext = function() {
-  if (this.context.length === 1) {
-    this.exprAllowed = true;
-    return
-  }
-  var out = this.context.pop();
-  if (out === types$1.b_stat && this.curContext().token === "function") {
-    out = this.context.pop();
-  }
-  this.exprAllowed = !out.isExpr;
-};
-
-types.braceL.updateContext = function(prevType) {
-  this.context.push(this.braceIsBlock(prevType) ? types$1.b_stat : types$1.b_expr);
-  this.exprAllowed = true;
-};
-
-types.dollarBraceL.updateContext = function() {
-  this.context.push(types$1.b_tmpl);
-  this.exprAllowed = true;
-};
-
-types.parenL.updateContext = function(prevType) {
-  var statementParens = prevType === types._if || prevType === types._for || prevType === types._with || prevType === types._while;
-  this.context.push(statementParens ? types$1.p_stat : types$1.p_expr);
-  this.exprAllowed = true;
-};
-
-types.incDec.updateContext = function() {
-  // tokExprAllowed stays unchanged
-};
-
-types._function.updateContext = types._class.updateContext = function(prevType) {
-  if (prevType.beforeExpr && prevType !== types.semi && prevType !== types._else &&
-      !(prevType === types._return && lineBreak.test(this.input.slice(this.lastTokEnd, this.start))) &&
-      !((prevType === types.colon || prevType === types.braceL) && this.curContext() === types$1.b_stat))
-    { this.context.push(types$1.f_expr); }
-  else
-    { this.context.push(types$1.f_stat); }
-  this.exprAllowed = false;
-};
-
-types.backQuote.updateContext = function() {
-  if (this.curContext() === types$1.q_tmpl)
-    { this.context.pop(); }
-  else
-    { this.context.push(types$1.q_tmpl); }
-  this.exprAllowed = false;
-};
-
-types.star.updateContext = function(prevType) {
-  if (prevType === types._function) {
-    var index = this.context.length - 1;
-    if (this.context[index] === types$1.f_expr)
-      { this.context[index] = types$1.f_expr_gen; }
-    else
-      { this.context[index] = types$1.f_gen; }
-  }
-  this.exprAllowed = true;
-};
-
-types.name.updateContext = function(prevType) {
-  var allowed = false;
-  if (this.options.ecmaVersion >= 6 && prevType !== types.dot) {
-    if (this.value === "of" && !this.exprAllowed ||
-        this.value === "yield" && this.inGeneratorContext())
-      { allowed = true; }
-  }
-  this.exprAllowed = allowed;
-};
-
-// This file contains Unicode properties extracted from the ECMAScript
-// specification. The lists are extracted like so:
-// $$('#table-binary-unicode-properties > figure > table > tbody > tr > td:nth-child(1) code').map(el => el.innerText)
-
-// #table-binary-unicode-properties
-var ecma9BinaryProperties = "ASCII ASCII_Hex_Digit AHex Alphabetic Alpha Any Assigned Bidi_Control Bidi_C Bidi_Mirrored Bidi_M Case_Ignorable CI Cased Changes_When_Casefolded CWCF Changes_When_Casemapped CWCM Changes_When_Lowercased CWL Changes_When_NFKC_Casefolded CWKCF Changes_When_Titlecased CWT Changes_When_Uppercased CWU Dash Default_Ignorable_Code_Point DI Deprecated Dep Diacritic Dia Emoji Emoji_Component Emoji_Modifier Emoji_Modifier_Base Emoji_Presentation Extender Ext Grapheme_Base Gr_Base Grapheme_Extend Gr_Ext Hex_Digit Hex IDS_Binary_Operator IDSB IDS_Trinary_Operator IDST ID_Continue IDC ID_Start IDS Ideographic Ideo Join_Control Join_C Logical_Order_Exception LOE Lowercase Lower Math Noncharacter_Code_Point NChar Pattern_Syntax Pat_Syn Pattern_White_Space Pat_WS Quotation_Mark QMark Radical Regional_Indicator RI Sentence_Terminal STerm Soft_Dotted SD Terminal_Punctuation Term Unified_Ideograph UIdeo Uppercase Upper Variation_Selector VS White_Space space XID_Continue XIDC XID_Start XIDS";
-var unicodeBinaryProperties = {
-  9: ecma9BinaryProperties,
-  10: ecma9BinaryProperties + " Extended_Pictographic"
-};
-
-// #table-unicode-general-category-values
-var unicodeGeneralCategoryValues = "Cased_Letter LC Close_Punctuation Pe Connector_Punctuation Pc Control Cc cntrl Currency_Symbol Sc Dash_Punctuation Pd Decimal_Number Nd digit Enclosing_Mark Me Final_Punctuation Pf Format Cf Initial_Punctuation Pi Letter L Letter_Number Nl Line_Separator Zl Lowercase_Letter Ll Mark M Combining_Mark Math_Symbol Sm Modifier_Letter Lm Modifier_Symbol Sk Nonspacing_Mark Mn Number N Open_Punctuation Ps Other C Other_Letter Lo Other_Number No Other_Punctuation Po Other_Symbol So Paragraph_Separator Zp Private_Use Co Punctuation P punct Separator Z Space_Separator Zs Spacing_Mark Mc Surrogate Cs Symbol S Titlecase_Letter Lt Unassigned Cn Uppercase_Letter Lu";
-
-// #table-unicode-script-values
-var ecma9ScriptValues = "Adlam Adlm Ahom Ahom Anatolian_Hieroglyphs Hluw Arabic Arab Armenian Armn Avestan Avst Balinese Bali Bamum Bamu Bassa_Vah Bass Batak Batk Bengali Beng Bhaiksuki Bhks Bopomofo Bopo Brahmi Brah Braille Brai Buginese Bugi Buhid Buhd Canadian_Aboriginal Cans Carian Cari Caucasian_Albanian Aghb Chakma Cakm Cham Cham Cherokee Cher Common Zyyy Coptic Copt Qaac Cuneiform Xsux Cypriot Cprt Cyrillic Cyrl Deseret Dsrt Devanagari Deva Duployan Dupl Egyptian_Hieroglyphs Egyp Elbasan Elba Ethiopic Ethi Georgian Geor Glagolitic Glag Gothic Goth Grantha Gran Greek Grek Gujarati Gujr Gurmukhi Guru Han Hani Hangul Hang Hanunoo Hano Hatran Hatr Hebrew Hebr Hiragana Hira Imperial_Aramaic Armi Inherited Zinh Qaai Inscriptional_Pahlavi Phli Inscriptional_Parthian Prti Javanese Java Kaithi Kthi Kannada Knda Katakana Kana Kayah_Li Kali Kharoshthi Khar Khmer Khmr Khojki Khoj Khudawadi Sind Lao Laoo Latin Latn Lepcha Lepc Limbu Limb Linear_A Lina Linear_B Linb Lisu Lisu Lycian Lyci Lydian Lydi Mahajani Mahj Malayalam Mlym Mandaic Mand Manichaean Mani Marchen Marc Masaram_Gondi Gonm Meetei_Mayek Mtei Mende_Kikakui Mend Meroitic_Cursive Merc Meroitic_Hieroglyphs Mero Miao Plrd Modi Modi Mongolian Mong Mro Mroo Multani Mult Myanmar Mymr Nabataean Nbat New_Tai_Lue Talu Newa Newa Nko Nkoo Nushu Nshu Ogham Ogam Ol_Chiki Olck Old_Hungarian Hung Old_Italic Ital Old_North_Arabian Narb Old_Permic Perm Old_Persian Xpeo Old_South_Arabian Sarb Old_Turkic Orkh Oriya Orya Osage Osge Osmanya Osma Pahawh_Hmong Hmng Palmyrene Palm Pau_Cin_Hau Pauc Phags_Pa Phag Phoenician Phnx Psalter_Pahlavi Phlp Rejang Rjng Runic Runr Samaritan Samr Saurashtra Saur Sharada Shrd Shavian Shaw Siddham Sidd SignWriting Sgnw Sinhala Sinh Sora_Sompeng Sora Soyombo Soyo Sundanese Sund Syloti_Nagri Sylo Syriac Syrc Tagalog Tglg Tagbanwa Tagb Tai_Le Tale Tai_Tham Lana Tai_Viet Tavt Takri Takr Tamil Taml Tangut Tang Telugu Telu Thaana Thaa Thai Thai Tibetan Tibt Tifinagh Tfng Tirhuta Tirh Ugaritic Ugar Vai Vaii Warang_Citi Wara Yi Yiii Zanabazar_Square Zanb";
-var unicodeScriptValues = {
-  9: ecma9ScriptValues,
-  10: ecma9ScriptValues + " Dogra Dogr Gunjala_Gondi Gong Hanifi_Rohingya Rohg Makasar Maka Medefaidrin Medf Old_Sogdian Sogo Sogdian Sogd"
-};
-
-var data = {};
-function buildUnicodeData(ecmaVersion) {
-  var d = data[ecmaVersion] = {
-    binary: wordsRegexp(unicodeBinaryProperties[ecmaVersion] + " " + unicodeGeneralCategoryValues),
-    nonBinary: {
-      General_Category: wordsRegexp(unicodeGeneralCategoryValues),
-      Script: wordsRegexp(unicodeScriptValues[ecmaVersion])
-    }
-  };
-  d.nonBinary.Script_Extensions = d.nonBinary.Script;
-
-  d.nonBinary.gc = d.nonBinary.General_Category;
-  d.nonBinary.sc = d.nonBinary.Script;
-  d.nonBinary.scx = d.nonBinary.Script_Extensions;
-}
-buildUnicodeData(9);
-buildUnicodeData(10);
-
-var pp$9 = Parser.prototype;
-
-var RegExpValidationState = function RegExpValidationState(parser) {
-  this.parser = parser;
-  this.validFlags = "gim" + (parser.options.ecmaVersion >= 6 ? "uy" : "") + (parser.options.ecmaVersion >= 9 ? "s" : "");
-  this.unicodeProperties = data[parser.options.ecmaVersion >= 10 ? 10 : parser.options.ecmaVersion];
-  this.source = "";
-  this.flags = "";
-  this.start = 0;
-  this.switchU = false;
-  this.switchN = false;
-  this.pos = 0;
-  this.lastIntValue = 0;
-  this.lastStringValue = "";
-  this.lastAssertionIsQuantifiable = false;
-  this.numCapturingParens = 0;
-  this.maxBackReference = 0;
-  this.groupNames = [];
-  this.backReferenceNames = [];
-};
-
-RegExpValidationState.prototype.reset = function reset (start, pattern, flags) {
-  var unicode = flags.indexOf("u") !== -1;
-  this.start = start | 0;
-  this.source = pattern + "";
-  this.flags = flags;
-  this.switchU = unicode && this.parser.options.ecmaVersion >= 6;
-  this.switchN = unicode && this.parser.options.ecmaVersion >= 9;
-};
-
-RegExpValidationState.prototype.raise = function raise (message) {
-  this.parser.raiseRecoverable(this.start, ("Invalid regular expression: /" + (this.source) + "/: " + message));
-};
-
-// If u flag is given, this returns the code point at the index (it combines a surrogate pair).
-// Otherwise, this returns the code unit of the index (can be a part of a surrogate pair).
-RegExpValidationState.prototype.at = function at (i) {
-  var s = this.source;
-  var l = s.length;
-  if (i >= l) {
-    return -1
-  }
-  var c = s.charCodeAt(i);
-  if (!this.switchU || c <= 0xD7FF || c >= 0xE000 || i + 1 >= l) {
-    return c
-  }
-  return (c << 10) + s.charCodeAt(i + 1) - 0x35FDC00
-};
-
-RegExpValidationState.prototype.nextIndex = function nextIndex (i) {
-  var s = this.source;
-  var l = s.length;
-  if (i >= l) {
-    return l
-  }
-  var c = s.charCodeAt(i);
-  if (!this.switchU || c <= 0xD7FF || c >= 0xE000 || i + 1 >= l) {
-    return i + 1
-  }
-  return i + 2
-};
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-QuantifierPrefix
+  pp$8.regexp_eatQuantifierPrefix = function(state, noError) {
+    return (
+      state.eat(0x2A /* * */) ||
+      state.eat(0x2B /* + */) ||
+      state.eat(0x3F /* ? */) ||
+      this.regexp_eatBracedQuantifier(state, noError)
+    )
+  };
+  pp$8.regexp_eatBracedQuantifier = function(state, noError) {
+    var start = state.pos;
+    if (state.eat(0x7B /* { */)) {
+      var min = 0, max = -1;
+      if (this.regexp_eatDecimalDigits(state)) {
+        min = state.lastIntValue;
+        if (state.eat(0x2C /* , */) && this.regexp_eatDecimalDigits(state)) {
+          max = state.lastIntValue;
+        }
+        if (state.eat(0x7D /* } */)) {
+          // SyntaxError in https://www.ecma-international.org/ecma-262/8.0/#sec-term
+          if (max !== -1 && max < min && !noError) {
+            state.raise("numbers out of order in {} quantifier");
+          }
+          return true
+        }
+      }
+      if (state.switchU && !noError) {
+        state.raise("Incomplete quantifier");
+      }
+      state.pos = start;
+    }
+    return false
+  };
 
-RegExpValidationState.prototype.current = function current () {
-  return this.at(this.pos)
-};
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-Atom
+  pp$8.regexp_eatAtom = function(state) {
+    return (
+      this.regexp_eatPatternCharacters(state) ||
+      state.eat(0x2E /* . */) ||
+      this.regexp_eatReverseSolidusAtomEscape(state) ||
+      this.regexp_eatCharacterClass(state) ||
+      this.regexp_eatUncapturingGroup(state) ||
+      this.regexp_eatCapturingGroup(state)
+    )
+  };
+  pp$8.regexp_eatReverseSolidusAtomEscape = function(state) {
+    var start = state.pos;
+    if (state.eat(0x5C /* \ */)) {
+      if (this.regexp_eatAtomEscape(state)) {
+        return true
+      }
+      state.pos = start;
+    }
+    return false
+  };
+  pp$8.regexp_eatUncapturingGroup = function(state) {
+    var start = state.pos;
+    if (state.eat(0x28 /* ( */)) {
+      if (state.eat(0x3F /* ? */) && state.eat(0x3A /* : */)) {
+        this.regexp_disjunction(state);
+        if (state.eat(0x29 /* ) */)) {
+          return true
+        }
+        state.raise("Unterminated group");
+      }
+      state.pos = start;
+    }
+    return false
+  };
+  pp$8.regexp_eatCapturingGroup = function(state) {
+    if (state.eat(0x28 /* ( */)) {
+      if (this.options.ecmaVersion >= 9) {
+        this.regexp_groupSpecifier(state);
+      } else if (state.current() === 0x3F /* ? */) {
+        state.raise("Invalid group");
+      }
+      this.regexp_disjunction(state);
+      if (state.eat(0x29 /* ) */)) {
+        state.numCapturingParens += 1;
+        return true
+      }
+      state.raise("Unterminated group");
+    }
+    return false
+  };
 
-RegExpValidationState.prototype.lookahead = function lookahead () {
-  return this.at(this.nextIndex(this.pos))
-};
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ExtendedAtom
+  pp$8.regexp_eatExtendedAtom = function(state) {
+    return (
+      state.eat(0x2E /* . */) ||
+      this.regexp_eatReverseSolidusAtomEscape(state) ||
+      this.regexp_eatCharacterClass(state) ||
+      this.regexp_eatUncapturingGroup(state) ||
+      this.regexp_eatCapturingGroup(state) ||
+      this.regexp_eatInvalidBracedQuantifier(state) ||
+      this.regexp_eatExtendedPatternCharacter(state)
+    )
+  };
 
-RegExpValidationState.prototype.advance = function advance () {
-  this.pos = this.nextIndex(this.pos);
-};
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-InvalidBracedQuantifier
+  pp$8.regexp_eatInvalidBracedQuantifier = function(state) {
+    if (this.regexp_eatBracedQuantifier(state, true)) {
+      state.raise("Nothing to repeat");
+    }
+    return false
+  };
 
