diff --git a/.gitignore b/.gitignore
index 67c47b9..33d4929 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,5 @@
-.DS_Store
-*.log
 coverage/
-dist/
 node_modules/
+.DS_Store
+*.log
 yarn.lock
diff --git a/.prettierignore b/.prettierignore
index 3d25895..cebe81f 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,3 +1,2 @@
 coverage/
-dist/
 *.md
diff --git a/src/index.js b/index.js
similarity index 87%
rename from src/index.js
rename to index.js
index c80fb37..4e40f85 100644
--- a/src/index.js
+++ b/index.js
@@ -2,12 +2,13 @@ let warningIssued
 
 const defaults = {2: {before: 2}}
 
-export default function (options) {
+export default function remarkHeadingGap(options) {
   const data = this.data()
   const gaps = {...defaults, ...options}
   const headingGap = {join: [betweenHeading]}
 
-  /* istanbul ignore next - old remark. */
+  // Old remark.
+  /* c8 ignore next 11 */
   if (
     !warningIssued &&
     this.Compiler &&
@@ -20,7 +21,8 @@ export default function (options) {
     )
   }
 
-  /* istanbul ignore next - other extensions */
+  // Other extensions
+  /* c8 ignore next */
   if (!data.toMarkdownExtensions) data.toMarkdownExtensions = []
 
   data.toMarkdownExtensions.push(headingGap)
diff --git a/package.json b/package.json
index 15eddd0..3919156 100644
--- a/package.json
+++ b/package.json
@@ -27,18 +27,13 @@
     "Ben Briggs <beneb.info@gmail.com> (http://beneb.info)",
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
-  "main": "dist/index.js",
-  "module": "src/index.js",
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
-    "dist",
-    "src/index.js"
+    "index.js"
   ],
   "devDependencies": {
-    "@babel/cli": "^7.0.0",
-    "@babel/core": "^7.0.0",
-    "@babel/preset-env": "^7.0.0",
-    "@babel/register": "^7.0.0",
-    "babel-plugin-add-module-exports": "^1.0.0",
     "c8": "^7.0.0",
     "prettier": "^2.0.0",
     "remark": "^13.0.0",
@@ -48,21 +43,10 @@
     "xo": "^0.37.0"
   },
   "scripts": {
-    "prepublishOnly": "npm run compile",
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "compile": "babel src --out-dir dist --ignore src/**/__tests__",
     "test-api": "node --conditions development test/index.js",
     "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov npm run test-api",
-    "test": "npm run compile && npm run format && npm run test-coverage"
-  },
-  "browserslist": "> 2.5%, node 6",
-  "babel": {
-    "presets": [
-      "@babel/preset-env"
-    ],
-    "plugins": [
-      "add-module-exports"
-    ]
+    "test": "npm run format && npm run test-coverage"
   },
   "prettier": {
     "tabWidth": 2,
@@ -73,10 +57,7 @@
     "trailingComma": "none"
   },
   "xo": {
-    "prettier": true,
-    "rules": {
-      "import/no-anonymous-default-export": "off"
-    }
+    "prettier": true
   },
   "#": "this plugin is currently not turned on while remark is updating",
   "remarkConfig": {
diff --git a/test/index.js b/test/index.js
index c35315c..3717c81 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,10 +1,10 @@
-const fs = require('fs')
-const path = require('path')
-const test = require('tape')
-const remark = require('remark')
-const plugin = require('../dist/index.js')
+import fs from 'fs'
+import path from 'path'
+import test from 'tape'
+import remark from 'remark'
+import plugin from '../index.js'
 
-const base = path.join(__dirname, 'fixtures')
+const base = path.join('test', 'fixtures')
 
 const specs = {}