Use ESM

Author: wooorm

.gitignore

@@ -1,3 +1,2 @@
-.nyc_output/
 coverage/
 node_modules/

index.js

@@ -1,12 +1,11 @@
-'use strict'
+import {convert} from 'unist-util-is'
 
-var convert = require('unist-util-is/convert')
-
-module.exports = remove
-
-function remove(tree, options, test) {
+export function remove(tree, options, test) {
   var is = convert(test || options)
-  var cascade = options.cascade == null ? true : options.cascade
+  var cascade =
+    options.cascade === undefined || options.cascade === null
+      ? true
+      : options.cascade
 
   return preorder(tree, null, null)
 
@@ -21,7 +20,7 @@ function remove(tree, options, test) {
       return null
     }
 
-    if (children && children.length) {
+    if (children && children.length > 0) {
       // Move all living children to the beginning of the children array.
       while (++childIndex < children.length) {
         if (preorder(children[childIndex], childIndex, node)) {

package.json

@@ -29,37 +29,35 @@
     "Eugene Sharygin <[email protected]>",
     "Titus Wormer <[email protected]> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
+  "types": "types/index.d.ts",
   "files": [
     "index.js",
     "types/index.d.ts"
   ],
-  "types": "types/index.d.ts",
   "dependencies": {
-    "unist-util-is": "^4.0.0"
+    "unist-util-is": "^5.0.0"
   },
   "devDependencies": {
+    "c8": "^7.0.0",
     "dtslint": "^4.0.0",
     "nyc": "^15.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0",
     "remark-preset-wooorm": "^8.0.0",
     "tape": "^5.0.0",
-    "unist-builder": "^2.0.0",
+    "unist-builder": "^3.0.0",
     "xo": "^0.38.0"
   },
   "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-types": "dtslint types",
     "test": "npm run format && npm run test-coverage && npm run test-types"
   },
-  "nyc": {
-    "check-coverage": true,
-    "lines": 100,
-    "functions": 100,
-    "branches": 100
-  },
   "prettier": {
     "tabWidth": 2,
     "useTabs": false,
@@ -70,17 +68,9 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
     "rules": {
-      "eqeqeq": [
-        "error",
-        "always",
-        {
-          "null": "ignore"
-        }
-      ],
-      "no-eq-null": "off",
-      "unicorn/explicit-length-check": "off"
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
     }
   },
   "remarkConfig": {

readme.md

@@ -13,6 +13,9 @@ pass the given test.
 
 ## 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
@@ -22,8 +25,8 @@ npm install unist-util-remove
 ## Use
 
 ```js
-var u = require('unist-builder')
-var remove = require('unist-util-remove')
+import {u} from 'unist-builder'
+import {remove} from 'unist-util-remove'
 
 var tree = u('root', [
   u('leaf', '1'),
@@ -49,16 +52,17 @@ Yields: (note the parent of `5` is also removed, due to `options.cascade`)
   children: [
     {
       type: 'node',
-      children: [
-        { type: 'node', children: [ { type: 'other', value: '4' } ] }
-      ]
+      children: [{type: 'node', children: [{type: 'other', value: '4'}]}]
     }
   ]
 }
 ```
 
 ## API
 
+This package exports the following identifiers: `remove`.
+There is no default export.
+
 ### `remove(tree[, options][, test])`
 
 Mutate the given [tree][] by removing all nodes that pass `test`.

test.js

@@ -1,8 +1,6 @@
-'use strict'
-
-var test = require('tape')
-var u = require('unist-builder')
-var remove = require('.')
+import test from 'tape'
+import {u} from 'unist-builder'
+import {remove} from './index.js'
 
 test('should compare nodes by partial properties', function (t) {
   var tree = u('node', [u('leaf', '1'), u('leaf', '2')])