-RegExpValidationState.prototype.eat = function eat (ch) {
-  if (this.current() === ch) {
-    this.advance();
-    return true
-  }
-  return false
-};
-
-function codePointToString$1(ch) {
-  if (ch <= 0xFFFF) { return String.fromCharCode(ch) }
-  ch -= 0x10000;
-  return String.fromCharCode((ch >> 10) + 0xD800, (ch & 0x03FF) + 0xDC00)
-}
-
-/**
- * Validate the flags part of a given RegExpLiteral.
- *
- * @param {RegExpValidationState} state The state to validate RegExp.
- * @returns {void}
- */
-pp$9.validateRegExpFlags = function(state) {
-  var this$1 = this;
-
-  var validFlags = state.validFlags;
-  var flags = state.flags;
-
-  for (var i = 0; i < flags.length; i++) {
-    var flag = flags.charAt(i);
-    if (validFlags.indexOf(flag) === -1) {
-      this$1.raise(state.start, "Invalid regular expression flag");
-    }
-    if (flags.indexOf(flag, i + 1) > -1) {
-      this$1.raise(state.start, "Duplicate regular expression flag");
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-SyntaxCharacter
+  pp$8.regexp_eatSyntaxCharacter = function(state) {
+    var ch = state.current();
+    if (isSyntaxCharacter(ch)) {
+      state.lastIntValue = ch;
+      state.advance();
+      return true
     }
-  }
-};
-
-/**
- * Validate the pattern part of a given RegExpLiteral.
- *
- * @param {RegExpValidationState} state The state to validate RegExp.
- * @returns {void}
- */
-pp$9.validateRegExpPattern = function(state) {
-  this.regexp_pattern(state);
-
-  // The goal symbol for the parse is |Pattern[~U, ~N]|. If the result of
-  // parsing contains a |GroupName|, reparse with the goal symbol
-  // |Pattern[~U, +N]| and use this result instead. Throw a *SyntaxError*
-  // exception if _P_ did not conform to the grammar, if any elements of _P_
-  // were not matched by the parse, or if any Early Error conditions exist.
-  if (!state.switchN && this.options.ecmaVersion >= 9 && state.groupNames.length > 0) {
-    state.switchN = true;
-    this.regexp_pattern(state);
-  }
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-Pattern
-pp$9.regexp_pattern = function(state) {
-  state.pos = 0;
-  state.lastIntValue = 0;
-  state.lastStringValue = "";
-  state.lastAssertionIsQuantifiable = false;
-  state.numCapturingParens = 0;
-  state.maxBackReference = 0;
-  state.groupNames.length = 0;
-  state.backReferenceNames.length = 0;
-
-  this.regexp_disjunction(state);
-
-  if (state.pos !== state.source.length) {
-    // Make the same messages as V8.
-    if (state.eat(0x29 /* ) */)) {
-      state.raise("Unmatched ')'");
-    }
-    if (state.eat(0x5D /* [ */) || state.eat(0x7D /* } */)) {
-      state.raise("Lone quantifier brackets");
+    return false
+  };
+  function isSyntaxCharacter(ch) {
+    return (
+      ch === 0x24 /* $ */ ||
+      ch >= 0x28 /* ( */ && ch <= 0x2B /* + */ ||
+      ch === 0x2E /* . */ ||
+      ch === 0x3F /* ? */ ||
+      ch >= 0x5B /* [ */ && ch <= 0x5E /* ^ */ ||
+      ch >= 0x7B /* { */ && ch <= 0x7D /* } */
+    )
+  }
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-PatternCharacter
+  // But eat eager.
+  pp$8.regexp_eatPatternCharacters = function(state) {
+    var start = state.pos;
+    var ch = 0;
+    while ((ch = state.current()) !== -1 && !isSyntaxCharacter(ch)) {
+      state.advance();
     }
-  }
-  if (state.maxBackReference > state.numCapturingParens) {
-    state.raise("Invalid escape");
-  }
-  for (var i = 0, list = state.backReferenceNames; i < list.length; i += 1) {
-    var name = list[i];
+    return state.pos !== start
+  };
 
-    if (state.groupNames.indexOf(name) === -1) {
-      state.raise("Invalid named capture referenced");
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ExtendedPatternCharacter
+  pp$8.regexp_eatExtendedPatternCharacter = function(state) {
+    var ch = state.current();
+    if (
+      ch !== -1 &&
+      ch !== 0x24 /* $ */ &&
+      !(ch >= 0x28 /* ( */ && ch <= 0x2B /* + */) &&
+      ch !== 0x2E /* . */ &&
+      ch !== 0x3F /* ? */ &&
+      ch !== 0x5B /* [ */ &&
+      ch !== 0x5E /* ^ */ &&
+      ch !== 0x7C /* | */
+    ) {
+      state.advance();
+      return true
     }
-  }
-};
+    return false
+  };
 
-// https://www.ecma-international.org/ecma-262/8.0/#prod-Disjunction
-pp$9.regexp_disjunction = function(state) {
-  var this$1 = this;
+  // GroupSpecifier[U] ::
+  //   [empty]
+  //   `?` GroupName[?U]
+  pp$8.regexp_groupSpecifier = function(state) {
+    if (state.eat(0x3F /* ? */)) {
+      if (this.regexp_eatGroupName(state)) {
+        if (state.groupNames.indexOf(state.lastStringValue) !== -1) {
+          state.raise("Duplicate capture group name");
+        }
+        state.groupNames.push(state.lastStringValue);
+        return
+      }
+      state.raise("Invalid group");
+    }
+  };
 
-  this.regexp_alternative(state);
-  while (state.eat(0x7C /* | */)) {
-    this$1.regexp_alternative(state);
-  }
+  // GroupName[U] ::
+  //   `<` RegExpIdentifierName[?U] `>`
+  // Note: this updates `state.lastStringValue` property with the eaten name.
+  pp$8.regexp_eatGroupName = function(state) {
+    state.lastStringValue = "";
+    if (state.eat(0x3C /* < */)) {
+      if (this.regexp_eatRegExpIdentifierName(state) && state.eat(0x3E /* > */)) {
+        return true
+      }
+      state.raise("Invalid capture group name");
+    }
+    return false
+  };
 
-  // Make the same message as V8.
-  if (this.regexp_eatQuantifier(state, true)) {
-    state.raise("Nothing to repeat");
-  }
-  if (state.eat(0x7B /* { */)) {
-    state.raise("Lone quantifier brackets");
-  }
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-Alternative
-pp$9.regexp_alternative = function(state) {
-  while (state.pos < state.source.length && this.regexp_eatTerm(state))
-    {  }
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Term
-pp$9.regexp_eatTerm = function(state) {
-  if (this.regexp_eatAssertion(state)) {
-    // Handle `QuantifiableAssertion Quantifier` alternative.
-    // `state.lastAssertionIsQuantifiable` is true if the last eaten Assertion
-    // is a QuantifiableAssertion.
-    if (state.lastAssertionIsQuantifiable && this.regexp_eatQuantifier(state)) {
-      // Make the same message as V8.
-      if (state.switchU) {
-        state.raise("Invalid quantifier");
+  // RegExpIdentifierName[U] ::
+  //   RegExpIdentifierStart[?U]
+  //   RegExpIdentifierName[?U] RegExpIdentifierPart[?U]
+  // Note: this updates `state.lastStringValue` property with the eaten name.
+  pp$8.regexp_eatRegExpIdentifierName = function(state) {
+    state.lastStringValue = "";
+    if (this.regexp_eatRegExpIdentifierStart(state)) {
+      state.lastStringValue += codePointToString(state.lastIntValue);
+      while (this.regexp_eatRegExpIdentifierPart(state)) {
+        state.lastStringValue += codePointToString(state.lastIntValue);
       }
+      return true
     }
-    return true
-  }
+    return false
+  };
 
-  if (state.switchU ? this.regexp_eatAtom(state) : this.regexp_eatExtendedAtom(state)) {
-    this.regexp_eatQuantifier(state);
-    return true
-  }
+  // RegExpIdentifierStart[U] ::
+  //   UnicodeIDStart
+  //   `$`
+  //   `_`
+  //   `\` RegExpUnicodeEscapeSequence[?U]
+  pp$8.regexp_eatRegExpIdentifierStart = function(state) {
+    var start = state.pos;
+    var ch = state.current();
+    state.advance();
+
+    if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state)) {
+      ch = state.lastIntValue;
+    }
+    if (isRegExpIdentifierStart(ch)) {
+      state.lastIntValue = ch;
+      return true
+    }
 
-  return false
-};
+    state.pos = start;
+    return false
+  };
+  function isRegExpIdentifierStart(ch) {
+    return isIdentifierStart(ch, true) || ch === 0x24 /* $ */ || ch === 0x5F /* _ */
+  }
+
+  // RegExpIdentifierPart[U] ::
+  //   UnicodeIDContinue
+  //   `$`
+  //   `_`
+  //   `\` RegExpUnicodeEscapeSequence[?U]
+  //   <ZWNJ>
+  //   <ZWJ>
+  pp$8.regexp_eatRegExpIdentifierPart = function(state) {
+    var start = state.pos;
+    var ch = state.current();
+    state.advance();
 
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Assertion
-pp$9.regexp_eatAssertion = function(state) {
-  var start = state.pos;
-  state.lastAssertionIsQuantifiable = false;
+    if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state)) {
+      ch = state.lastIntValue;
+    }
+    if (isRegExpIdentifierPart(ch)) {
+      state.lastIntValue = ch;
+      return true
+    }
 
-  // ^, $
-  if (state.eat(0x5E /* ^ */) || state.eat(0x24 /* $ */)) {
-    return true
+    state.pos = start;
+    return false
+  };
+  function isRegExpIdentifierPart(ch) {
+    return isIdentifierChar(ch, true) || ch === 0x24 /* $ */ || ch === 0x5F /* _ */ || ch === 0x200C /* <ZWNJ> */ || ch === 0x200D /* <ZWJ> */
   }
 
