Use ESM

Author: wooorm

.gitignore

@@ -1,6 +1,5 @@
 .DS_Store
 *.log
-.nyc_output/
 coverage/
 node_modules/
 yarn.lock

.prettierignore

@@ -1,3 +1,2 @@
 coverage/
-*.json
 *.md

index.js

@@ -1,10 +1,6 @@
-'use strict'
+import {remove} from 'unist-util-remove'
 
-var remove = require('unist-util-remove')
-
-module.exports = squeeze
-
-function squeeze(tree) {
+export function squeezeParagraphs(tree) {
   return remove(tree, {cascade: false}, isEmptyParagraph)
 }
 

package.json

@@ -30,33 +30,30 @@
     "Eugene Sharygin <eush77@gmail.com>",
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
     "index.js"
   ],
   "dependencies": {
-    "unist-util-remove": "^2.0.0"
+    "unist-util-remove": "^3.0.0"
   },
   "devDependencies": {
-    "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",
-    "unist-builder": "^2.0.0",
-    "xo": "^0.38.0"
+    "unist-builder": "^3.0.0",
+    "xo": "^0.39.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "test-api": "node test",
-    "test-coverage": "nyc --reporter lcov tape test.js",
+    "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"
   },
-  "nyc": {
-    "check-coverage": true,
-    "lines": 100,
-    "functions": 100,
-    "branches": 100
-  },
   "prettier": {
     "tabWidth": 2,
     "useTabs": false,
@@ -67,9 +64,9 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
     "rules": {
-      "unicorn/no-fn-reference-in-iterator": "off"
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
     }
   },
   "remarkConfig": {

readme.md

@@ -15,6 +15,9 @@ characters.
 
 ## 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
@@ -24,8 +27,8 @@ npm install mdast-squeeze-paragraphs
 ## Use
 
 ```js
-var u = require('unist-builder')
-var squeezeParagraphs = require('mdast-squeeze-paragraphs')
+import {u} from 'unist-builder'
+import {squeezeParagraphs} from 'mdast-squeeze-paragraphs'
 
 var tree = u('root', [
   u('paragraph', []),
@@ -49,6 +52,9 @@ Yields:
 
 ## API
 
+This package exports the following identifiers: `squeezeParagraphs`.
+There is no default export.
+
 ### `squeezeParagraphs(tree)`
 
 Modifies [tree][] in-place.

test.js

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