Use ESM

Author: wooorm

.gitignore

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

.prettierignore

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

index.js

@@ -1,11 +1,7 @@
-'use strict'
-
-var visit = require('unist-util-visit')
-
-module.exports = compact
+import {visit} from 'unist-util-visit'
 
 // Make an mdast tree compact by merging adjacent text nodes.
-function compact(tree) {
+export function compact(tree) {
   visit(tree, visitor)
 
   return tree

package.json

@@ -23,31 +23,29 @@
   "contributors": [
     "Titus Wormer <[email protected]> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
     "index.js"
   ],
   "dependencies": {
-    "unist-util-visit": "^2.0.0"
+    "unist-util-visit": "^3.0.0"
   },
   "devDependencies": {
-    "browserify": "^17.0.0",
-    "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",
-    "unist-builder": "^2.0.0",
-    "xo": "^0.38.0"
+    "unist-builder": "^3.0.0",
+    "xo": "^0.39.0"
   },
   "scripts": {
-    "format": "remark . -qfo && prettier . --write && xo --fix",
-    "build-bundle": "browserify . -s mdastUtilCompact -o mdast-util-compact.js",
-    "build-mangle": "browserify . -s mdastUtilCompact -o mdast-util-compact.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": "npm run format && npm run build && npm run test-coverage"
+    "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
+    "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,
@@ -59,16 +57,10 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
-    "ignores": [
-      "mdast-util-compact.js"
-    ]
-  },
-  "nyc": {
-    "check-coverage": true,
-    "lines": 100,
-    "functions": 100,
-    "branches": 100
+    "rules": {
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
+    }
   },
   "remarkConfig": {
     "plugins": [

readme.md

@@ -13,6 +13,9 @@ and blockquotes.
 
 ## 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
@@ -22,8 +25,8 @@ npm install mdast-util-compact
 ## Use
 
 ```js
-var u = require('unist-builder')
-var compact = require('mdast-util-compact')
+import {u} from 'unist-builder'
+import {compact} from 'mdast-util-compact'
 
 var tree = u('strong', [u('text', 'alpha'), u('text', ' '), u('text', 'bravo')])
 
@@ -35,12 +38,17 @@ console.log(tree)
 Yields:
 
 ```js
-{ type: 'strong',
-  children: [ { type: 'text', value: 'alpha bravo' } ] }
+{
+  type: 'strong',
+  children: [ { type: 'text', value: 'alpha bravo' } ]
+}
 ```
 
 ## API
 
+This package exports the following identifiers: `compact`.
+There is no default export.
+
 ### `compact(tree)`
 
 Walk the [tree][] and collapse nodes.

test.js

@@ -1,8 +1,6 @@
-'use strict'
-
-var test = require('tape')
-var u = require('unist-builder')
-var compact = require('.')
+import test from 'tape'
+import {u} from 'unist-builder'
+import {compact} from './index.js'
 
 test('compact()', function (t) {
   t.same(