-  // \b \B
-  if (state.eat(0x5C /* \ */)) {
-    if (state.eat(0x42 /* B */) || state.eat(0x62 /* b */)) {
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-AtomEscape
+  pp$8.regexp_eatAtomEscape = function(state) {
+    if (
+      this.regexp_eatBackReference(state) ||
+      this.regexp_eatCharacterClassEscape(state) ||
+      this.regexp_eatCharacterEscape(state) ||
+      (state.switchN && this.regexp_eatKGroupName(state))
+    ) {
       return true
     }
-    state.pos = start;
-  }
-
-  // Lookahead / Lookbehind
-  if (state.eat(0x28 /* ( */) && state.eat(0x3F /* ? */)) {
-    var lookbehind = false;
-    if (this.options.ecmaVersion >= 9) {
-      lookbehind = state.eat(0x3C /* < */);
+    if (state.switchU) {
+      // Make the same message as V8.
+      if (state.current() === 0x63 /* c */) {
+        state.raise("Invalid unicode escape");
+      }
+      state.raise("Invalid escape");
     }
-    if (state.eat(0x3D /* = */) || state.eat(0x21 /* ! */)) {
-      this.regexp_disjunction(state);
-      if (!state.eat(0x29 /* ) */)) {
-        state.raise("Unterminated group");
+    return false
+  };
+  pp$8.regexp_eatBackReference = function(state) {
+    var start = state.pos;
+    if (this.regexp_eatDecimalEscape(state)) {
+      var n = state.lastIntValue;
+      if (state.switchU) {
+        // For SyntaxError in https://www.ecma-international.org/ecma-262/8.0/#sec-atomescape
+        if (n > state.maxBackReference) {
+          state.maxBackReference = n;
+        }
+        return true
       }
-      state.lastAssertionIsQuantifiable = !lookbehind;
-      return true
+      if (n <= state.numCapturingParens) {
+        return true
+      }
+      state.pos = start;
     }
-  }
-
-  state.pos = start;
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-Quantifier
-pp$9.regexp_eatQuantifier = function(state, noError) {
-  if ( noError === void 0 ) noError = false;
-
-  if (this.regexp_eatQuantifierPrefix(state, noError)) {
-    state.eat(0x3F /* ? */);
-    return true
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-QuantifierPrefix
-pp$9.regexp_eatQuantifierPrefix = function(state, noError) {
-  return (
-    state.eat(0x2A /* * */) ||
-    state.eat(0x2B /* + */) ||
-    state.eat(0x3F /* ? */) ||
-    this.regexp_eatBracedQuantifier(state, noError)
-  )
-};
-pp$9.regexp_eatBracedQuantifier = function(state, noError) {
-  var start = state.pos;
-  if (state.eat(0x7B /* { */)) {
-    var min = 0, max = -1;
-    if (this.regexp_eatDecimalDigits(state)) {
-      min = state.lastIntValue;
-      if (state.eat(0x2C /* , */) && this.regexp_eatDecimalDigits(state)) {
-        max = state.lastIntValue;
+    return false
+  };
+  pp$8.regexp_eatKGroupName = function(state) {
+    if (state.eat(0x6B /* k */)) {
+      if (this.regexp_eatGroupName(state)) {
+        state.backReferenceNames.push(state.lastStringValue);
+        return true
       }
-      if (state.eat(0x7D /* } */)) {
-        // SyntaxError in https://www.ecma-international.org/ecma-262/8.0/#sec-term
-        if (max !== -1 && max < min && !noError) {
-          state.raise("numbers out of order in {} quantifier");
-        }
+      state.raise("Invalid named reference");
+    }
+    return false
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-CharacterEscape
+  pp$8.regexp_eatCharacterEscape = function(state) {
+    return (
+      this.regexp_eatControlEscape(state) ||
+      this.regexp_eatCControlLetter(state) ||
+      this.regexp_eatZero(state) ||
+      this.regexp_eatHexEscapeSequence(state) ||
+      this.regexp_eatRegExpUnicodeEscapeSequence(state) ||
+      (!state.switchU && this.regexp_eatLegacyOctalEscapeSequence(state)) ||
+      this.regexp_eatIdentityEscape(state)
+    )
+  };
+  pp$8.regexp_eatCControlLetter = function(state) {
+    var start = state.pos;
+    if (state.eat(0x63 /* c */)) {
+      if (this.regexp_eatControlLetter(state)) {
         return true
       }
+      state.pos = start;
     }
-    if (state.switchU && !noError) {
-      state.raise("Incomplete quantifier");
+    return false
+  };
+  pp$8.regexp_eatZero = function(state) {
+    if (state.current() === 0x30 /* 0 */ && !isDecimalDigit(state.lookahead())) {
+      state.lastIntValue = 0;
+      state.advance();
+      return true
     }
-    state.pos = start;
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-Atom
-pp$9.regexp_eatAtom = function(state) {
-  return (
-    this.regexp_eatPatternCharacters(state) ||
-    state.eat(0x2E /* . */) ||
-    this.regexp_eatReverseSolidusAtomEscape(state) ||
-    this.regexp_eatCharacterClass(state) ||
-    this.regexp_eatUncapturingGroup(state) ||
-    this.regexp_eatCapturingGroup(state)
-  )
-};
-pp$9.regexp_eatReverseSolidusAtomEscape = function(state) {
-  var start = state.pos;
-  if (state.eat(0x5C /* \ */)) {
-    if (this.regexp_eatAtomEscape(state)) {
+    return false
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-ControlEscape
+  pp$8.regexp_eatControlEscape = function(state) {
+    var ch = state.current();
+    if (ch === 0x74 /* t */) {
+      state.lastIntValue = 0x09; /* \t */
+      state.advance();
       return true
     }
-    state.pos = start;
-  }
-  return false
-};
-pp$9.regexp_eatUncapturingGroup = function(state) {
-  var start = state.pos;
-  if (state.eat(0x28 /* ( */)) {
-    if (state.eat(0x3F /* ? */) && state.eat(0x3A /* : */)) {
-      this.regexp_disjunction(state);
-      if (state.eat(0x29 /* ) */)) {
-        return true
-      }
-      state.raise("Unterminated group");
+    if (ch === 0x6E /* n */) {
+      state.lastIntValue = 0x0A; /* \n */
+      state.advance();
+      return true
     }
-    state.pos = start;
-  }
-  return false
-};
-pp$9.regexp_eatCapturingGroup = function(state) {
-  if (state.eat(0x28 /* ( */)) {
-    if (this.options.ecmaVersion >= 9) {
-      this.regexp_groupSpecifier(state);
-    } else if (state.current() === 0x3F /* ? */) {
-      state.raise("Invalid group");
+    if (ch === 0x76 /* v */) {
+      state.lastIntValue = 0x0B; /* \v */
+      state.advance();
+      return true
     }
-    this.regexp_disjunction(state);
-    if (state.eat(0x29 /* ) */)) {
-      state.numCapturingParens += 1;
+    if (ch === 0x66 /* f */) {
+      state.lastIntValue = 0x0C; /* \f */
+      state.advance();
       return true
     }
-    state.raise("Unterminated group");
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ExtendedAtom
-pp$9.regexp_eatExtendedAtom = function(state) {
-  return (
-    state.eat(0x2E /* . */) ||
-    this.regexp_eatReverseSolidusAtomEscape(state) ||
-    this.regexp_eatCharacterClass(state) ||
-    this.regexp_eatUncapturingGroup(state) ||
-    this.regexp_eatCapturingGroup(state) ||
-    this.regexp_eatInvalidBracedQuantifier(state) ||
-    this.regexp_eatExtendedPatternCharacter(state)
-  )
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-InvalidBracedQuantifier
-pp$9.regexp_eatInvalidBracedQuantifier = function(state) {
-  if (this.regexp_eatBracedQuantifier(state, true)) {
-    state.raise("Nothing to repeat");
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-SyntaxCharacter
-pp$9.regexp_eatSyntaxCharacter = function(state) {
-  var ch = state.current();
-  if (isSyntaxCharacter(ch)) {
-    state.lastIntValue = ch;
-    state.advance();
-    return true
-  }
-  return false
-};
-function isSyntaxCharacter(ch) {
-  return (
-    ch === 0x24 /* $ */ ||
-    ch >= 0x28 /* ( */ && ch <= 0x2B /* + */ ||
-    ch === 0x2E /* . */ ||
-    ch === 0x3F /* ? */ ||
-    ch >= 0x5B /* [ */ && ch <= 0x5E /* ^ */ ||
-    ch >= 0x7B /* { */ && ch <= 0x7D /* } */
-  )
-}
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-PatternCharacter
-// But eat eager.
-pp$9.regexp_eatPatternCharacters = function(state) {
-  var start = state.pos;
-  var ch = 0;
-  while ((ch = state.current()) !== -1 && !isSyntaxCharacter(ch)) {
-    state.advance();
-  }
-  return state.pos !== start
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ExtendedPatternCharacter
-pp$9.regexp_eatExtendedPatternCharacter = function(state) {
-  var ch = state.current();
-  if (
-    ch !== -1 &&
-    ch !== 0x24 /* $ */ &&
-    !(ch >= 0x28 /* ( */ && ch <= 0x2B /* + */) &&
-    ch !== 0x2E /* . */ &&
-    ch !== 0x3F /* ? */ &&
-    ch !== 0x5B /* [ */ &&
-    ch !== 0x5E /* ^ */ &&
-    ch !== 0x7C /* | */
-  ) {
-    state.advance();
-    return true
-  }
-  return false
-};
-
-// GroupSpecifier[U] ::
-//   [empty]
-//   `?` GroupName[?U]
-pp$9.regexp_groupSpecifier = function(state) {
-  if (state.eat(0x3F /* ? */)) {
-    if (this.regexp_eatGroupName(state)) {
-      if (state.groupNames.indexOf(state.lastStringValue) !== -1) {
-        state.raise("Duplicate capture group name");
-      }
-      state.groupNames.push(state.lastStringValue);
-      return
+    if (ch === 0x72 /* r */) {
+      state.lastIntValue = 0x0D; /* \r */
+      state.advance();
+      return true
     }
-    state.raise("Invalid group");
-  }
-};
-
-// GroupName[U] ::
-//   `<` RegExpIdentifierName[?U] `>`
-// Note: this updates `state.lastStringValue` property with the eaten name.
-pp$9.regexp_eatGroupName = function(state) {
-  state.lastStringValue = "";
-  if (state.eat(0x3C /* < */)) {
-    if (this.regexp_eatRegExpIdentifierName(state) && state.eat(0x3E /* > */)) {
+    return false
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-ControlLetter
+  pp$8.regexp_eatControlLetter = function(state) {
+    var ch = state.current();
+    if (isControlLetter(ch)) {
+      state.lastIntValue = ch % 0x20;
+      state.advance();
       return true
     }
-    state.raise("Invalid capture group name");
-  }
-  return false
-};
-
-// RegExpIdentifierName[U] ::
-//   RegExpIdentifierStart[?U]
-//   RegExpIdentifierName[?U] RegExpIdentifierPart[?U]
-// Note: this updates `state.lastStringValue` property with the eaten name.
-pp$9.regexp_eatRegExpIdentifierName = function(state) {
-  state.lastStringValue = "";
-  if (this.regexp_eatRegExpIdentifierStart(state)) {
-    state.lastStringValue += codePointToString$1(state.lastIntValue);
-    while (this.regexp_eatRegExpIdentifierPart(state)) {
-      state.lastStringValue += codePointToString$1(state.lastIntValue);
+    return false
+  };
+  function isControlLetter(ch) {
+    return (
+      (ch >= 0x41 /* A */ && ch <= 0x5A /* Z */) ||
+      (ch >= 0x61 /* a */ && ch <= 0x7A /* z */)
+    )
+  }
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-RegExpUnicodeEscapeSequence
+  pp$8.regexp_eatRegExpUnicodeEscapeSequence = function(state) {
+    var start = state.pos;
+
+    if (state.eat(0x75 /* u */)) {
+      if (this.regexp_eatFixedHexDigits(state, 4)) {
+        var lead = state.lastIntValue;
+        if (state.switchU && lead >= 0xD800 && lead <= 0xDBFF) {
+          var leadSurrogateEnd = state.pos;
+          if (state.eat(0x5C /* \ */) && state.eat(0x75 /* u */) && this.regexp_eatFixedHexDigits(state, 4)) {
+            var trail = state.lastIntValue;
+            if (trail >= 0xDC00 && trail <= 0xDFFF) {
+              state.lastIntValue = (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
+              return true
+            }
+          }
+          state.pos = leadSurrogateEnd;
+          state.lastIntValue = lead;
+        }
+        return true
+      }
+      if (
+        state.switchU &&
+        state.eat(0x7B /* { */) &&
+        this.regexp_eatHexDigits(state) &&
+        state.eat(0x7D /* } */) &&
+        isValidUnicode(state.lastIntValue)
+      ) {
+        return true
+      }
+      if (state.switchU) {
+        state.raise("Invalid unicode escape");
+      }
+      state.pos = start;
     }
-    return true
-  }
-  return false
-};
-
-// RegExpIdentifierStart[U] ::
-//   UnicodeIDStart
-//   `$`
-//   `_`
-//   `\` RegExpUnicodeEscapeSequence[?U]
-pp$9.regexp_eatRegExpIdentifierStart = function(state) {
-  var start = state.pos;
-  var ch = state.current();
-  state.advance();
-
-  if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state)) {
-    ch = state.lastIntValue;
-  }
-  if (isRegExpIdentifierStart(ch)) {
-    state.lastIntValue = ch;
-    return true
-  }
 
-  state.pos = start;
-  return false
-};
-function isRegExpIdentifierStart(ch) {
-  return isIdentifierStart(ch, true) || ch === 0x24 /* $ */ || ch === 0x5F /* _ */
-}
-
-// RegExpIdentifierPart[U] ::
-//   UnicodeIDContinue
-//   `$`
-//   `_`
-//   `\` RegExpUnicodeEscapeSequence[?U]
-//   <ZWNJ>
-//   <ZWJ>
-pp$9.regexp_eatRegExpIdentifierPart = function(state) {
-  var start = state.pos;
-  var ch = state.current();
-  state.advance();
-
-  if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state)) {
-    ch = state.lastIntValue;
-  }
-  if (isRegExpIdentifierPart(ch)) {
-    state.lastIntValue = ch;
-    return true
+    return false
+  };
+  function isValidUnicode(ch) {
+    return ch >= 0 && ch <= 0x10FFFF
   }
 
-  state.pos = start;
-  return false
-};
-function isRegExpIdentifierPart(ch) {
-  return isIdentifierChar(ch, true) || ch === 0x24 /* $ */ || ch === 0x5F /* _ */ || ch === 0x200C /* <ZWNJ> */ || ch === 0x200D /* <ZWJ> */
-}
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-AtomEscape
-pp$9.regexp_eatAtomEscape = function(state) {
-  if (
-    this.regexp_eatBackReference(state) ||
-    this.regexp_eatCharacterClassEscape(state) ||
-    this.regexp_eatCharacterEscape(state) ||
-    (state.switchN && this.regexp_eatKGroupName(state))
-  ) {
-    return true
-  }
-  if (state.switchU) {
-    // Make the same message as V8.
-    if (state.current() === 0x63 /* c */) {
-      state.raise("Invalid unicode escape");
-    }
-    state.raise("Invalid escape");
-  }
-  return false
-};
-pp$9.regexp_eatBackReference = function(state) {
-  var start = state.pos;
-  if (this.regexp_eatDecimalEscape(state)) {
-    var n = state.lastIntValue;
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-IdentityEscape
+  pp$8.regexp_eatIdentityEscape = function(state) {
     if (state.switchU) {
-      // For SyntaxError in https://www.ecma-international.org/ecma-262/8.0/#sec-atomescape
-      if (n > state.maxBackReference) {
-        state.maxBackReference = n;
+      if (this.regexp_eatSyntaxCharacter(state)) {
+        return true
       }
-      return true
-    }
-    if (n <= state.numCapturingParens) {
-      return true
+      if (state.eat(0x2F /* / */)) {
+        state.lastIntValue = 0x2F; /* / */
+        return true
+      }
+      return false
     }
-    state.pos = start;
-  }
-  return false
-};
-pp$9.regexp_eatKGroupName = function(state) {
-  if (state.eat(0x6B /* k */)) {
-    if (this.regexp_eatGroupName(state)) {
-      state.backReferenceNames.push(state.lastStringValue);
+
+    var ch = state.current();
+    if (ch !== 0x63 /* c */ && (!state.switchN || ch !== 0x6B /* k */)) {
+      state.lastIntValue = ch;
+      state.advance();
       return true
     }
-    state.raise("Invalid named reference");
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-CharacterEscape
-pp$9.regexp_eatCharacterEscape = function(state) {
-  return (
-    this.regexp_eatControlEscape(state) ||
-    this.regexp_eatCControlLetter(state) ||
-    this.regexp_eatZero(state) ||
-    this.regexp_eatHexEscapeSequence(state) ||
-    this.regexp_eatRegExpUnicodeEscapeSequence(state) ||
-    (!state.switchU && this.regexp_eatLegacyOctalEscapeSequence(state)) ||
-    this.regexp_eatIdentityEscape(state)
-  )
-};
-pp$9.regexp_eatCControlLetter = function(state) {
-  var start = state.pos;
-  if (state.eat(0x63 /* c */)) {
-    if (this.regexp_eatControlLetter(state)) {
+
+    return false
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-DecimalEscape
+  pp$8.regexp_eatDecimalEscape = function(state) {
+    state.lastIntValue = 0;
+    var ch = state.current();
+    if (ch >= 0x31 /* 1 */ && ch <= 0x39 /* 9 */) {
+      do {
+        state.lastIntValue = 10 * state.lastIntValue + (ch - 0x30 /* 0 */);
+        state.advance();
+      } while ((ch = state.current()) >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */)
       return true
     }
-    state.pos = start;
-  }
-  return false
-};
-pp$9.regexp_eatZero = function(state) {
-  if (state.current() === 0x30 /* 0 */ && !isDecimalDigit(state.lookahead())) {
-    state.lastIntValue = 0;
-    state.advance();
-    return true
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-ControlEscape
-pp$9.regexp_eatControlEscape = function(state) {
-  var ch = state.current();
-  if (ch === 0x74 /* t */) {
-    state.lastIntValue = 0x09; /* \t */
-    state.advance();
-    return true
-  }
-  if (ch === 0x6E /* n */) {
-    state.lastIntValue = 0x0A; /* \n */
-    state.advance();
-    return true
-  }
-  if (ch === 0x76 /* v */) {
-    state.lastIntValue = 0x0B; /* \v */
-    state.advance();
-    return true
-  }
-  if (ch === 0x66 /* f */) {
-    state.lastIntValue = 0x0C; /* \f */
-    state.advance();
-    return true
-  }
-  if (ch === 0x72 /* r */) {
-    state.lastIntValue = 0x0D; /* \r */
-    state.advance();
-    return true
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-ControlLetter
-pp$9.regexp_eatControlLetter = function(state) {
-  var ch = state.current();
-  if (isControlLetter(ch)) {
-    state.lastIntValue = ch % 0x20;
-    state.advance();
-    return true
-  }
-  return false
-};
-function isControlLetter(ch) {
-  return (
-    (ch >= 0x41 /* A */ && ch <= 0x5A /* Z */) ||
-    (ch >= 0x61 /* a */ && ch <= 0x7A /* z */)
-  )
-}
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-RegExpUnicodeEscapeSequence
-pp$9.regexp_eatRegExpUnicodeEscapeSequence = function(state) {
-  var start = state.pos;
-
-  if (state.eat(0x75 /* u */)) {
-    if (this.regexp_eatFixedHexDigits(state, 4)) {
-      var lead = state.lastIntValue;
-      if (state.switchU && lead >= 0xD800 && lead <= 0xDBFF) {
-        var leadSurrogateEnd = state.pos;
-        if (state.eat(0x5C /* \ */) && state.eat(0x75 /* u */) && this.regexp_eatFixedHexDigits(state, 4)) {
-          var trail = state.lastIntValue;
-          if (trail >= 0xDC00 && trail <= 0xDFFF) {
-            state.lastIntValue = (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
-            return true
-          }
-        }
-        state.pos = leadSurrogateEnd;
-        state.lastIntValue = lead;
-      }
+    return false
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClassEscape
+  pp$8.regexp_eatCharacterClassEscape = function(state) {
+    var ch = state.current();
+
+    if (isCharacterClassEscape(ch)) {
+      state.lastIntValue = -1;
+      state.advance();
       return true
     }
+
     if (
       state.switchU &&
-      state.eat(0x7B /* { */) &&
-      this.regexp_eatHexDigits(state) &&
-      state.eat(0x7D /* } */) &&
-      isValidUnicode(state.lastIntValue)
+      this.options.ecmaVersion >= 9 &&
+      (ch === 0x50 /* P */ || ch === 0x70 /* p */)
     ) {
-      return true
+      state.lastIntValue = -1;
+      state.advance();
+      if (
+        state.eat(0x7B /* { */) &&
+        this.regexp_eatUnicodePropertyValueExpression(state) &&
+        state.eat(0x7D /* } */)
+      ) {
+        return true
+      }
+      state.raise("Invalid property name");
     }
-    if (state.switchU) {
-      state.raise("Invalid unicode escape");
+
+    return false
+  };
+  function isCharacterClassEscape(ch) {
+    return (
+      ch === 0x64 /* d */ ||
+      ch === 0x44 /* D */ ||
+      ch === 0x73 /* s */ ||
+      ch === 0x53 /* S */ ||
+      ch === 0x77 /* w */ ||
+      ch === 0x57 /* W */
+    )
+  }
+
+  // UnicodePropertyValueExpression ::
+  //   UnicodePropertyName `=` UnicodePropertyValue
+  //   LoneUnicodePropertyNameOrValue
+  pp$8.regexp_eatUnicodePropertyValueExpression = function(state) {
+    var start = state.pos;
+
+    // UnicodePropertyName `=` UnicodePropertyValue
+    if (this.regexp_eatUnicodePropertyName(state) && state.eat(0x3D /* = */)) {
+      var name = state.lastStringValue;
+      if (this.regexp_eatUnicodePropertyValue(state)) {
+        var value = state.lastStringValue;
+        this.regexp_validateUnicodePropertyNameAndValue(state, name, value);
+        return true
+      }
     }
     state.pos = start;
-  }
 
