Use ESM

package.json

@@ -9,6 +9,7 @@
     "type": "opencollective",
     "url": "https://opencollective.com/unified"
   },
+  "type": "module",
   "devDependencies": {
     "c8": "^7.0.0",
     "camelcase": "^6.0.0",
@@ -29,8 +30,7 @@
   "scripts": {
     "postinstall": "lerna bootstrap --no-ci",
     "format": "./packages/remark-cli/cli.js . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "test-api": "tape \"packages/*/test.js\" \"test/index.js\"",
-    "test-api": "node --conditions development test/index.js",
+    "test-api": "node --conditions development test/index.js && lerna run test",
     "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov npm run test-api",
     "test": "npm run format && npm run test-coverage"
   },
@@ -44,8 +44,10 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
-    "rules": {},
+    "rules": {
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
+    },
     "ignores": [
       "**/types"
     ]

packages/remark-cli/cli.js

@@ -1,14 +1,27 @@
 #!/usr/bin/env node
-'use strict'
+import {createRequire} from 'node:module'
+import start from 'unified-args'
+import {remark} from 'remark'
 
-var start = require('unified-args')
-var extensions = require('markdown-extensions')
-var processor = require('remark')
-var proc = require('remark/package.json')
-var cli = require('./package.json')
+const require = createRequire(import.meta.url)
+
+const proc = require('remark/package.json')
+const cli = require('./package.json')
+
+// To do: enable `markdown-extensions` once it supports ESM.
+const extensions = [
+  'md',
+  'markdown',
+  'mdown',
+  'mkdn',
+  'mkd',
+  'mdwn',
+  'mkdown',
+  'ron'
+]
 
 start({
-  processor: processor,
+  processor: remark,
   name: proc.name,
   description: cli.description,
   version: [
@@ -20,5 +33,5 @@ start({
   packageField: proc.name + 'Config',
   rcName: '.' + proc.name + 'rc',
   ignoreName: '.' + proc.name + 'ignore',
-  extensions: extensions
+  extensions
 })

packages/remark-cli/package.json

@@ -22,19 +22,20 @@
   "contributors": [
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
+  "type": "module",
+  "main": "index.js",
   "bin": {
     "remark": "cli.js"
   },
   "files": [
     "cli.js"
   ],
   "dependencies": {
-    "markdown-extensions": "^1.1.0",
     "remark": "^13.0.0",
     "unified-args": "^8.0.0"
   },
   "scripts": {
-    "test": "tape test.js"
+    "test": "node --conditions development test.js"
   },
   "xo": false
 }

packages/remark-cli/test.js

@@ -1,16 +1,12 @@
-'use strict'
-
-var path = require('path')
-var execa = require('execa')
-var test = require('tape')
-
-var join = path.join
+import url from 'url'
+import execa from 'execa'
+import test from 'tape'
 
 test('remark-cli', function (t) {
   t.plan(2)
 
   t.test('should show help on `--help`', function (st) {
-    var bin = join('packages', 'remark-cli', 'cli.js')
+    const bin = url.fileURLToPath(new URL('./cli.js', import.meta.url))
 
     st.plan(1)
 
@@ -67,7 +63,7 @@ test('remark-cli', function (t) {
   })
 
   t.test('should show version on `--version`', function (st) {
-    var bin = join('packages', 'remark-cli', 'cli.js')
+    const bin = url.fileURLToPath(new URL('./cli.js', import.meta.url))
 
     st.plan(2)
 

packages/remark-parse/index.js

@@ -1,10 +1,6 @@
-'use strict'
+import fromMarkdown from 'mdast-util-from-markdown'
 
-module.exports = parse
-
-var fromMarkdown = require('mdast-util-from-markdown')
-
-function parse(options) {
+export default function remarkParse(options) {
   var self = this
 
   this.Parser = parse

packages/remark-parse/package.json

@@ -16,7 +16,6 @@
     "ast",
     "parse"
   ],
-  "types": "types/index.d.ts",
   "homepage": "https://remark.js.org",
   "repository": "https://github.com/remarkjs/remark/tree/main/packages/remark-parse",
   "bugs": "https://github.com/remarkjs/remark/issues",
@@ -32,15 +31,17 @@
     "Elijah Hamovitz <elijahhamovitz@gmail.com>",
     "Ika <ikatyang@gmail.com>"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
-    "index.js",
-    "types/index.d.ts"
+    "index.js"
   ],
   "dependencies": {
     "mdast-util-from-markdown": "^0.8.0"
   },
   "scripts": {
-    "test": "tape test.js"
+    "test": "node --conditions development test.js"
   },
   "xo": false
 }

packages/remark-parse/test.js

@@ -1,16 +1,13 @@
-'use strict'
+import test from 'tape'
+import unified from 'unified'
+import gfmSyntax from 'micromark-extension-gfm'
+import gfm from 'mdast-util-gfm/from-markdown.js'
+import remove from 'unist-util-remove-position'
+import remarkParse from './index.js'
 
-var test = require('tape')
-var unified = require('unified')
-var gfmSyntax = require('micromark-extension-gfm')
-var gfm = require('mdast-util-gfm/from-markdown')
-var remove = require('unist-util-remove-position')
-
-var parse = require('.')
-
-test('remark().parse(file)', function (t) {
+test('remarkParse', function (t) {
   t.equal(
-    unified().use(parse).parse('Alfred').children.length,
+    unified().use(remarkParse).parse('Alfred').children.length,
     1,
     'should accept a `string`'
   )
@@ -19,7 +16,7 @@ test('remark().parse(file)', function (t) {
     var tree = unified()
       .data('micromarkExtensions', [gfmSyntax()])
       .data('fromMarkdownExtensions', [gfm])
-      .use(parse)
+      .use(remarkParse)
       .parse('* [x] contact@example.com ~~strikethrough~~')
 
     remove(tree, true)

packages/remark-stringify/index.js

@@ -1,10 +1,6 @@
-'use strict'
+import toMarkdown from 'mdast-util-to-markdown'
 
-module.exports = stringify
-
-var toMarkdown = require('mdast-util-to-markdown')
-
-function stringify(options) {
+export default function remarkStringify(options) {
   var self = this
 
   this.Compiler = compile

packages/remark-stringify/package.json

@@ -31,16 +31,17 @@
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
     "Eugene Sharygin <eush77@gmail.com>"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
-    "index.js",
-    "types/index.d.ts"
+    "index.js"
   ],
-  "types": "types/index.d.ts",
   "dependencies": {
     "mdast-util-to-markdown": "^0.6.0"
   },
   "scripts": {
-    "test": "tape test.js"
+    "test": "node --conditions development test.js"
   },
   "xo": false
 }