Use ESM

Author: wooorm

.gitignore

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

.prettierignore

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

index.js

@@ -1,8 +1,4 @@
-'use strict'
-
-module.exports = style
-
-function style(node, relative) {
+export function headingStyle(node, relative) {
   var last = node.children[node.children.length - 1]
   var depth = node.depth
   var pos = node && node.position && node.position.end

package.json

@@ -24,28 +24,26 @@
   "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": "^13.0.0",
     "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 mdastUtilHeadingStyle -o mdast-util-heading-style.js",
-    "build-mangle": "browserify . -s mdastUtilHeadingStyle -o mdast-util-heading-style.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,
@@ -57,16 +55,10 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
-    "ignore": [
-      "mdast-util-heading-style.js"
-    ]
-  },
-  "nyc": {
-    "check-coverage": true,
-    "lines": 100,
-    "functions": 100,
-    "branches": 100
+    "rules": {
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
+    }
   },
   "remarkConfig": {
     "plugins": [

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
@@ -21,23 +24,26 @@ npm install mdast-util-heading-style
 ## Use
 
 ```js
-var style = require('mdast-util-heading-style')
-var unified = require('unified')
-var parse = require('remark-parse')
+import unified from 'unified'
+import remarkParse from 'remark-parse'
+import {headingStyle} from 'mdast-util-heading-style'
 
-var processor = unified().use(parse)
+var processor = unified().use(remarkParse)
 
-style(processor.parse('# ATX').children[0]) // => 'atx'
-style(processor.parse('# ATX #\n').children[0]) // => 'atx-closed'
-style(processor.parse('ATX\n===').children[0]) // => 'setext'
+headingStyle(processor.parse('# ATX').children[0]) // => 'atx'
+headingStyle(processor.parse('# ATX #\n').children[0]) // => 'atx-closed'
+headingStyle(processor.parse('ATX\n===').children[0]) // => 'setext'
 
-style(processor.parse('### ATX').children[0]) // => null
-style(processor.parse('### ATX').children[0], 'setext') // => 'setext'
+headingStyle(processor.parse('### ATX').children[0]) // => null
+headingStyle(processor.parse('### ATX').children[0], 'setext') // => 'setext'
 ```
 
 ## API
 
-### `style(node[, relative])`
+This package exports the following identifiers: `headingStyle`.
+There is no default export.
+
+### `headingStyle(node[, relative])`
 
 Get the heading style of a node.
 

test.js

@@ -1,105 +1,107 @@
-'use strict'
+import test from 'tape'
+import remark from 'remark'
+import {headingStyle} from './index.js'
 
-var test = require('tape')
-var remark = require('remark')()
-var style = require('.')
-
-test('mdast-util-heading-style', function (t) {
+test('headingStyle', function (t) {
   t.throws(function () {
-    style()
+    headingStyle()
   }, 'should fail without node')
 
   t.equal(
-    style({
+    headingStyle({
       type: 'heading',
       children: [{type: 'text', value: 'foo'}]
     }),
     null,
     'should NOT fail on undetectable nodes'
   )
 
-  t.equal(style(remark.parse('# ATX').children[0]), 'atx', 'should detect atx')
+  t.equal(
+    headingStyle(remark.parse('# ATX').children[0]),
+    'atx',
+    'should detect atx'
+  )
 
   t.equal(
-    style(remark.parse('# ATX #').children[0]),
+    headingStyle(remark.parse('# ATX #').children[0]),
     'atx-closed',
     'should detect closed atx'
   )
 
   t.equal(
-    style(remark.parse('ATX\n===').children[0]),
+    headingStyle(remark.parse('ATX\n===').children[0]),
     'setext',
     'should detect closed setext'
   )
 
   t.equal(
-    style(remark.parse('### ATX').children[0]),
+    headingStyle(remark.parse('### ATX').children[0]),
     null,
     'should work on ambiguous nodes'
   )
 
   t.equal(
-    style(remark.parse('### ATX').children[0], 'atx'),
+    headingStyle(remark.parse('### ATX').children[0], 'atx'),
     'atx',
     'should work on ambiguous nodes (preference to atx)'
   )
 
   t.equal(
-    style(remark.parse('### ATX').children[0], 'setext'),
+    headingStyle(remark.parse('### ATX').children[0], 'setext'),
     'setext',
     'should work on ambiguous nodes (preference to setext)'
   )
 
   t.equal(
-    style(remark.parse('###### ######').children[0]),
+    headingStyle(remark.parse('###### ######').children[0]),
     'atx-closed',
     'should work on empty nodes (#1)'
   )
 
   t.equal(
-    style(remark.parse('### ###').children[0]),
+    headingStyle(remark.parse('### ###').children[0]),
     'atx-closed',
     'should work on empty nodes (#2)'
   )
 
   t.equal(
-    style(remark.parse('# #').children[0]),
+    headingStyle(remark.parse('# #').children[0]),
     'atx-closed',
     'should work on empty nodes (#3)'
   )
 
   t.equal(
-    style(remark.parse('###### ').children[0], 'atx'),
+    headingStyle(remark.parse('###### ').children[0], 'atx'),
     'atx',
     'should work on empty nodes (#4)'
   )
 
   t.equal(
-    style(remark.parse('### ').children[0], 'atx'),
+    headingStyle(remark.parse('### ').children[0], 'atx'),
     'atx',
     'should work on empty nodes (#5)'
   )
 
   t.equal(
-    style(remark.parse('## ').children[0]),
+    headingStyle(remark.parse('## ').children[0]),
     'atx',
     'should work on empty nodes (#6)'
   )
 
   t.equal(
-    style(remark.parse('###### ').children[0], 'setext'),
+    headingStyle(remark.parse('###### ').children[0], 'setext'),
     'setext',
     'should work on empty nodes (#7)'
   )
 
   t.equal(
-    style(remark.parse('### ').children[0], 'setext'),
+    headingStyle(remark.parse('### ').children[0], 'setext'),
     'setext',
     'should work on empty nodes (#8)'
   )
 
   t.equal(
-    style(remark.parse('## ').children[0], 'setext'),
+    headingStyle(remark.parse('## ').children[0], 'setext'),
     'atx',
     'should work on empty nodes (#9)'
   )