-  return false
-};
-function isValidUnicode(ch) {
-  return ch >= 0 && ch <= 0x10FFFF
-}
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-IdentityEscape
-pp$9.regexp_eatIdentityEscape = function(state) {
-  if (state.switchU) {
-    if (this.regexp_eatSyntaxCharacter(state)) {
-      return true
-    }
-    if (state.eat(0x2F /* / */)) {
-      state.lastIntValue = 0x2F; /* / */
+    // LoneUnicodePropertyNameOrValue
+    if (this.regexp_eatLoneUnicodePropertyNameOrValue(state)) {
+      var nameOrValue = state.lastStringValue;
+      this.regexp_validateUnicodePropertyNameOrValue(state, nameOrValue);
       return true
     }
     return false
-  }
+  };
+  pp$8.regexp_validateUnicodePropertyNameAndValue = function(state, name, value) {
+    if (!has(state.unicodeProperties.nonBinary, name))
+      { state.raise("Invalid property name"); }
+    if (!state.unicodeProperties.nonBinary[name].test(value))
+      { state.raise("Invalid property value"); }
+  };
+  pp$8.regexp_validateUnicodePropertyNameOrValue = function(state, nameOrValue) {
+    if (!state.unicodeProperties.binary.test(nameOrValue))
+      { state.raise("Invalid property name"); }
+  };
 
-  var ch = state.current();
-  if (ch !== 0x63 /* c */ && (!state.switchN || ch !== 0x6B /* k */)) {
-    state.lastIntValue = ch;
-    state.advance();
-    return true
+  // UnicodePropertyName ::
+  //   UnicodePropertyNameCharacters
+  pp$8.regexp_eatUnicodePropertyName = function(state) {
+    var ch = 0;
+    state.lastStringValue = "";
+    while (isUnicodePropertyNameCharacter(ch = state.current())) {
+      state.lastStringValue += codePointToString(ch);
+      state.advance();
+    }
+    return state.lastStringValue !== ""
+  };
+  function isUnicodePropertyNameCharacter(ch) {
+    return isControlLetter(ch) || ch === 0x5F /* _ */
   }
 
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-DecimalEscape
-pp$9.regexp_eatDecimalEscape = function(state) {
-  state.lastIntValue = 0;
-  var ch = state.current();
-  if (ch >= 0x31 /* 1 */ && ch <= 0x39 /* 9 */) {
-    do {
-      state.lastIntValue = 10 * state.lastIntValue + (ch - 0x30 /* 0 */);
+  // UnicodePropertyValue ::
+  //   UnicodePropertyValueCharacters
+  pp$8.regexp_eatUnicodePropertyValue = function(state) {
+    var ch = 0;
+    state.lastStringValue = "";
+    while (isUnicodePropertyValueCharacter(ch = state.current())) {
+      state.lastStringValue += codePointToString(ch);
       state.advance();
-    } while ((ch = state.current()) >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */)
-    return true
+    }
+    return state.lastStringValue !== ""
+  };
+  function isUnicodePropertyValueCharacter(ch) {
+    return isUnicodePropertyNameCharacter(ch) || isDecimalDigit(ch)
   }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClassEscape
-pp$9.regexp_eatCharacterClassEscape = function(state) {
-  var ch = state.current();
 
-  if (isCharacterClassEscape(ch)) {
-    state.lastIntValue = -1;
-    state.advance();
-    return true
-  }
+  // LoneUnicodePropertyNameOrValue ::
+  //   UnicodePropertyValueCharacters
+  pp$8.regexp_eatLoneUnicodePropertyNameOrValue = function(state) {
+    return this.regexp_eatUnicodePropertyValue(state)
+  };
 
-  if (
-    state.switchU &&
-    this.options.ecmaVersion >= 9 &&
-    (ch === 0x50 /* P */ || ch === 0x70 /* p */)
-  ) {
-    state.lastIntValue = -1;
-    state.advance();
-    if (
-      state.eat(0x7B /* { */) &&
-      this.regexp_eatUnicodePropertyValueExpression(state) &&
-      state.eat(0x7D /* } */)
-    ) {
-      return true
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClass
+  pp$8.regexp_eatCharacterClass = function(state) {
+    if (state.eat(0x5B /* [ */)) {
+      state.eat(0x5E /* ^ */);
+      this.regexp_classRanges(state);
+      if (state.eat(0x5D /* [ */)) {
+        return true
+      }
+      // Unreachable since it threw "unterminated regular expression" error before.
+      state.raise("Unterminated character class");
     }
-    state.raise("Invalid property name");
-  }
+    return false
+  };
 
-  return false
-};
-function isCharacterClassEscape(ch) {
-  return (
-    ch === 0x64 /* d */ ||
-    ch === 0x44 /* D */ ||
-    ch === 0x73 /* s */ ||
-    ch === 0x53 /* S */ ||
-    ch === 0x77 /* w */ ||
-    ch === 0x57 /* W */
-  )
-}
-
-// UnicodePropertyValueExpression ::
-//   UnicodePropertyName `=` UnicodePropertyValue
-//   LoneUnicodePropertyNameOrValue
-pp$9.regexp_eatUnicodePropertyValueExpression = function(state) {
-  var start = state.pos;
-
-  // UnicodePropertyName `=` UnicodePropertyValue
-  if (this.regexp_eatUnicodePropertyName(state) && state.eat(0x3D /* = */)) {
-    var name = state.lastStringValue;
-    if (this.regexp_eatUnicodePropertyValue(state)) {
-      var value = state.lastStringValue;
-      this.regexp_validateUnicodePropertyNameAndValue(state, name, value);
-      return true
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-ClassRanges
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-NonemptyClassRanges
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-NonemptyClassRangesNoDash
+  pp$8.regexp_classRanges = function(state) {
+    while (this.regexp_eatClassAtom(state)) {
+      var left = state.lastIntValue;
+      if (state.eat(0x2D /* - */) && this.regexp_eatClassAtom(state)) {
+        var right = state.lastIntValue;
+        if (state.switchU && (left === -1 || right === -1)) {
+          state.raise("Invalid character class");
+        }
+        if (left !== -1 && right !== -1 && left > right) {
+          state.raise("Range out of order in character class");
+        }
+      }
     }
-  }
-  state.pos = start;
+  };
 
-  // LoneUnicodePropertyNameOrValue
-  if (this.regexp_eatLoneUnicodePropertyNameOrValue(state)) {
-    var nameOrValue = state.lastStringValue;
-    this.regexp_validateUnicodePropertyNameOrValue(state, nameOrValue);
-    return true
-  }
-  return false
-};
-pp$9.regexp_validateUnicodePropertyNameAndValue = function(state, name, value) {
-  if (!has(state.unicodeProperties.nonBinary, name))
-    { state.raise("Invalid property name"); }
-  if (!state.unicodeProperties.nonBinary[name].test(value))
-    { state.raise("Invalid property value"); }
-};
-pp$9.regexp_validateUnicodePropertyNameOrValue = function(state, nameOrValue) {
-  if (!state.unicodeProperties.binary.test(nameOrValue))
-    { state.raise("Invalid property name"); }
-};
-
-// UnicodePropertyName ::
-//   UnicodePropertyNameCharacters
-pp$9.regexp_eatUnicodePropertyName = function(state) {
-  var ch = 0;
-  state.lastStringValue = "";
-  while (isUnicodePropertyNameCharacter(ch = state.current())) {
-    state.lastStringValue += codePointToString$1(ch);
-    state.advance();
-  }
-  return state.lastStringValue !== ""
-};
-function isUnicodePropertyNameCharacter(ch) {
-  return isControlLetter(ch) || ch === 0x5F /* _ */
-}
-
-// UnicodePropertyValue ::
-//   UnicodePropertyValueCharacters
-pp$9.regexp_eatUnicodePropertyValue = function(state) {
-  var ch = 0;
-  state.lastStringValue = "";
-  while (isUnicodePropertyValueCharacter(ch = state.current())) {
-    state.lastStringValue += codePointToString$1(ch);
-    state.advance();
-  }
-  return state.lastStringValue !== ""
-};
-function isUnicodePropertyValueCharacter(ch) {
-  return isUnicodePropertyNameCharacter(ch) || isDecimalDigit(ch)
-}
-
-// LoneUnicodePropertyNameOrValue ::
-//   UnicodePropertyValueCharacters
-pp$9.regexp_eatLoneUnicodePropertyNameOrValue = function(state) {
-  return this.regexp_eatUnicodePropertyValue(state)
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClass
-pp$9.regexp_eatCharacterClass = function(state) {
-  if (state.eat(0x5B /* [ */)) {
-    state.eat(0x5E /* ^ */);
-    this.regexp_classRanges(state);
-    if (state.eat(0x5D /* [ */)) {
-      return true
-    }
-    // Unreachable since it threw "unterminated regular expression" error before.
-    state.raise("Unterminated character class");
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-ClassRanges
-// https://www.ecma-international.org/ecma-262/8.0/#prod-NonemptyClassRanges
-// https://www.ecma-international.org/ecma-262/8.0/#prod-NonemptyClassRangesNoDash
-pp$9.regexp_classRanges = function(state) {
-  var this$1 = this;
-
-  while (this.regexp_eatClassAtom(state)) {
-    var left = state.lastIntValue;
-    if (state.eat(0x2D /* - */) && this$1.regexp_eatClassAtom(state)) {
-      var right = state.lastIntValue;
-      if (state.switchU && (left === -1 || right === -1)) {
-        state.raise("Invalid character class");
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-ClassAtom
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-ClassAtomNoDash
+  pp$8.regexp_eatClassAtom = function(state) {
+    var start = state.pos;
+
+    if (state.eat(0x5C /* \ */)) {
+      if (this.regexp_eatClassEscape(state)) {
+        return true
       }
-      if (left !== -1 && right !== -1 && left > right) {
-        state.raise("Range out of order in character class");
+      if (state.switchU) {
+        // Make the same message as V8.
+        var ch$1 = state.current();
+        if (ch$1 === 0x63 /* c */ || isOctalDigit(ch$1)) {
+          state.raise("Invalid class escape");
+        }
+        state.raise("Invalid escape");
       }
+      state.pos = start;
     }
-  }
-};
 
-// https://www.ecma-international.org/ecma-262/8.0/#prod-ClassAtom
-// https://www.ecma-international.org/ecma-262/8.0/#prod-ClassAtomNoDash
-pp$9.regexp_eatClassAtom = function(state) {
-  var start = state.pos;
-
-  if (state.eat(0x5C /* \ */)) {
-    if (this.regexp_eatClassEscape(state)) {
+    var ch = state.current();
+    if (ch !== 0x5D /* [ */) {
+      state.lastIntValue = ch;
+      state.advance();
       return true
     }
-    if (state.switchU) {
-      // Make the same message as V8.
-      var ch$1 = state.current();
-      if (ch$1 === 0x63 /* c */ || isOctalDigit(ch$1)) {
-        state.raise("Invalid class escape");
-      }
-      state.raise("Invalid escape");
+
+    return false
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ClassEscape
+  pp$8.regexp_eatClassEscape = function(state) {
+    var start = state.pos;
+
+    if (state.eat(0x62 /* b */)) {
+      state.lastIntValue = 0x08; /* <BS> */
+      return true
     }
-    state.pos = start;
-  }
 
-  var ch = state.current();
-  if (ch !== 0x5D /* [ */) {
-    state.lastIntValue = ch;
-    state.advance();
-    return true
-  }
+    if (state.switchU && state.eat(0x2D /* - */)) {
+      state.lastIntValue = 0x2D; /* - */
+      return true
+    }
 
-  return false
-};
+    if (!state.switchU && state.eat(0x63 /* c */)) {
+      if (this.regexp_eatClassControlLetter(state)) {
+        return true
+      }
+      state.pos = start;
+    }
 
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ClassEscape
-pp$9.regexp_eatClassEscape = function(state) {
-  var start = state.pos;
+    return (
+      this.regexp_eatCharacterClassEscape(state) ||
+      this.regexp_eatCharacterEscape(state)
+    )
+  };
 
-  if (state.eat(0x62 /* b */)) {
-    state.lastIntValue = 0x08; /* <BS> */
-    return true
-  }
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ClassControlLetter
+  pp$8.regexp_eatClassControlLetter = function(state) {
+    var ch = state.current();
+    if (isDecimalDigit(ch) || ch === 0x5F /* _ */) {
+      state.lastIntValue = ch % 0x20;
+      state.advance();
+      return true
+    }
+    return false
+  };
 
-  if (state.switchU && state.eat(0x2D /* - */)) {
-    state.lastIntValue = 0x2D; /* - */
-    return true
-  }
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-HexEscapeSequence
+  pp$8.regexp_eatHexEscapeSequence = function(state) {
+    var start = state.pos;
+    if (state.eat(0x78 /* x */)) {
+      if (this.regexp_eatFixedHexDigits(state, 2)) {
+        return true
+      }
+      if (state.switchU) {
+        state.raise("Invalid escape");
+      }
+      state.pos = start;
+    }
+    return false
+  };
 
-  if (!state.switchU && state.eat(0x63 /* c */)) {
-    if (this.regexp_eatClassControlLetter(state)) {
-      return true
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-DecimalDigits
+  pp$8.regexp_eatDecimalDigits = function(state) {
+    var start = state.pos;
+    var ch = 0;
+    state.lastIntValue = 0;
+    while (isDecimalDigit(ch = state.current())) {
+      state.lastIntValue = 10 * state.lastIntValue + (ch - 0x30 /* 0 */);
+      state.advance();
     }
-    state.pos = start;
+    return state.pos !== start
+  };
+  function isDecimalDigit(ch) {
+    return ch >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */
   }
 
