Add @babel/helper-validator-identifier (#11289)

* refactor: replace esutils.keywords.isIdentifierNameES6 by helper-validator-identifier

* refactor: replace esutils isReservedWordES6 by isKeyword || isReservedWord

* address review comments

* chore: specify both “main” and “exports”

* build helper-validator-identifier before babel-types

Gulpfile.js

@@ -226,9 +226,19 @@ gulp.task("build-rollup", () => buildRollup(libBundles));
 gulp.task("build-babel-standalone", () => buildRollup(standaloneBundle));
 
 gulp.task("build-babel", () => buildBabel(/* exclude */ libBundles));
-gulp.task("build-babel-types", () =>
+gulp.task("build-babel-types-deps", () =>
+  buildBabel(
+    /* exclude */ libBundles,
+    "packages/babel-helper-validator-identifier/src/**/*.js"
+  )
+);
+gulp.task("build-babel-types-self", () =>
   buildBabel(/* exclude */ libBundles, "packages/babel-types/src/**/*.js")
 );
+gulp.task(
+  "build-babel-types",
+  gulp.series("build-babel-types-deps", "build-babel-types-self")
+);
 gulp.task("build", gulp.parallel("build-rollup", "build-babel"));
 
 gulp.task("default", gulp.series("build"));

babel.config.js

@@ -115,7 +115,10 @@ module.exports = function(api) {
     ].filter(Boolean),
     overrides: [
       {
-        test: "packages/babel-parser",
+        test: [
+          "packages/babel-parser",
+          "packages/babel-helper-validator-identifier",
+        ],
         plugins: [
           "babel-plugin-transform-charcodes",
           ["@babel/transform-for-of", { assumeArray: true }],

packages/babel-helper-builder-react-jsx-experimental/package.json

@@ -11,7 +11,6 @@
   "dependencies": {
     "@babel/helper-annotate-as-pure": "^7.8.3",
     "@babel/helper-module-imports": "^7.8.3",
-    "@babel/types": "^7.8.3",
-    "esutils": "^2.0.0"
+    "@babel/types": "^7.8.3"
   }
 }

packages/babel-helper-builder-react-jsx-experimental/src/index.js

@@ -1,4 +1,3 @@
-import esutils from "esutils";
 import * as t from "@babel/types";
 import { addNamed, addNamespace, isModule } from "@babel/helper-module-imports";
 import annotateAsPure from "@babel/helper-annotate-as-pure";
@@ -472,7 +471,7 @@ You can set \`throwIfNamespace: false\` to bypass this warning.`,
     if (t.isJSXIdentifier(node)) {
       if (node.name === "this" && t.isReferenced(node, parent)) {
         return t.thisExpression();
-      } else if (esutils.keyword.isIdentifierNameES6(node.name)) {
+      } else if (t.isValidIdentifier(node.name, false)) {
         node.type = "Identifier";
       } else {
         return t.stringLiteral(node.name);
@@ -521,7 +520,7 @@ You can set \`throwIfNamespace: false\` to bypass this warning.`,
       node.name = t.stringLiteral(
         node.name.namespace.name + ":" + node.name.name.name,
       );
-    } else if (esutils.keyword.isIdentifierNameES6(node.name.name)) {
+    } else if (t.isValidIdentifier(node.name.name, false)) {
       node.name.type = "Identifier";
     } else {
       node.name = t.stringLiteral(node.name.name);

packages/babel-helper-builder-react-jsx/package.json

@@ -10,7 +10,6 @@
   "main": "lib/index.js",
   "dependencies": {
     "@babel/helper-annotate-as-pure": "^7.8.3",
-    "@babel/types": "^7.8.3",
-    "esutils": "^2.0.0"
+    "@babel/types": "^7.8.3"
   }
 }

packages/babel-helper-builder-react-jsx/src/index.js

@@ -1,4 +1,3 @@
-import esutils from "esutils";
 import * as t from "@babel/types";
 import annotateAsPure from "@babel/helper-annotate-as-pure";
 
@@ -57,7 +56,7 @@ You can set \`throwIfNamespace: false\` to bypass this warning.`,
     if (t.isJSXIdentifier(node)) {
       if (node.name === "this" && t.isReferenced(node, parent)) {
         return t.thisExpression();
-      } else if (esutils.keyword.isIdentifierNameES6(node.name)) {
+      } else if (t.isValidIdentifier(node.name, false)) {
         node.type = "Identifier";
       } else {
         return t.stringLiteral(node.name);
@@ -104,7 +103,7 @@ You can set \`throwIfNamespace: false\` to bypass this warning.`,
       node.name = t.stringLiteral(
         node.name.namespace.name + ":" + node.name.name.name,
       );
-    } else if (esutils.keyword.isIdentifierNameES6(node.name.name)) {
+    } else if (t.isValidIdentifier(node.name.name, false)) {
       node.name.type = "Identifier";
     } else {
       node.name = t.stringLiteral(node.name.name);

