Use ESM

.gitignore

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

.prettierignore

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

index.js

@@ -1,8 +1,4 @@
-'use strict'
-
-module.exports = interElementWhiteSpace
-
-function interElementWhiteSpace(node) {
+export function whitespace(node) {
   var value =
     node && typeof node === 'object' && node.type === 'text'
       ? node.value || ''

package.json

@@ -26,27 +26,25 @@
   "contributors": [
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
     "index.js"
   ],
   "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",
-    "xo": "^0.38.0"
+    "xo": "^0.39.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "build-bundle": "browserify . -s hastUtilWhitespace -o hast-util-whitespace.js",
-    "build-mangle": "browserify . -s hastUtilWhitespace -o hast-util-whitespace.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"
+    "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,
@@ -58,16 +56,10 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
-    "ignores": [
-      "hast-util-whitespace.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 @@ whitespace*][spec].
 
 ## 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
@@ -22,7 +25,7 @@ npm install hast-util-whitespace
 ## Use
 
 ```js
-var whitespace = require('hast-util-whitespace')
+import {whitespace} from 'hast-util-whitespace'
 
 whitespace({
   type: 'element',
@@ -43,6 +46,9 @@ whitespace({
 
 ## API
 
+This package exports the following identifiers: `whitespace`.
+There is no default export.
+
 ### `whitespace(node|value)`
 
 Check if the given value is [*inter-element whitespace*][spec].

test.js

@@ -1,7 +1,5 @@
-'use strict'
-
-var test = require('tape')
-var whitespace = require('.')
+import test from 'tape'
+import {whitespace} from './index.js'
 
 test('whitespace', function (t) {
   t.equal(whitespace(), false, 'should return `false` without node')