-  return (
-    this.regexp_eatCharacterClassEscape(state) ||
-    this.regexp_eatCharacterEscape(state)
-  )
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ClassControlLetter
-pp$9.regexp_eatClassControlLetter = function(state) {
-  var ch = state.current();
-  if (isDecimalDigit(ch) || ch === 0x5F /* _ */) {
-    state.lastIntValue = ch % 0x20;
-    state.advance();
-    return true
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-HexEscapeSequence
-pp$9.regexp_eatHexEscapeSequence = function(state) {
-  var start = state.pos;
-  if (state.eat(0x78 /* x */)) {
-    if (this.regexp_eatFixedHexDigits(state, 2)) {
-      return true
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-HexDigits
+  pp$8.regexp_eatHexDigits = function(state) {
+    var start = state.pos;
+    var ch = 0;
+    state.lastIntValue = 0;
+    while (isHexDigit(ch = state.current())) {
+      state.lastIntValue = 16 * state.lastIntValue + hexToInt(ch);
+      state.advance();
     }
-    if (state.switchU) {
-      state.raise("Invalid escape");
+    return state.pos !== start
+  };
+  function isHexDigit(ch) {
+    return (
+      (ch >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */) ||
+      (ch >= 0x41 /* A */ && ch <= 0x46 /* F */) ||
+      (ch >= 0x61 /* a */ && ch <= 0x66 /* f */)
+    )
+  }
+  function hexToInt(ch) {
+    if (ch >= 0x41 /* A */ && ch <= 0x46 /* F */) {
+      return 10 + (ch - 0x41 /* A */)
     }
-    state.pos = start;
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-DecimalDigits
-pp$9.regexp_eatDecimalDigits = function(state) {
-  var start = state.pos;
-  var ch = 0;
-  state.lastIntValue = 0;
-  while (isDecimalDigit(ch = state.current())) {
-    state.lastIntValue = 10 * state.lastIntValue + (ch - 0x30 /* 0 */);
-    state.advance();
-  }
-  return state.pos !== start
-};
-function isDecimalDigit(ch) {
-  return ch >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */
-}
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-HexDigits
-pp$9.regexp_eatHexDigits = function(state) {
-  var start = state.pos;
-  var ch = 0;
-  state.lastIntValue = 0;
-  while (isHexDigit(ch = state.current())) {
-    state.lastIntValue = 16 * state.lastIntValue + hexToInt(ch);
-    state.advance();
-  }
-  return state.pos !== start
-};
-function isHexDigit(ch) {
-  return (
-    (ch >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */) ||
-    (ch >= 0x41 /* A */ && ch <= 0x46 /* F */) ||
-    (ch >= 0x61 /* a */ && ch <= 0x66 /* f */)
-  )
-}
-function hexToInt(ch) {
-  if (ch >= 0x41 /* A */ && ch <= 0x46 /* F */) {
-    return 10 + (ch - 0x41 /* A */)
-  }
-  if (ch >= 0x61 /* a */ && ch <= 0x66 /* f */) {
-    return 10 + (ch - 0x61 /* a */)
+    if (ch >= 0x61 /* a */ && ch <= 0x66 /* f */) {
+      return 10 + (ch - 0x61 /* a */)
+    }
+    return ch - 0x30 /* 0 */
   }
-  return ch - 0x30 /* 0 */
-}
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-LegacyOctalEscapeSequence
-// Allows only 0-377(octal) i.e. 0-255(decimal).
-pp$9.regexp_eatLegacyOctalEscapeSequence = function(state) {
-  if (this.regexp_eatOctalDigit(state)) {
-    var n1 = state.lastIntValue;
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-LegacyOctalEscapeSequence
+  // Allows only 0-377(octal) i.e. 0-255(decimal).
+  pp$8.regexp_eatLegacyOctalEscapeSequence = function(state) {
     if (this.regexp_eatOctalDigit(state)) {
-      var n2 = state.lastIntValue;
-      if (n1 <= 3 && this.regexp_eatOctalDigit(state)) {
-        state.lastIntValue = n1 * 64 + n2 * 8 + state.lastIntValue;
+      var n1 = state.lastIntValue;
+      if (this.regexp_eatOctalDigit(state)) {
+        var n2 = state.lastIntValue;
+        if (n1 <= 3 && this.regexp_eatOctalDigit(state)) {
+          state.lastIntValue = n1 * 64 + n2 * 8 + state.lastIntValue;
+        } else {
+          state.lastIntValue = n1 * 8 + n2;
+        }
       } else {
-        state.lastIntValue = n1 * 8 + n2;
+        state.lastIntValue = n1;
       }
-    } else {
-      state.lastIntValue = n1;
+      return true
     }
-    return true
-  }
-  return false
-};
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-OctalDigit
-pp$9.regexp_eatOctalDigit = function(state) {
-  var ch = state.current();
-  if (isOctalDigit(ch)) {
-    state.lastIntValue = ch - 0x30; /* 0 */
-    state.advance();
-    return true
-  }
-  state.lastIntValue = 0;
-  return false
-};
-function isOctalDigit(ch) {
-  return ch >= 0x30 /* 0 */ && ch <= 0x37 /* 7 */
-}
-
-// https://www.ecma-international.org/ecma-262/8.0/#prod-Hex4Digits
-// https://www.ecma-international.org/ecma-262/8.0/#prod-HexDigit
-// And HexDigit HexDigit in https://www.ecma-international.org/ecma-262/8.0/#prod-HexEscapeSequence
-pp$9.regexp_eatFixedHexDigits = function(state, length) {
-  var start = state.pos;
-  state.lastIntValue = 0;
-  for (var i = 0; i < length; ++i) {
+    return false
+  };
+
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-OctalDigit
+  pp$8.regexp_eatOctalDigit = function(state) {
     var ch = state.current();
-    if (!isHexDigit(ch)) {
-      state.pos = start;
-      return false
+    if (isOctalDigit(ch)) {
+      state.lastIntValue = ch - 0x30; /* 0 */
+      state.advance();
+      return true
     }
-    state.lastIntValue = 16 * state.lastIntValue + hexToInt(ch);
-    state.advance();
+    state.lastIntValue = 0;
+    return false
+  };
+  function isOctalDigit(ch) {
+    return ch >= 0x30 /* 0 */ && ch <= 0x37 /* 7 */
   }
-  return true
-};
-
-// Object type used to represent tokens. Note that normally, tokens
-// simply exist as properties on the parser object. This is only
-// used for the onToken callback and the external tokenizer.
-
-var Token = function Token(p) {
-  this.type = p.type;
-  this.value = p.value;
-  this.start = p.start;
-  this.end = p.end;
-  if (p.options.locations)
-    { this.loc = new SourceLocation(p, p.startLoc, p.endLoc); }
-  if (p.options.ranges)
-    { this.range = [p.start, p.end]; }
-};
-
-// ## Tokenizer
-
-var pp$8 = Parser.prototype;
-
-// Move to the next token
-
-pp$8.next = function() {
-  if (this.options.onToken)
-    { this.options.onToken(new Token(this)); }
-
-  this.lastTokEnd = this.end;
-  this.lastTokStart = this.start;
-  this.lastTokEndLoc = this.endLoc;
-  this.lastTokStartLoc = this.startLoc;
-  this.nextToken();
-};
-
-pp$8.getToken = function() {
-  this.next();
-  return new Token(this)
-};
-
-// If we're in an ES6 environment, make parsers iterable
-if (typeof Symbol !== "undefined")
-  { pp$8[Symbol.iterator] = function() {
-    var this$1 = this;
 
-    return {
-      next: function () {
-        var token = this$1.getToken();
-        return {
-          done: token.type === types.eof,
-          value: token
-        }
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-Hex4Digits
+  // https://www.ecma-international.org/ecma-262/8.0/#prod-HexDigit
+  // And HexDigit HexDigit in https://www.ecma-international.org/ecma-262/8.0/#prod-HexEscapeSequence
+  pp$8.regexp_eatFixedHexDigits = function(state, length) {
+    var start = state.pos;
+    state.lastIntValue = 0;
+    for (var i = 0; i < length; ++i) {
+      var ch = state.current();
+      if (!isHexDigit(ch)) {
+        state.pos = start;
+        return false
       }
+      state.lastIntValue = 16 * state.lastIntValue + hexToInt(ch);
+      state.advance();
     }
-  }; }
+    return true
+  };
+
+  // Object type used to represent tokens. Note that normally, tokens
+  // simply exist as properties on the parser object. This is only
+  // used for the onToken callback and the external tokenizer.
+
+  var Token = function Token(p) {
+    this.type = p.type;
+    this.value = p.value;
+    this.start = p.start;
+    this.end = p.end;
+    if (p.options.locations)
+      { this.loc = new SourceLocation(p, p.startLoc, p.endLoc); }
+    if (p.options.ranges)
+      { this.range = [p.start, p.end]; }
+  };
+
+  // ## Tokenizer
 
-// Toggle strict mode. Re-reads the next number or string to please
-// pedantic tests (`"use strict"; 010;` should fail).
+  var pp$9 = Parser.prototype;
 
-pp$8.curContext = function() {
-  return this.context[this.context.length - 1]
-};
+  // Move to the next token
 
-// Read a single token, updating the parser object's token-related
-// properties.
+  pp$9.next = function() {
+    if (this.options.onToken)
+      { this.options.onToken(new Token(this)); }
 
-pp$8.nextToken = function() {
-  var curContext = this.curContext();
-  if (!curContext || !curContext.preserveSpace) { this.skipSpace(); }
+    this.lastTokEnd = this.end;
+    this.lastTokStart = this.start;
+    this.lastTokEndLoc = this.endLoc;
+    this.lastTokStartLoc = this.startLoc;
+    this.nextToken();
+  };
 
-  this.start = this.pos;
-  if (this.options.locations) { this.startLoc = this.curPosition(); }
-  if (this.pos >= this.input.length) { return this.finishToken(types.eof) }
+  pp$9.getToken = function() {
+    this.next();
+    return new Token(this)
+  };
 
-  if (curContext.override) { return curContext.override(this) }
-  else { this.readToken(this.fullCharCodeAtPos()); }
-};
+  // If we're in an ES6 environment, make parsers iterable
+  if (typeof Symbol !== "undefined")
+    { pp$9[Symbol.iterator] = function() {
+      var this$1 = this;
+
+      return {
+        next: function () {
+          var token = this$1.getToken();
+          return {
+            done: token.type === types.eof,
+            value: token
+          }
+        }
+      }
+    }; }
 
-pp$8.readToken = function(code) {
-  // Identifier or keyword. '\uXXXX' sequences are allowed in
-  // identifiers, so '\' also dispatches to that.
-  if (isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */)
-    { return this.readWord() }
+  // Toggle strict mode. Re-reads the next number or string to please
+  // pedantic tests (`"use strict"; 010;` should fail).
 
-  return this.getTokenFromCode(code)
-};
+  pp$9.curContext = function() {
+    return this.context[this.context.length - 1]
+  };
 
-pp$8.fullCharCodeAtPos = function() {
-  var code = this.input.charCodeAt(this.pos);
-  if (code <= 0xd7ff || code >= 0xe000) { return code }
-  var next = this.input.charCodeAt(this.pos + 1);
-  return (code << 10) + next - 0x35fdc00
-};
+  // Read a single token, updating the parser object's token-related
+  // properties.
 
-pp$8.skipBlockComment = function() {
-  var this$1 = this;
+  pp$9.nextToken = function() {
+    var curContext = this.curContext();
+    if (!curContext || !curContext.preserveSpace) { this.skipSpace(); }
 
-  var startLoc = this.options.onComment && this.curPosition();
-  var start = this.pos, end = this.input.indexOf("*/", this.pos += 2);
-  if (end === -1) { this.raise(this.pos - 2, "Unterminated comment"); }
-  this.pos = end + 2;
-  if (this.options.locations) {
-    lineBreakG.lastIndex = start;
-    var match;
-    while ((match = lineBreakG.exec(this.input)) && match.index < this.pos) {
-      ++this$1.curLine;
-      this$1.lineStart = match.index + match[0].length;
-    }
-  }
-  if (this.options.onComment)
-    { this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos,
-                           startLoc, this.curPosition()); }
-};
-
-pp$8.skipLineComment = function(startSkip) {
-  var this$1 = this;
-
-  var start = this.pos;
-  var startLoc = this.options.onComment && this.curPosition();
-  var ch = this.input.charCodeAt(this.pos += startSkip);
-  while (this.pos < this.input.length && !isNewLine(ch)) {
-    ch = this$1.input.charCodeAt(++this$1.pos);
-  }
-  if (this.options.onComment)
-    { this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos,
-                           startLoc, this.curPosition()); }
-};
+    this.start = this.pos;
+    if (this.options.locations) { this.startLoc = this.curPosition(); }
+    if (this.pos >= this.input.length) { return this.finishToken(types.eof) }
 
-// Called at the start of the parse and after every token. Skips
-// whitespace and comments, and.
+    if (curContext.override) { return curContext.override(this) }
+    else { this.readToken(this.fullCharCodeAtPos()); }
+  };
 
-pp$8.skipSpace = function() {
-  var this$1 = this;
+  pp$9.readToken = function(code) {
+    // Identifier or keyword. '\uXXXX' sequences are allowed in
+    // identifiers, so '\' also dispatches to that.
+    if (isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */)
+      { return this.readWord() }
 
-  loop: while (this.pos < this.input.length) {
-    var ch = this$1.input.charCodeAt(this$1.pos);
-    switch (ch) {
-    case 32: case 160: // ' '
-      ++this$1.pos;
-      break
-    case 13:
-      if (this$1.input.charCodeAt(this$1.pos + 1) === 10) {
-        ++this$1.pos;
-      }
-    case 10: case 8232: case 8233:
-      ++this$1.pos;
-      if (this$1.options.locations) {
-        ++this$1.curLine;
-        this$1.lineStart = this$1.pos;
+    return this.getTokenFromCode(code)
+  };
+
+  pp$9.fullCharCodeAtPos = function() {
+    var code = this.input.charCodeAt(this.pos);
+    if (code <= 0xd7ff || code >= 0xe000) { return code }
+    var next = this.input.charCodeAt(this.pos + 1);
+    return (code << 10) + next - 0x35fdc00
+  };
+
+  pp$9.skipBlockComment = function() {
+    var startLoc = this.options.onComment && this.curPosition();
+    var start = this.pos, end = this.input.indexOf("*/", this.pos += 2);
+    if (end === -1) { this.raise(this.pos - 2, "Unterminated comment"); }
+    this.pos = end + 2;
+    if (this.options.locations) {
+      lineBreakG.lastIndex = start;
+      var match;
+      while ((match = lineBreakG.exec(this.input)) && match.index < this.pos) {
+        ++this.curLine;
+        this.lineStart = match.index + match[0].length;
       }
-      break
-    case 47: // '/'
-      switch (this$1.input.charCodeAt(this$1.pos + 1)) {
-      case 42: // '*'
-        this$1.skipBlockComment();
+    }
+    if (this.options.onComment)
+      { this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos,
+                             startLoc, this.curPosition()); }
+  };
+
+  pp$9.skipLineComment = function(startSkip) {
+    var start = this.pos;
+    var startLoc = this.options.onComment && this.curPosition();
+    var ch = this.input.charCodeAt(this.pos += startSkip);
+    while (this.pos < this.input.length && !isNewLine(ch)) {
+      ch = this.input.charCodeAt(++this.pos);
+    }
+    if (this.options.onComment)
+      { this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos,
+                             startLoc, this.curPosition()); }
+  };
+
+  // Called at the start of the parse and after every token. Skips
+  // whitespace and comments, and.
+
+  pp$9.skipSpace = function() {
+    loop: while (this.pos < this.input.length) {
+      var ch = this.input.charCodeAt(this.pos);
+      switch (ch) {
+      case 32: case 160: // ' '
+        ++this.pos;
+        break
+      case 13:
+        if (this.input.charCodeAt(this.pos + 1) === 10) {
+          ++this.pos;
+        }
+      case 10: case 8232: case 8233:
+        ++this.pos;
+        if (this.options.locations) {
+          ++this.curLine;
+          this.lineStart = this.pos;
+        }
         break
-      case 47:
-        this$1.skipLineComment(2);
+      case 47: // '/'
+        switch (this.input.charCodeAt(this.pos + 1)) {
+        case 42: // '*'
+          this.skipBlockComment();
+          break
+        case 47:
+          this.skipLineComment(2);
+          break
+        default:
+          break loop
+        }
         break
       default:
-        break loop
+        if (ch > 8 && ch < 14 || ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
+          ++this.pos;
+        } else {
+          break loop
+        }
       }
-      break
-    default:
-      if (ch > 8 && ch < 14 || ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
-        ++this$1.pos;
-      } else {
-        break loop
+    }
+  };
+
+  // Called at the end of every token. Sets `end`, `val`, and
+  // maintains `context` and `exprAllowed`, and skips the space after
+  // the token, so that the next one's `start` will point at the
+  // right position.
+
+  pp$9.finishToken = function(type, val) {
+    this.end = this.pos;
+    if (this.options.locations) { this.endLoc = this.curPosition(); }
+    var prevType = this.type;
+    this.type = type;
+    this.value = val;
+
+    this.updateContext(prevType);
+  };
+
+  // ### Token reading
+
+  // This is the function that is called to fetch the next token. It
+  // is somewhat obscure, because it works in character codes rather
+  // than characters, and because operator parsing has been inlined
+  // into it.
+  //
+  // All in the name of speed.
+  //
+  pp$9.readToken_dot = function() {
+    var next = this.input.charCodeAt(this.pos + 1);
+    if (next >= 48 && next <= 57) { return this.readNumber(true) }
+    var next2 = this.input.charCodeAt(this.pos + 2);
+    if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) { // 46 = dot '.'
+      this.pos += 3;
+      return this.finishToken(types.ellipsis)
+    } else {
+      ++this.pos;
+      return this.finishToken(types.dot)
+    }
+  };
+
+  pp$9.readToken_slash = function() { // '/'
+    var next = this.input.charCodeAt(this.pos + 1);
+    if (this.exprAllowed) { ++this.pos; return this.readRegexp() }
+    if (next === 61) { return this.finishOp(types.assign, 2) }
+    return this.finishOp(types.slash, 1)
+  };
+
+  pp$9.readToken_mult_modulo_exp = function(code) { // '%*'
+    var next = this.input.charCodeAt(this.pos + 1);
+    var size = 1;
+    var tokentype = code === 42 ? types.star : types.modulo;
+
+    // exponentiation operator ** and **=
+    if (this.options.ecmaVersion >= 7 && code === 42 && next === 42) {
+      ++size;
+      tokentype = types.starstar;
+      next = this.input.charCodeAt(this.pos + 2);
+    }
+
+    if (next === 61) { return this.finishOp(types.assign, size + 1) }
+    return this.finishOp(tokentype, size)
+  };
+
+  pp$9.readToken_pipe_amp = function(code) { // '|&'
+    var next = this.input.charCodeAt(this.pos + 1);
+    if (next === code) { return this.finishOp(code === 124 ? types.logicalOR : types.logicalAND, 2) }
+    if (next === 61) { return this.finishOp(types.assign, 2) }
+    return this.finishOp(code === 124 ? types.bitwiseOR : types.bitwiseAND, 1)
+  };
+
+  pp$9.readToken_caret = function() { // '^'
+    var next = this.input.charCodeAt(this.pos + 1);
+    if (next === 61) { return this.finishOp(types.assign, 2) }
+    return this.finishOp(types.bitwiseXOR, 1)
+  };
+
+  pp$9.readToken_plus_min = function(code) { // '+-'
+    var next = this.input.charCodeAt(this.pos + 1);
+    if (next === code) {
+      if (next === 45 && !this.inModule && this.input.charCodeAt(this.pos + 2) === 62 &&
+          (this.lastTokEnd === 0 || lineBreak.test(this.input.slice(this.lastTokEnd, this.pos)))) {
+        // A `-->` line comment
+        this.skipLineComment(3);
+        this.skipSpace();
+        return this.nextToken()
       }
+      return this.finishOp(types.incDec, 2)
     }
-  }
-};
-
-// Called at the end of every token. Sets `end`, `val`, and
-// maintains `context` and `exprAllowed`, and skips the space after
-// the token, so that the next one's `start` will point at the
-// right position.
-
-pp$8.finishToken = function(type, val) {
-  this.end = this.pos;
-  if (this.options.locations) { this.endLoc = this.curPosition(); }
-  var prevType = this.type;
-  this.type = type;
-  this.value = val;
-
-  this.updateContext(prevType);
-};
-
-// ### Token reading
-
-// This is the function that is called to fetch the next token. It
-// is somewhat obscure, because it works in character codes rather
-// than characters, and because operator parsing has been inlined
-// into it.
-//
-// All in the name of speed.
-//
-pp$8.readToken_dot = function() {
-  var next = this.input.charCodeAt(this.pos + 1);
-  if (next >= 48 && next <= 57) { return this.readNumber(true) }
-  var next2 = this.input.charCodeAt(this.pos + 2);
-  if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) { // 46 = dot '.'
-    this.pos += 3;
-    return this.finishToken(types.ellipsis)
-  } else {
-    ++this.pos;
-    return this.finishToken(types.dot)
-  }
-};
-
-pp$8.readToken_slash = function() { // '/'
-  var next = this.input.charCodeAt(this.pos + 1);
-  if (this.exprAllowed) { ++this.pos; return this.readRegexp() }
-  if (next === 61) { return this.finishOp(types.assign, 2) }
-  return this.finishOp(types.slash, 1)
-};
-
-pp$8.readToken_mult_modulo_exp = function(code) { // '%*'
-  var next = this.input.charCodeAt(this.pos + 1);
-  var size = 1;
-  var tokentype = code === 42 ? types.star : types.modulo;
-
-  // exponentiation operator ** and **=
-  if (this.options.ecmaVersion >= 7 && code === 42 && next === 42) {
-    ++size;
-    tokentype = types.starstar;
-    next = this.input.charCodeAt(this.pos + 2);
-  }
+    if (next === 61) { return this.finishOp(types.assign, 2) }
+    return this.finishOp(types.plusMin, 1)
+  };
 
