Use ESM

index.js

@@ -1,12 +1,10 @@
-'use strict'
+import toString from 'mdast-util-to-string'
+import visit from 'unist-util-visit'
+import BananaSlug from 'github-slugger'
 
-var toString = require('mdast-util-to-string')
-var visit = require('unist-util-visit')
-var slugs = require('github-slugger')()
+const slugs = new BananaSlug()
 
-module.exports = slug
-
-function slug() {
+export default function remarkSlug() {
   return transformer
 }
 

package.json

@@ -27,11 +27,12 @@
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
     "Jayson Harshbarger <hypercubed@gmail.com>"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
-    "index.js",
-    "types/index.d.ts"
+    "index.js"
   ],
-  "types": "types/index.d.ts",
   "dependencies": {
     "github-slugger": "^1.0.0",
     "mdast-util-to-string": "^1.0.0",

test.js

@@ -1,10 +1,8 @@
-'use strict'
-
-var test = require('tape')
-var remark = require('remark')
-var u = require('unist-builder')
-var removePosition = require('unist-util-remove-position')
-var slug = require('.')
+import test from 'tape'
+import remark from 'remark'
+import u from 'unist-builder'
+import removePosition from 'unist-util-remove-position'
+import slug from './index.js'
 
 test('remark-slug', function (t) {
   t.deepEqual(