Use ESM

Author: wooorm

Diff for: .gitignore

@@ -1,8 +1,5 @@
-.nyc_output/
+.DS_Store
+*.log
 coverage/
 node_modules/
-*.log
-.DS_Store
-mdast-util-to-string.js
-mdast-util-to-string.min.js
 yarn.lock

Diff for: .prettierignore

@@ -1,5 +1,2 @@
 coverage/
-*.json
 *.md
-mdast-util-to-string.js
-mdast-util-to-string.min.js

Diff for: index.js

@@ -1,11 +1,7 @@
-'use strict'
-
-module.exports = toString
-
 // Get the text content of a node.
 // Prefer the node’s plain-text fields, otherwise serialize its children,
 // and if the given value is an array, serialize the nodes in it.
-function toString(node) {
+export function toString(node) {
   return (
     (node &&
       (node.value ||

Diff for: package.json

@@ -24,31 +24,27 @@
   "contributors": [
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
+  "types": "types/index.d.ts",
   "files": [
-    "index.js",
-    "types/index.d.ts"
+    "types/index.d.ts",
+    "index.js"
   ],
-  "types": "types/index.d.ts",
   "devDependencies": {
-    "browserify": "^17.0.0",
-    "dtslint": "^4.0.0",
-    "nyc": "^15.0.0",
+    "c8": "^7.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0",
     "remark-preset-wooorm": "^8.0.0",
     "tape": "^5.0.0",
-    "tinyify": "^3.0.0",
-    "xo": "^0.38.0"
+    "xo": "^0.39.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "build-bundle": "browserify . -s mdastUtilToString -o mdast-util-to-string.js",
-    "build-mangle": "browserify . -s mdastUtilToString -o mdast-util-to-string.min.js -p tinyify",
-    "build": "npm run build-bundle && npm run build-mangle",
-    "test-api": "node test",
-    "test-coverage": "nyc --reporter lcov tape test.js",
-    "test-types": "dtslint types",
-    "test": "npm run format && npm run build && npm run test-coverage && npm run test-types"
+    "test-api": "node test.js",
+    "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node test.js",
+    "test": "npm run format && npm run test-coverage"
   },
   "prettier": {
     "tabWidth": 2,
@@ -60,18 +56,14 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
+    "rules": {
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
+    },
     "ignore": [
-      "mdast-util-to-string.js",
-      "types/test.ts"
+      "types"
     ]
   },
-  "nyc": {
-    "check-coverage": true,
-    "lines": 100,
-    "functions": 100,
-    "branches": 100
-  },
   "remarkConfig": {
     "plugins": [
       "preset-wooorm"

Diff for: readme.md

@@ -12,6 +12,9 @@
 
 ## Install
 
+This package is [ESM only](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c):
+Node 12+ is needed to use it and it must be `import`ed instead of `require`d.
+
 [npm][]:
 
 ```sh
@@ -21,19 +24,22 @@ npm install mdast-util-to-string
 ## Use
 
 ```js
-var unified = require('unified')
-var parse = require('remark-parse')
-var toString = require('mdast-util-to-string')
+import unified from 'unified'
+import remarkParse from 'remark-parse'
+import {toString} from 'mdast-util-to-string'
 
 var tree = unified()
-  .use(parse)
+  .use(remarkParse)
   .parse('Some _emphasis_, **importance**, and `code`.')
 
 console.log(toString(tree)) // => 'Some emphasis, importance, and code.'
 ```
 
 ## API
 
+This package exports the following identifiers: `toString`.
+There is no default export.
+
 ### `toString(node)`
 
 Get the text content of a [node][] or list of nodes.

Diff for: test.js

@@ -1,9 +1,7 @@
-'use strict'
+import test from 'tape'
+import {toString} from './index.js'
 
-var test = require('tape')
-var toString = require('.')
-
-test('mdast-util-to-string', function (t) {
+test('toString', function (t) {
   t.equal(toString(), '', 'should not fail on a missing node')
   t.equal(toString(null), '', 'should not fail on `null` missing node')
 

Diff for: types/tsconfig.json

@@ -1,15 +1,11 @@
 {
   "compilerOptions": {
     "moduleResolution": "node",
-    "lib": [
-      "ES5"
-    ],
+    "lib": ["ES5"],
     "strict": true,
     "baseUrl": ".",
     "paths": {
-      "mdast-util-to-string": [
-        "./index.d.ts"
-      ]
+      "mdast-util-to-string": ["./index.d.ts"]
     }
   }
 }

Diff for: types/tslint.json

@@ -1,5 +1,5 @@
 {
-"extends": "dtslint/dtslint.json",
+  "extends": "dtslint/dtslint.json",
   "rules": {
     "semicolon": false,
     "whitespace": false