-  if (next === 61) { return this.finishOp(types.assign, size + 1) }
-  return this.finishOp(tokentype, size)
-};
-
-pp$8.readToken_pipe_amp = function(code) { // '|&'
-  var next = this.input.charCodeAt(this.pos + 1);
-  if (next === code) { return this.finishOp(code === 124 ? types.logicalOR : types.logicalAND, 2) }
-  if (next === 61) { return this.finishOp(types.assign, 2) }
-  return this.finishOp(code === 124 ? types.bitwiseOR : types.bitwiseAND, 1)
-};
-
-pp$8.readToken_caret = function() { // '^'
-  var next = this.input.charCodeAt(this.pos + 1);
-  if (next === 61) { return this.finishOp(types.assign, 2) }
-  return this.finishOp(types.bitwiseXOR, 1)
-};
-
-pp$8.readToken_plus_min = function(code) { // '+-'
-  var next = this.input.charCodeAt(this.pos + 1);
-  if (next === code) {
-    if (next === 45 && !this.inModule && this.input.charCodeAt(this.pos + 2) === 62 &&
-        (this.lastTokEnd === 0 || lineBreak.test(this.input.slice(this.lastTokEnd, this.pos)))) {
-      // A `-->` line comment
-      this.skipLineComment(3);
+  pp$9.readToken_lt_gt = function(code) { // '<>'
+    var next = this.input.charCodeAt(this.pos + 1);
+    var size = 1;
+    if (next === code) {
+      size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2;
+      if (this.input.charCodeAt(this.pos + size) === 61) { return this.finishOp(types.assign, size + 1) }
+      return this.finishOp(types.bitShift, size)
+    }
+    if (next === 33 && code === 60 && !this.inModule && this.input.charCodeAt(this.pos + 2) === 45 &&
+        this.input.charCodeAt(this.pos + 3) === 45) {
+      // `<!--`, an XML-style comment that should be interpreted as a line comment
+      this.skipLineComment(4);
       this.skipSpace();
       return this.nextToken()
     }
-    return this.finishOp(types.incDec, 2)
-  }
-  if (next === 61) { return this.finishOp(types.assign, 2) }
-  return this.finishOp(types.plusMin, 1)
-};
-
-pp$8.readToken_lt_gt = function(code) { // '<>'
-  var next = this.input.charCodeAt(this.pos + 1);
-  var size = 1;
-  if (next === code) {
-    size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2;
-    if (this.input.charCodeAt(this.pos + size) === 61) { return this.finishOp(types.assign, size + 1) }
-    return this.finishOp(types.bitShift, size)
-  }
-  if (next === 33 && code === 60 && !this.inModule && this.input.charCodeAt(this.pos + 2) === 45 &&
-      this.input.charCodeAt(this.pos + 3) === 45) {
-    // `<!--`, an XML-style comment that should be interpreted as a line comment
-    this.skipLineComment(4);
-    this.skipSpace();
-    return this.nextToken()
-  }
-  if (next === 61) { size = 2; }
-  return this.finishOp(types.relational, size)
-};
-
-pp$8.readToken_eq_excl = function(code) { // '=!'
-  var next = this.input.charCodeAt(this.pos + 1);
-  if (next === 61) { return this.finishOp(types.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2) }
-  if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) { // '=>'
-    this.pos += 2;
-    return this.finishToken(types.arrow)
-  }
-  return this.finishOp(code === 61 ? types.eq : types.prefix, 1)
-};
-
-pp$8.getTokenFromCode = function(code) {
-  switch (code) {
-  // The interpretation of a dot depends on whether it is followed
-  // by a digit or another two dots.
-  case 46: // '.'
-    return this.readToken_dot()
-
-  // Punctuation tokens.
-  case 40: ++this.pos; return this.finishToken(types.parenL)
-  case 41: ++this.pos; return this.finishToken(types.parenR)
-  case 59: ++this.pos; return this.finishToken(types.semi)
-  case 44: ++this.pos; return this.finishToken(types.comma)
-  case 91: ++this.pos; return this.finishToken(types.bracketL)
-  case 93: ++this.pos; return this.finishToken(types.bracketR)
-  case 123: ++this.pos; return this.finishToken(types.braceL)
-  case 125: ++this.pos; return this.finishToken(types.braceR)
-  case 58: ++this.pos; return this.finishToken(types.colon)
-  case 63: ++this.pos; return this.finishToken(types.question)
-
-  case 96: // '`'
-    if (this.options.ecmaVersion < 6) { break }
-    ++this.pos;
-    return this.finishToken(types.backQuote)
+    if (next === 61) { size = 2; }
+    return this.finishOp(types.relational, size)
+  };
 
-  case 48: // '0'
+  pp$9.readToken_eq_excl = function(code) { // '=!'
     var next = this.input.charCodeAt(this.pos + 1);
-    if (next === 120 || next === 88) { return this.readRadixNumber(16) } // '0x', '0X' - hex number
-    if (this.options.ecmaVersion >= 6) {
-      if (next === 111 || next === 79) { return this.readRadixNumber(8) } // '0o', '0O' - octal number
-      if (next === 98 || next === 66) { return this.readRadixNumber(2) } // '0b', '0B' - binary number
+    if (next === 61) { return this.finishOp(types.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2) }
+    if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) { // '=>'
+      this.pos += 2;
+      return this.finishToken(types.arrow)
     }
+    return this.finishOp(code === 61 ? types.eq : types.prefix, 1)
+  };
+
+  pp$9.getTokenFromCode = function(code) {
+    switch (code) {
+    // The interpretation of a dot depends on whether it is followed
+    // by a digit or another two dots.
+    case 46: // '.'
+      return this.readToken_dot()
+
+    // Punctuation tokens.
+    case 40: ++this.pos; return this.finishToken(types.parenL)
+    case 41: ++this.pos; return this.finishToken(types.parenR)
+    case 59: ++this.pos; return this.finishToken(types.semi)
+    case 44: ++this.pos; return this.finishToken(types.comma)
+    case 91: ++this.pos; return this.finishToken(types.bracketL)
+    case 93: ++this.pos; return this.finishToken(types.bracketR)
+    case 123: ++this.pos; return this.finishToken(types.braceL)
+    case 125: ++this.pos; return this.finishToken(types.braceR)
+    case 58: ++this.pos; return this.finishToken(types.colon)
+    case 63: ++this.pos; return this.finishToken(types.question)
+
+    case 96: // '`'
+      if (this.options.ecmaVersion < 6) { break }
+      ++this.pos;
+      return this.finishToken(types.backQuote)
+
+    case 48: // '0'
+      var next = this.input.charCodeAt(this.pos + 1);
+      if (next === 120 || next === 88) { return this.readRadixNumber(16) } // '0x', '0X' - hex number
+      if (this.options.ecmaVersion >= 6) {
+        if (next === 111 || next === 79) { return this.readRadixNumber(8) } // '0o', '0O' - octal number
+        if (next === 98 || next === 66) { return this.readRadixNumber(2) } // '0b', '0B' - binary number
+      }
 
-  // Anything else beginning with a digit is an integer, octal
-  // number, or float.
-  case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
-    return this.readNumber(false)
+    // Anything else beginning with a digit is an integer, octal
+    // number, or float.
+    case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
+      return this.readNumber(false)
 
-  // Quotes produce strings.
-  case 34: case 39: // '"', "'"
-    return this.readString(code)
+    // Quotes produce strings.
+    case 34: case 39: // '"', "'"
+      return this.readString(code)
 
-  // Operators are parsed inline in tiny state machines. '=' (61) is
-  // often referred to. `finishOp` simply skips the amount of
-  // characters it is given as second argument, and returns a token
-  // of the type given by its first argument.
+    // Operators are parsed inline in tiny state machines. '=' (61) is
+    // often referred to. `finishOp` simply skips the amount of
+    // characters it is given as second argument, and returns a token
+    // of the type given by its first argument.
 
-  case 47: // '/'
-    return this.readToken_slash()
+    case 47: // '/'
+      return this.readToken_slash()
 
-  case 37: case 42: // '%*'
-    return this.readToken_mult_modulo_exp(code)
+    case 37: case 42: // '%*'
+      return this.readToken_mult_modulo_exp(code)
 
-  case 124: case 38: // '|&'
-    return this.readToken_pipe_amp(code)
+    case 124: case 38: // '|&'
+      return this.readToken_pipe_amp(code)
 
-  case 94: // '^'
-    return this.readToken_caret()
+    case 94: // '^'
+      return this.readToken_caret()
 
-  case 43: case 45: // '+-'
-    return this.readToken_plus_min(code)
+    case 43: case 45: // '+-'
+      return this.readToken_plus_min(code)
 
-  case 60: case 62: // '<>'
-    return this.readToken_lt_gt(code)
+    case 60: case 62: // '<>'
+      return this.readToken_lt_gt(code)
 
-  case 61: case 33: // '=!'
-    return this.readToken_eq_excl(code)
+    case 61: case 33: // '=!'
+      return this.readToken_eq_excl(code)
 
-  case 126: // '~'
-    return this.finishOp(types.prefix, 1)
-  }
+    case 126: // '~'
+      return this.finishOp(types.prefix, 1)
+    }
 
-  this.raise(this.pos, "Unexpected character '" + codePointToString(code) + "'");
-};
-
-pp$8.finishOp = function(type, size) {
-  var str = this.input.slice(this.pos, this.pos + size);
-  this.pos += size;
-  return this.finishToken(type, str)
-};
-
-pp$8.readRegexp = function() {
-  var this$1 = this;
-
-  var escaped, inClass, start = this.pos;
-  for (;;) {
-    if (this$1.pos >= this$1.input.length) { this$1.raise(start, "Unterminated regular expression"); }
-    var ch = this$1.input.charAt(this$1.pos);
-    if (lineBreak.test(ch)) { this$1.raise(start, "Unterminated regular expression"); }
-    if (!escaped) {
-      if (ch === "[") { inClass = true; }
-      else if (ch === "]" && inClass) { inClass = false; }
-      else if (ch === "/" && !inClass) { break }
-      escaped = ch === "\\";
-    } else { escaped = false; }
-    ++this$1.pos;
-  }
-  var pattern = this.input.slice(start, this.pos);
-  ++this.pos;
-  var flagsStart = this.pos;
-  var flags = this.readWord1();
-  if (this.containsEsc) { this.unexpected(flagsStart); }
-
-  // Validate pattern
-  var state = this.regexpState || (this.regexpState = new RegExpValidationState(this));
-  state.reset(start, pattern, flags);
-  this.validateRegExpFlags(state);
-  this.validateRegExpPattern(state);
-
-  // Create Literal#value property value.
-  var value = null;
-  try {
-    value = new RegExp(pattern, flags);
-  } catch (e) {
-    // ESTree requires null if it failed to instantiate RegExp object.
-    // https://github.com/estree/estree/blob/a27003adf4fd7bfad44de9cef372a2eacd527b1c/es5.md#regexpliteral
-  }
+    this.raise(this.pos, "Unexpected character '" + codePointToString$1(code) + "'");
+  };
 
-  return this.finishToken(types.regexp, {pattern: pattern, flags: flags, value: value})
-};
-
-// Read an integer in the given radix. Return null if zero digits
-// were read, the integer value otherwise. When `len` is given, this
-// will return `null` unless the integer has exactly `len` digits.
-
-pp$8.readInt = function(radix, len) {
-  var this$1 = this;
-
-  var start = this.pos, total = 0;
-  for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {
-    var code = this$1.input.charCodeAt(this$1.pos), val = (void 0);
-    if (code >= 97) { val = code - 97 + 10; } // a
-    else if (code >= 65) { val = code - 65 + 10; } // A
-    else if (code >= 48 && code <= 57) { val = code - 48; } // 0-9
-    else { val = Infinity; }
-    if (val >= radix) { break }
-    ++this$1.pos;
-    total = total * radix + val;
-  }
-  if (this.pos === start || len != null && this.pos - start !== len) { return null }
-
-  return total
-};
-
-pp$8.readRadixNumber = function(radix) {
-  this.pos += 2; // 0x
-  var val = this.readInt(radix);
-  if (val == null) { this.raise(this.start + 2, "Expected number in radix " + radix); }
-  if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
-  return this.finishToken(types.num, val)
-};
-
-// Read an integer, octal integer, or floating-point number.
-
-pp$8.readNumber = function(startsWithDot) {
-  var start = this.pos;
-  if (!startsWithDot && this.readInt(10) === null) { this.raise(start, "Invalid number"); }
-  var octal = this.pos - start >= 2 && this.input.charCodeAt(start) === 48;
-  if (octal && this.strict) { this.raise(start, "Invalid number"); }
-  if (octal && /[89]/.test(this.input.slice(start, this.pos))) { octal = false; }
-  var next = this.input.charCodeAt(this.pos);
-  if (next === 46 && !octal) { // '.'
+  pp$9.finishOp = function(type, size) {
+    var str = this.input.slice(this.pos, this.pos + size);
+    this.pos += size;
+    return this.finishToken(type, str)
+  };
+
+  pp$9.readRegexp = function() {
+    var escaped, inClass, start = this.pos;
+    for (;;) {
+      if (this.pos >= this.input.length) { this.raise(start, "Unterminated regular expression"); }
+      var ch = this.input.charAt(this.pos);
+      if (lineBreak.test(ch)) { this.raise(start, "Unterminated regular expression"); }
+      if (!escaped) {
+        if (ch === "[") { inClass = true; }
+        else if (ch === "]" && inClass) { inClass = false; }
+        else if (ch === "/" && !inClass) { break }
+        escaped = ch === "\\";
+      } else { escaped = false; }
+      ++this.pos;
+    }
+    var pattern = this.input.slice(start, this.pos);
     ++this.pos;
-    this.readInt(10);
-    next = this.input.charCodeAt(this.pos);
-  }
-  if ((next === 69 || next === 101) && !octal) { // 'eE'
-    next = this.input.charCodeAt(++this.pos);
-    if (next === 43 || next === 45) { ++this.pos; } // '+-'
-    if (this.readInt(10) === null) { this.raise(start, "Invalid number"); }
-  }
-  if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
+    var flagsStart = this.pos;
+    var flags = this.readWord1();
+    if (this.containsEsc) { this.unexpected(flagsStart); }
+
+    // Validate pattern
+    var state = this.regexpState || (this.regexpState = new RegExpValidationState(this));
+    state.reset(start, pattern, flags);
+    this.validateRegExpFlags(state);
+    this.validateRegExpPattern(state);
+
+    // Create Literal#value property value.
+    var value = null;
+    try {
+      value = new RegExp(pattern, flags);
+    } catch (e) {
+      // ESTree requires null if it failed to instantiate RegExp object.
+      // https://github.com/estree/estree/blob/a27003adf4fd7bfad44de9cef372a2eacd527b1c/es5.md#regexpliteral
+    }
+
+    return this.finishToken(types.regexp, {pattern: pattern, flags: flags, value: value})
+  };
 