packages/babel-helper-validator-identifier/.npmignore

@@ -0,0 +1,3 @@
+src
+test
+*.log

packages/babel-helper-validator-identifier/README.md

@@ -0,0 +1,19 @@
+# @babel/helper-validator-identifier
+
+> Validate identifier/keywords name
+
+See our website [@babel/helper-validator-identifier](https://babeljs.io/docs/en/next/babel-helper-validator-identifier.html) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/helper-validator-identifier
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/helper-validator-identifier --dev
+```

packages/babel-helper-validator-identifier/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "@babel/helper-validator-identifier",
+  "version": "7.9.0",
+  "description": "Validate identifier/keywords name",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-helper-validator-identifier",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./lib/index.js",
+  "exports": "./lib/index.js",
+  "dependencies": {},
+  "devDependencies": {
+    "charcodes": "^0.2.0",
+    "unicode-13.0.0": "^0.8.0"
+  }
+}

packages/babel-helper-validator-identifier/src/index.js

@@ -0,0 +1,12 @@
+export {
+  isIdentifierName,
+  isIdentifierChar,
+  isIdentifierStart,
+} from "./identifier";
+export {
+  isReservedWord,
+  isStrictBindOnlyReservedWord,
+  isStrictBindReservedWord,
+  isStrictReservedWord,
+  isKeyword,
+} from "./keyword";

packages/babel-helper-validator-identifier/src/keyword.js

@@ -0,0 +1,98 @@
+// @flow
+
+const reservedWords = {
+  keyword: [
+    "break",
+    "case",
+    "catch",
+    "continue",
+    "debugger",
+    "default",
+    "do",
+    "else",
+    "finally",
+    "for",
+    "function",
+    "if",
+    "return",
+    "switch",
+    "throw",
+    "try",
+    "var",
+    "const",
+    "while",
+    "with",
+    "new",
+    "this",
+    "super",
+    "class",
+    "extends",
+    "export",
+    "import",
+    "null",
+    "true",
+    "false",
+    "in",
+    "instanceof",
+    "typeof",
+    "void",
+    "delete",
+  ],
+  strict: [
+    "implements",
+    "interface",
+    "let",
+    "package",
+    "private",
+    "protected",
+    "public",
+    "static",
+    "yield",
+  ],
+  strictBind: ["eval", "arguments"],
+};
+const keywords = new Set(reservedWords.keyword);
+const reservedWordsStrictSet = new Set(reservedWords.strict);
+const reservedWordsStrictBindSet = new Set(reservedWords.strictBind);
+
+/**
+ * Checks if word is a reserved word in non-strict mode
+ */
+export function isReservedWord(word: string, inModule: boolean): boolean {
+  return (inModule && word === "await") || word === "enum";
+}
+
+/**
+ * Checks if word is a reserved word in non-binding strict mode
+ *
+ * Includes non-strict reserved words
+ */
+export function isStrictReservedWord(word: string, inModule: boolean): boolean {
+  return isReservedWord(word, inModule) || reservedWordsStrictSet.has(word);
+}
+
+/**
+ * Checks if word is a reserved word in binding strict mode, but it is allowed as
+ * a normal identifier.
+ */
+export function isStrictBindOnlyReservedWord(word: string): boolean {
+  return reservedWordsStrictBindSet.has(word);
+}
+
+/**
+ * Checks if word is a reserved word in binding strict mode
+ *
+ * Includes non-strict reserved words and non-binding strict reserved words
+ */
+export function isStrictBindReservedWord(
+  word: string,
+  inModule: boolean,
+): boolean {
+  return (
+    isStrictReservedWord(word, inModule) || isStrictBindOnlyReservedWord(word)
+  );
+}
+
+export function isKeyword(word: string): boolean {
+  return keywords.has(word);
+}

packages/babel-highlight/package.json

@@ -11,8 +11,8 @@
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-highlight",
   "main": "lib/index.js",
   "dependencies": {
+    "@babel/helper-validator-identifier": "^7.9.0",
     "chalk": "^2.0.0",
-    "esutils": "^2.0.2",
     "js-tokens": "^4.0.0"
   },
   "devDependencies": {

packages/babel-highlight/src/index.js

@@ -1,5 +1,5 @@
 import jsTokens, { matchToToken } from "js-tokens";
-import esutils from "esutils";
+import { isReservedWord, isKeyword } from "@babel/helper-validator-identifier";
 import Chalk from "chalk";
 
 /**
@@ -43,7 +43,7 @@ function getTokenType(match) {
   const token = matchToToken(match);
 
   if (token.type === "name") {
-    if (esutils.keyword.isReservedWordES6(token.value)) {
+    if (isKeyword(token.value) || isReservedWord(token.value)) {
       return "keyword";
     }
 

packages/babel-parser/package.json

@@ -30,8 +30,8 @@
   "devDependencies": {
     "@babel/code-frame": "^7.8.3",
     "@babel/helper-fixtures": "^7.8.6",
-    "charcodes": "^0.2.0",
-    "unicode-13.0.0": "^0.8.0"
+    "@babel/helper-validator-identifier": "^7.9.0",
+    "charcodes": "^0.2.0"
   },
   "bin": {
     "parser": "./bin/babel-parser.js"