-  var str = this.input.slice(start, this.pos);
-  var val = octal ? parseInt(str, 8) : parseFloat(str);
-  return this.finishToken(types.num, val)
-};
+  // Read an integer in the given radix. Return null if zero digits
+  // were read, the integer value otherwise. When `len` is given, this
+  // will return `null` unless the integer has exactly `len` digits.
+
+  pp$9.readInt = function(radix, len) {
+    var start = this.pos, total = 0;
+    for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {
+      var code = this.input.charCodeAt(this.pos), val = (void 0);
+      if (code >= 97) { val = code - 97 + 10; } // a
+      else if (code >= 65) { val = code - 65 + 10; } // A
+      else if (code >= 48 && code <= 57) { val = code - 48; } // 0-9
+      else { val = Infinity; }
+      if (val >= radix) { break }
+      ++this.pos;
+      total = total * radix + val;
+    }
+    if (this.pos === start || len != null && this.pos - start !== len) { return null }
 
-// Read a string value, interpreting backslash-escapes.
+    return total
+  };
 
-pp$8.readCodePoint = function() {
-  var ch = this.input.charCodeAt(this.pos), code;
+  pp$9.readRadixNumber = function(radix) {
+    var start = this.pos;
+    this.pos += 2; // 0x
+    var val = this.readInt(radix);
+    if (val == null) { this.raise(this.start + 2, "Expected number in radix " + radix); }
+    if (this.options.ecmaVersion >= 11 && this.input.charCodeAt(this.pos) === 110) {
+      val = typeof BigInt !== "undefined" ? BigInt(this.input.slice(start, this.pos)) : null;
+      ++this.pos;
+    } else if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
+    return this.finishToken(types.num, val)
+  };
 
-  if (ch === 123) { // '{'
-    if (this.options.ecmaVersion < 6) { this.unexpected(); }
-    var codePos = ++this.pos;
-    code = this.readHexChar(this.input.indexOf("}", this.pos) - this.pos);
-    ++this.pos;
-    if (code > 0x10FFFF) { this.invalidStringToken(codePos, "Code point out of bounds"); }
-  } else {
-    code = this.readHexChar(4);
-  }
-  return code
-};
-
-function codePointToString(code) {
-  // UTF-16 Decoding
-  if (code <= 0xFFFF) { return String.fromCharCode(code) }
-  code -= 0x10000;
-  return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00)
-}
-
-pp$8.readString = function(quote) {
-  var this$1 = this;
-
-  var out = "", chunkStart = ++this.pos;
-  for (;;) {
-    if (this$1.pos >= this$1.input.length) { this$1.raise(this$1.start, "Unterminated string constant"); }
-    var ch = this$1.input.charCodeAt(this$1.pos);
-    if (ch === quote) { break }
-    if (ch === 92) { // '\'
-      out += this$1.input.slice(chunkStart, this$1.pos);
-      out += this$1.readEscapedChar(false);
-      chunkStart = this$1.pos;
-    } else {
-      if (isNewLine(ch, this$1.options.ecmaVersion >= 10)) { this$1.raise(this$1.start, "Unterminated string constant"); }
-      ++this$1.pos;
+  // Read an integer, octal integer, or floating-point number.
+
+  pp$9.readNumber = function(startsWithDot) {
+    var start = this.pos;
+    if (!startsWithDot && this.readInt(10) === null) { this.raise(start, "Invalid number"); }
+    var octal = this.pos - start >= 2 && this.input.charCodeAt(start) === 48;
+    if (octal && this.strict) { this.raise(start, "Invalid number"); }
+    if (octal && /[89]/.test(this.input.slice(start, this.pos))) { octal = false; }
+    var next = this.input.charCodeAt(this.pos);
+    if (!octal && !startsWithDot && this.options.ecmaVersion >= 11 && next === 110) {
+      var str$1 = this.input.slice(start, this.pos);
+      var val$1 = typeof BigInt !== "undefined" ? BigInt(str$1) : null;
+      ++this.pos;
+      if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
+      return this.finishToken(types.num, val$1)
     }
-  }
-  out += this.input.slice(chunkStart, this.pos++);
-  return this.finishToken(types.string, out)
-};
+    if (next === 46 && !octal) { // '.'
+      ++this.pos;
+      this.readInt(10);
+      next = this.input.charCodeAt(this.pos);
+    }
+    if ((next === 69 || next === 101) && !octal) { // 'eE'
+      next = this.input.charCodeAt(++this.pos);
+      if (next === 43 || next === 45) { ++this.pos; } // '+-'
+      if (this.readInt(10) === null) { this.raise(start, "Invalid number"); }
+    }
+    if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
 
-// Reads template string tokens.
+    var str = this.input.slice(start, this.pos);
+    var val = octal ? parseInt(str, 8) : parseFloat(str);
+    return this.finishToken(types.num, val)
+  };
+
+  // Read a string value, interpreting backslash-escapes.
 
-var INVALID_TEMPLATE_ESCAPE_ERROR = {};
+  pp$9.readCodePoint = function() {
+    var ch = this.input.charCodeAt(this.pos), code;
 
-pp$8.tryReadTemplateToken = function() {
-  this.inTemplateElement = true;
-  try {
-    this.readTmplToken();
-  } catch (err) {
-    if (err === INVALID_TEMPLATE_ESCAPE_ERROR) {
-      this.readInvalidTemplateToken();
+    if (ch === 123) { // '{'
+      if (this.options.ecmaVersion < 6) { this.unexpected(); }
+      var codePos = ++this.pos;
+      code = this.readHexChar(this.input.indexOf("}", this.pos) - this.pos);
+      ++this.pos;
+      if (code > 0x10FFFF) { this.invalidStringToken(codePos, "Code point out of bounds"); }
     } else {
-      throw err
+      code = this.readHexChar(4);
     }
-  }
+    return code
+  };
+
+  function codePointToString$1(code) {
+    // UTF-16 Decoding
+    if (code <= 0xFFFF) { return String.fromCharCode(code) }
+    code -= 0x10000;
+    return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00)
+  }
+
+  pp$9.readString = function(quote) {
+    var out = "", chunkStart = ++this.pos;
+    for (;;) {
+      if (this.pos >= this.input.length) { this.raise(this.start, "Unterminated string constant"); }
+      var ch = this.input.charCodeAt(this.pos);
+      if (ch === quote) { break }
+      if (ch === 92) { // '\'
+        out += this.input.slice(chunkStart, this.pos);
+        out += this.readEscapedChar(false);
+        chunkStart = this.pos;
+      } else {
+        if (isNewLine(ch, this.options.ecmaVersion >= 10)) { this.raise(this.start, "Unterminated string constant"); }
+        ++this.pos;
+      }
+    }
+    out += this.input.slice(chunkStart, this.pos++);
+    return this.finishToken(types.string, out)
+  };
 
-  this.inTemplateElement = false;
-};
+  // Reads template string tokens.
 
-pp$8.invalidStringToken = function(position, message) {
-  if (this.inTemplateElement && this.options.ecmaVersion >= 9) {
-    throw INVALID_TEMPLATE_ESCAPE_ERROR
-  } else {
-    this.raise(position, message);
-  }
-};
-
-pp$8.readTmplToken = function() {
-  var this$1 = this;
-
-  var out = "", chunkStart = this.pos;
-  for (;;) {
-    if (this$1.pos >= this$1.input.length) { this$1.raise(this$1.start, "Unterminated template"); }
-    var ch = this$1.input.charCodeAt(this$1.pos);
-    if (ch === 96 || ch === 36 && this$1.input.charCodeAt(this$1.pos + 1) === 123) { // '`', '${'
-      if (this$1.pos === this$1.start && (this$1.type === types.template || this$1.type === types.invalidTemplate)) {
-        if (ch === 36) {
-          this$1.pos += 2;
-          return this$1.finishToken(types.dollarBraceL)
-        } else {
-          ++this$1.pos;
-          return this$1.finishToken(types.backQuote)
-        }
+  var INVALID_TEMPLATE_ESCAPE_ERROR = {};
+
+  pp$9.tryReadTemplateToken = function() {
+    this.inTemplateElement = true;
+    try {
+      this.readTmplToken();
+    } catch (err) {
+      if (err === INVALID_TEMPLATE_ESCAPE_ERROR) {
+        this.readInvalidTemplateToken();
+      } else {
+        throw err
       }
-      out += this$1.input.slice(chunkStart, this$1.pos);
-      return this$1.finishToken(types.template, out)
-    }
-    if (ch === 92) { // '\'
-      out += this$1.input.slice(chunkStart, this$1.pos);
-      out += this$1.readEscapedChar(true);
-      chunkStart = this$1.pos;
-    } else if (isNewLine(ch)) {
-      out += this$1.input.slice(chunkStart, this$1.pos);
-      ++this$1.pos;
-      switch (ch) {
-      case 13:
-        if (this$1.input.charCodeAt(this$1.pos) === 10) { ++this$1.pos; }
-      case 10:
-        out += "\n";
-        break
-      default:
-        out += String.fromCharCode(ch);
-        break
+    }
+
+    this.inTemplateElement = false;
+  };
+
+  pp$9.invalidStringToken = function(position, message) {
+    if (this.inTemplateElement && this.options.ecmaVersion >= 9) {
+      throw INVALID_TEMPLATE_ESCAPE_ERROR
+    } else {
+      this.raise(position, message);
+    }
+  };
+
+  pp$9.readTmplToken = function() {
+    var out = "", chunkStart = this.pos;
+    for (;;) {
+      if (this.pos >= this.input.length) { this.raise(this.start, "Unterminated template"); }
+      var ch = this.input.charCodeAt(this.pos);
+      if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) { // '`', '${'
+        if (this.pos === this.start && (this.type === types.template || this.type === types.invalidTemplate)) {
+          if (ch === 36) {
+            this.pos += 2;
+            return this.finishToken(types.dollarBraceL)
+          } else {
+            ++this.pos;
+            return this.finishToken(types.backQuote)
+          }
+        }
+        out += this.input.slice(chunkStart, this.pos);
+        return this.finishToken(types.template, out)
       }
-      if (this$1.options.locations) {
-        ++this$1.curLine;
-        this$1.lineStart = this$1.pos;
+      if (ch === 92) { // '\'
+        out += this.input.slice(chunkStart, this.pos);
+        out += this.readEscapedChar(true);
+        chunkStart = this.pos;
+      } else if (isNewLine(ch)) {
+        out += this.input.slice(chunkStart, this.pos);
+        ++this.pos;
+        switch (ch) {
+        case 13:
+          if (this.input.charCodeAt(this.pos) === 10) { ++this.pos; }
+        case 10:
+          out += "\n";
+          break
+        default:
+          out += String.fromCharCode(ch);
+          break
+        }
+        if (this.options.locations) {
+          ++this.curLine;
+          this.lineStart = this.pos;
+        }
+        chunkStart = this.pos;
+      } else {
+        ++this.pos;
       }
-      chunkStart = this$1.pos;
-    } else {
-      ++this$1.pos;
     }
-  }
-};
+  };
+
+  // Reads a template token to search for the end, without validating any escape sequences
+  pp$9.readInvalidTemplateToken = function() {
+    for (; this.pos < this.input.length; this.pos++) {
+      switch (this.input[this.pos]) {
+      case "\\":
+        ++this.pos;
+        break
 
-// Reads a template token to search for the end, without validating any escape sequences
-pp$8.readInvalidTemplateToken = function() {
-  var this$1 = this;
+      case "$":
+        if (this.input[this.pos + 1] !== "{") {
+          break
+        }
+      // falls through
 
-  for (; this.pos < this.input.length; this.pos++) {
-    switch (this$1.input[this$1.pos]) {
-    case "\\":
-      ++this$1.pos;
-      break
+      case "`":
+        return this.finishToken(types.invalidTemplate, this.input.slice(this.start, this.pos))
 
-    case "$":
-      if (this$1.input[this$1.pos + 1] !== "{") {
-        break
+      // no default
       }
-    // falls through
+    }
+    this.raise(this.start, "Unterminated template");
+  };
 
-    case "`":
-      return this$1.finishToken(types.invalidTemplate, this$1.input.slice(this$1.start, this$1.pos))
+  // Used to read escaped characters
 
-    // no default
-    }
-  }
-  this.raise(this.start, "Unterminated template");
-};
-
-// Used to read escaped characters
-
-pp$8.readEscapedChar = function(inTemplate) {
-  var ch = this.input.charCodeAt(++this.pos);
-  ++this.pos;
-  switch (ch) {
-  case 110: return "\n" // 'n' -> '\n'
-  case 114: return "\r" // 'r' -> '\r'
-  case 120: return String.fromCharCode(this.readHexChar(2)) // 'x'
-  case 117: return codePointToString(this.readCodePoint()) // 'u'
-  case 116: return "\t" // 't' -> '\t'
-  case 98: return "\b" // 'b' -> '\b'
-  case 118: return "\u000b" // 'v' -> '\u000b'
-  case 102: return "\f" // 'f' -> '\f'
-  case 13: if (this.input.charCodeAt(this.pos) === 10) { ++this.pos; } // '\r\n'
-  case 10: // ' \n'
-    if (this.options.locations) { this.lineStart = this.pos; ++this.curLine; }
-    return ""
-  default:
-    if (ch >= 48 && ch <= 55) {
-      var octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0];
-      var octal = parseInt(octalStr, 8);
-      if (octal > 255) {
-        octalStr = octalStr.slice(0, -1);
-        octal = parseInt(octalStr, 8);
+  pp$9.readEscapedChar = function(inTemplate) {
+    var ch = this.input.charCodeAt(++this.pos);
+    ++this.pos;
+    switch (ch) {
+    case 110: return "\n" // 'n' -> '\n'
+    case 114: return "\r" // 'r' -> '\r'
+    case 120: return String.fromCharCode(this.readHexChar(2)) // 'x'
+    case 117: return codePointToString$1(this.readCodePoint()) // 'u'
+    case 116: return "\t" // 't' -> '\t'
+    case 98: return "\b" // 'b' -> '\b'
+    case 118: return "\u000b" // 'v' -> '\u000b'
+    case 102: return "\f" // 'f' -> '\f'
+    case 13: if (this.input.charCodeAt(this.pos) === 10) { ++this.pos; } // '\r\n'
+    case 10: // ' \n'
+      if (this.options.locations) { this.lineStart = this.pos; ++this.curLine; }
+      return ""
+    default:
+      if (ch >= 48 && ch <= 55) {
+        var octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0];
+        var octal = parseInt(octalStr, 8);
+        if (octal > 255) {
+          octalStr = octalStr.slice(0, -1);
+          octal = parseInt(octalStr, 8);
+        }
+        this.pos += octalStr.length - 1;
+        ch = this.input.charCodeAt(this.pos);
+        if ((octalStr !== "0" || ch === 56 || ch === 57) && (this.strict || inTemplate)) {
+          this.invalidStringToken(
+            this.pos - 1 - octalStr.length,
+            inTemplate
+              ? "Octal literal in template string"
+              : "Octal literal in strict mode"
+          );
+        }
+        return String.fromCharCode(octal)
       }
-      this.pos += octalStr.length - 1;
-      ch = this.input.charCodeAt(this.pos);
-      if ((octalStr !== "0" || ch === 56 || ch === 57) && (this.strict || inTemplate)) {
-        this.invalidStringToken(
-          this.pos - 1 - octalStr.length,
-          inTemplate
-            ? "Octal literal in template string"
-            : "Octal literal in strict mode"
-        );
+      if (isNewLine(ch)) {
+        // Unicode new line characters after \ get removed from output in both
+        // template literals and strings
+        return ""
       }
-      return String.fromCharCode(octal)
+      return String.fromCharCode(ch)
     }
-    if (isNewLine(ch)) {
-      // Unicode new line characters after \ get removed from output in both
-      // template literals and strings
-      return ""
+  };
+
+  // Used to read character escape sequences ('\x', '\u', '\U').
+
+  pp$9.readHexChar = function(len) {
+    var codePos = this.pos;
+    var n = this.readInt(16, len);
+    if (n === null) { this.invalidStringToken(codePos, "Bad character escape sequence"); }
+    return n
+  };
+
+  // Read an identifier, and return it as a string. Sets `this.containsEsc`
+  // to whether the word contained a '\u' escape.
+  //
+  // Incrementally adds only escaped chars, adding other chunks as-is
+  // as a micro-optimization.
+
+  pp$9.readWord1 = function() {
+    this.containsEsc = false;
+    var word = "", first = true, chunkStart = this.pos;
+    var astral = this.options.ecmaVersion >= 6;
+    while (this.pos < this.input.length) {
+      var ch = this.fullCharCodeAtPos();
+      if (isIdentifierChar(ch, astral)) {
+        this.pos += ch <= 0xffff ? 1 : 2;
+      } else if (ch === 92) { // "\"
+        this.containsEsc = true;
+        word += this.input.slice(chunkStart, this.pos);
+        var escStart = this.pos;
+        if (this.input.charCodeAt(++this.pos) !== 117) // "u"
+          { this.invalidStringToken(this.pos, "Expecting Unicode escape sequence \\uXXXX"); }
+        ++this.pos;
+        var esc = this.readCodePoint();
+        if (!(first ? isIdentifierStart : isIdentifierChar)(esc, astral))
+          { this.invalidStringToken(escStart, "Invalid Unicode escape"); }
+        word += codePointToString$1(esc);
+        chunkStart = this.pos;
+      } else {
+        break
+      }
+      first = false;
     }
-    return String.fromCharCode(ch)
-  }
-};
-
-// Used to read character escape sequences ('\x', '\u', '\U').
-
-pp$8.readHexChar = function(len) {
-  var codePos = this.pos;
-  var n = this.readInt(16, len);
-  if (n === null) { this.invalidStringToken(codePos, "Bad character escape sequence"); }
-  return n
-};
-
-// Read an identifier, and return it as a string. Sets `this.containsEsc`
-// to whether the word contained a '\u' escape.
-//
-// Incrementally adds only escaped chars, adding other chunks as-is
-// as a micro-optimization.
-
-pp$8.readWord1 = function() {
-  var this$1 = this;
-
-  this.containsEsc = false;
-  var word = "", first = true, chunkStart = this.pos;
-  var astral = this.options.ecmaVersion >= 6;
-  while (this.pos < this.input.length) {
-    var ch = this$1.fullCharCodeAtPos();
-    if (isIdentifierChar(ch, astral)) {
-      this$1.pos += ch <= 0xffff ? 1 : 2;
-    } else if (ch === 92) { // "\"
-      this$1.containsEsc = true;
-      word += this$1.input.slice(chunkStart, this$1.pos);
-      var escStart = this$1.pos;
-      if (this$1.input.charCodeAt(++this$1.pos) !== 117) // "u"
-        { this$1.invalidStringToken(this$1.pos, "Expecting Unicode escape sequence \\uXXXX"); }
-      ++this$1.pos;
-      var esc = this$1.readCodePoint();
-      if (!(first ? isIdentifierStart : isIdentifierChar)(esc, astral))
-        { this$1.invalidStringToken(escStart, "Invalid Unicode escape"); }
-      word += codePointToString(esc);
-      chunkStart = this$1.pos;
-    } else {
-      break
+    return word + this.input.slice(chunkStart, this.pos)
+  };
+
+  // Read an identifier or keyword token. Will check for reserved
+  // words when necessary.
+
+  pp$9.readWord = function() {
+    var word = this.readWord1();
+    var type = types.name;
+    if (this.keywords.test(word)) {
+      if (this.containsEsc) { this.raiseRecoverable(this.start, "Escape sequence in keyword " + word); }
+      type = keywords$1[word];
     }
-    first = false;
+    return this.finishToken(type, word)
+  };
+
+  // Acorn is a tiny, fast JavaScript parser written in JavaScript.
+
+  var version = "6.2.0";
+
+  // The main exported interface (under `self.acorn` when in the
+  // browser) is a `parse` function that takes a code string and
+  // returns an abstract syntax tree as specified by [Mozilla parser
+  // API][api].
+  //
+  // [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
+
+  function parse(input, options) {
+    return Parser.parse(input, options)
   }
-  return word + this.input.slice(chunkStart, this.pos)
-};
-
-// Read an identifier or keyword token. Will check for reserved
-// words when necessary.
-
-pp$8.readWord = function() {
-  var word = this.readWord1();
-  var type = types.name;
-  if (this.keywords.test(word)) {
-    if (this.containsEsc) { this.raiseRecoverable(this.start, "Escape sequence in keyword " + word); }
-    type = keywords$1[word];
+
+  // This function tries to parse a single expression at a given
+  // offset in a string. Useful for parsing mixed-language formats
+  // that embed JavaScript expressions.
+
+  function parseExpressionAt(input, pos, options) {
+    return Parser.parseExpressionAt(input, pos, options)
+  }
+
+  // Acorn is organized as a tokenizer and a recursive-descent parser.
+  // The `tokenizer` export provides an interface to the tokenizer.
+
+  function tokenizer(input, options) {
+    return Parser.tokenizer(input, options)
   }
-  return this.finishToken(type, word)
-};
-
-// Acorn is a tiny, fast JavaScript parser written in JavaScript.
-//
-// Acorn was written by Marijn Haverbeke, Ingvar Stepanyan, and
-// various contributors and released under an MIT license.
-//
-// Git repositories for Acorn are available at
-//
-//     http://marijnhaverbeke.nl/git/acorn
-//     https://github.com/acornjs/acorn.git
-//
-// Please use the [github bug tracker][ghbt] to report issues.
-//
-// [ghbt]: https://github.com/acornjs/acorn/issues
-//
-// [walk]: util/walk.js
-
-var version = "6.1.0";
-
-// The main exported interface (under `self.acorn` when in the
-// browser) is a `parse` function that takes a code string and
-// returns an abstract syntax tree as specified by [Mozilla parser
-// API][api].
-//
-// [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
-
-function parse(input, options) {
-  return Parser.parse(input, options)
-}
-
-// This function tries to parse a single expression at a given
-// offset in a string. Useful for parsing mixed-language formats
-// that embed JavaScript expressions.
-
-function parseExpressionAt(input, pos, options) {
-  return Parser.parseExpressionAt(input, pos, options)
-}
-
-// Acorn is organized as a tokenizer and a recursive-descent parser.
-// The `tokenizer` export provides an interface to the tokenizer.
-
-function tokenizer(input, options) {
-  return Parser.tokenizer(input, options)
-}
-
-exports.version = version;
-exports.parse = parse;
-exports.parseExpressionAt = parseExpressionAt;
-exports.tokenizer = tokenizer;
-exports.Parser = Parser;
-exports.defaultOptions = defaultOptions;
-exports.Position = Position;
-exports.SourceLocation = SourceLocation;
-exports.getLineInfo = getLineInfo;
-exports.Node = Node;
-exports.TokenType = TokenType;
-exports.tokTypes = types;
-exports.keywordTypes = keywords$1;
-exports.TokContext = TokContext;
-exports.tokContexts = types$1;
-exports.isIdentifierChar = isIdentifierChar;
-exports.isIdentifierStart = isIdentifierStart;
-exports.Token = Token;
-exports.isNewLine = isNewLine;
-exports.lineBreak = lineBreak;
-exports.lineBreakG = lineBreakG;
-exports.nonASCIIwhitespace = nonASCIIwhitespace;
-
-Object.defineProperty(exports, '__esModule', { value: true });
-
-})));
-//# sourceMappingURL=acorn.js.map
+
+  exports.Node = Node;
+  exports.Parser = Parser;
+  exports.Position = Position;
+  exports.SourceLocation = SourceLocation;
+  exports.TokContext = TokContext;
+  exports.Token = Token;
+  exports.TokenType = TokenType;
+  exports.defaultOptions = defaultOptions;
+  exports.getLineInfo = getLineInfo;
+  exports.isIdentifierChar = isIdentifierChar;
+  exports.isIdentifierStart = isIdentifierStart;
+  exports.isNewLine = isNewLine;
+  exports.keywordTypes = keywords$1;
+  exports.lineBreak = lineBreak;
+  exports.lineBreakG = lineBreakG;
+  exports.nonASCIIwhitespace = nonASCIIwhitespace;
+  exports.parse = parse;
+  exports.parseExpressionAt = parseExpressionAt;
+  exports.tokContexts = types$1;
+  exports.tokTypes = types;
+  exports.tokenizer = tokenizer;
+  exports.version = version;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+}));
diff --git a/deps/acorn/acorn/package.json b/deps/acorn/acorn/package.json
index fc42527fd4a8f1..446e6b065bb3aa 100644
--- a/deps/acorn/acorn/package.json
+++ b/deps/acorn/acorn/package.json
@@ -4,7 +4,7 @@
   "homepage": "https://github.com/acornjs/acorn",
   "main": "dist/acorn.js",
   "module": "dist/acorn.mjs",
-  "version": "6.1.0",
+  "version": "6.2.0",
   "engines": {"node": ">=0.4.0"},
   "maintainers": [
     {
diff --git a/lib/assert.js b/lib/assert.js
index 855f8443327584..a1b22d3e462e59 100644
--- a/lib/assert.js
+++ b/lib/assert.js
@@ -204,7 +204,6 @@ function parseCode(code, offset) {
     const acorn = require('internal/deps/acorn/acorn/dist/acorn');
     const privateMethods =
       require('internal/deps/acorn-plugins/acorn-private-methods/index');
-    const bigInt = require('internal/deps/acorn-plugins/acorn-bigint/index');
     const classFields =
       require('internal/deps/acorn-plugins/acorn-class-fields/index');
     const numericSeparator =
@@ -216,7 +215,6 @@ function parseCode(code, offset) {
 
     const Parser = acorn.Parser.extend(
       privateMethods,
-      bigInt,
       classFields,
       numericSeparator,
       staticClassFeatures
@@ -228,7 +226,7 @@ function parseCode(code, offset) {
   // Parse the read code until the correct expression is found.
   do {
     try {
-      node = parseExpressionAt(code, start);
+      node = parseExpressionAt(code, start, { ecmaVersion: 11 });
       start = node.end + 1 || start;
       // Find the CallExpression in the tree.
       node = findNodeAround(node, offset, 'CallExpression');
diff --git a/lib/internal/repl/await.js b/lib/internal/repl/await.js
index 6fb10bbba0d2b8..ed58e89529ad3b 100644
--- a/lib/internal/repl/await.js
+++ b/lib/internal/repl/await.js
@@ -6,7 +6,6 @@ const acorn = require('internal/deps/acorn/acorn/dist/acorn');
 const walk = require('internal/deps/acorn/acorn-walk/dist/walk');
 const privateMethods =
   require('internal/deps/acorn-plugins/acorn-private-methods/index');
-const bigInt = require('internal/deps/acorn-plugins/acorn-bigint/index');
 const classFields =
   require('internal/deps/acorn-plugins/acorn-class-fields/index');
 const numericSeparator =
@@ -16,7 +15,6 @@ const staticClassFeatures =
 
 const parser = acorn.Parser.extend(
   privateMethods,
-  bigInt,
   classFields,
   numericSeparator,
   staticClassFeatures
@@ -93,7 +91,7 @@ function processTopLevelAwait(src) {
   const wrappedArray = wrapped.split('');
   let root;
   try {
-    root = parser.parse(wrapped, { ecmaVersion: 10 });
+    root = parser.parse(wrapped, { ecmaVersion: 11 });
   } catch {
     return null;
   }
diff --git a/lib/internal/repl/utils.js b/lib/internal/repl/utils.js
index 2ad78a8ab4dfaa..d60b33208883d4 100644
--- a/lib/internal/repl/utils.js
+++ b/lib/internal/repl/utils.js
@@ -3,7 +3,6 @@
 const acorn = require('internal/deps/acorn/acorn/dist/acorn');
 const privateMethods =
   require('internal/deps/acorn-plugins/acorn-private-methods/index');
-const bigInt = require('internal/deps/acorn-plugins/acorn-bigint/index');
 const classFields =
   require('internal/deps/acorn-plugins/acorn-class-fields/index');
 const numericSeparator =
@@ -44,7 +43,6 @@ function isRecoverableError(e, code) {
   const RecoverableParser = AcornParser
     .extend(
       privateMethods,
-      bigInt,
       classFields,
       numericSeparator,
       staticClassFeatures,
@@ -78,7 +76,7 @@ function isRecoverableError(e, code) {
   // Try to parse the code with acorn.  If the parse fails, ignore the acorn
   // error and return the recoverable status.
   try {
-    RecoverableParser.parse(code, { ecmaVersion: 10 });
+    RecoverableParser.parse(code, { ecmaVersion: 11 });
 
     // Odd case: the underlying JS engine (V8, Chakra) rejected this input
     // but Acorn detected no issue.  Presume that additional text won't
diff --git a/node.gyp b/node.gyp
index 9a5556c2eff40d..9f8c9ccc6abba9 100644
--- a/node.gyp
+++ b/node.gyp
@@ -223,7 +223,6 @@
       'deps/node-inspect/lib/internal/inspect_repl.js',
       'deps/acorn/acorn/dist/acorn.js',
       'deps/acorn/acorn-walk/dist/walk.js',
-      'deps/acorn-plugins/acorn-bigint/index.js',
       'deps/acorn-plugins/acorn-class-fields/index.js',
       'deps/acorn-plugins/acorn-numeric-separator/index.js',
       'deps/acorn-plugins/acorn-private-class-elements/index.js',
diff --git a/tools/license-builder.sh b/tools/license-builder.sh
index d4c39203884df3..7875a0cd24e4a4 100755
--- a/tools/license-builder.sh
+++ b/tools/license-builder.sh
@@ -30,7 +30,7 @@ fi
 
 # Dependencies bundled in distributions
 addlicense "Acorn" "deps/acorn" "$(cat ${rootdir}/deps/acorn/acorn/LICENSE)"
-addlicense "Acorn plugins" "deps/acorn-plugins" "$(cat ${rootdir}/deps/acorn-plugins/acorn-bigint/LICENSE)"
+addlicense "Acorn plugins" "deps/acorn-plugins" "$(cat ${rootdir}/deps/acorn-plugins/acorn-class-fields/LICENSE)"
 addlicense "c-ares" "deps/cares" "$(tail -n +3 ${rootdir}/deps/cares/LICENSE.md)"
 addlicense "HTTP Parser" "deps/http_parser" "$(cat deps/http_parser/LICENSE-MIT)"
 if [ -f "${rootdir}/deps/icu/LICENSE" ]; then