Use ESM

.gitignore

@@ -1,8 +1,5 @@
 .DS_Store
 *.log
-.nyc_output/
 coverage/
 node_modules/
-double-metaphone.js
-double-metaphone.min.js
 yarn.lock

.prettierignore

@@ -1,4 +1,2 @@
 coverage/
-double-metaphone.js
-double-metaphone.min.js
 *.md

cli.js

@@ -1,14 +1,17 @@
 #!/usr/bin/env node
-'use strict'
+import {URL} from 'url'
+import fs from 'fs'
+import {doubleMetaphone} from './index.js'
 
-var pack = require('./package.json')
-var doubleMetaphone = require('.')
+var pack = JSON.parse(
+  String(fs.readFileSync(new URL('./package.json', import.meta.url)))
+)
 
 var argv = process.argv.slice(2)
 
-if (argv.indexOf('--help') !== -1 || argv.indexOf('-h') !== -1) {
+if (argv.includes('--help') || argv.includes('-h')) {
   console.log(help())
-} else if (argv.indexOf('--version') !== -1 || argv.indexOf('-v') !== -1) {
+} else if (argv.includes('--version') || argv.includes('-v')) {
   console.log(pack.version)
 } else if (argv.length === 0) {
   process.stdin.resume()

index.js

@@ -1,7 +1,3 @@
-'use strict'
-
-module.exports = doubleMetaphone
-
 // Match vowels (including `Y`).
 var vowels = /[AEIOUY]/
 
@@ -50,7 +46,7 @@ var dutchSch = /E[DMNR]|UY|OO/
 
 // Get the phonetics according to the Double Metaphone algorithm from a value.
 // eslint-disable-next-line complexity
-function doubleMetaphone(value) {
+export function doubleMetaphone(value) {
   var primary = ''
   var secondary = ''
   var index = 0

package.json

@@ -22,30 +22,27 @@
   "contributors": [
     "Titus Wormer <[email protected]> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "bin": "cli.js",
+  "main": "index.js",
   "files": [
     "index.js",
     "cli.js"
   ],
-  "bin": "cli.js",
-  "main": "index.js",
   "devDependencies": {
-    "browserify": "^17.0.0",
-    "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",
-    "tinyify": "^3.0.0",
     "xo": "^0.38.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "build-bundle": "browserify . -s doubleMetaphone -o double-metaphone.js",
-    "build-mangle": "browserify . -s doubleMetaphone -p tinyify -o double-metaphone.min.js",
-    "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"
   },
   "nyc": {
     "check-coverage": true,
@@ -63,13 +60,10 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
     "rules": {
-      "unicorn/prefer-includes": "off"
-    },
-    "ignores": [
-      "double-metaphone.js"
-    ]
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
+    }
   },
   "remarkConfig": {
     "plugins": [

readme.md

@@ -9,6 +9,9 @@
 
 ## Install
 
+This package is ESM only: Node 12+ is needed to use it and it must be `import`ed
+instead of `require`d.
+
 [npm][]:
 
 ```sh
@@ -17,8 +20,11 @@ npm install double-metaphone
 
 ## API
 
+This package exports the following identifiers: `doubleMetaphone`.
+There is no default export.
+
 ```js
-var doubleMetaphone = require('double-metaphone')
+import {doubleMetaphone} from 'double-metaphone'
 
 doubleMetaphone('michael') // => ['MKL', 'MXL']
 doubleMetaphone('crevalle') // => ['KRFL', 'KRF']
@@ -32,8 +38,8 @@ doubleMetaphone('allegrettos') // => ['ALKRTS', 'AKRTS']
 With [stemmer][]:
 
 ```js
-var doubleMetaphone = require('double-metaphone')
-var stemmer = require('stemmer')
+import {doubleMetaphone} from 'double-metaphone'
+import {stemmer} from 'stemmer'
 
 doubleMetaphone(stemmer('acceptingness')) // => [ 'AKSPTNK', 'AKSPTNK' ]
 doubleMetaphone(stemmer('allegrettos')) // => [ 'ALKRT', 'AKRT' ]

test.js

@@ -1,11 +1,14 @@
-'use strict'
-
-var exec = require('child_process').exec
-var PassThrough = require('stream').PassThrough
-var assert = require('assert')
-var test = require('tape')
-var version = require('./package.json').version
-var m = require('.')
+import assert from 'assert'
+import {exec} from 'child_process'
+import fs from 'fs'
+import {URL} from 'url'
+import {PassThrough} from 'stream'
+import {doubleMetaphone as m} from './index.js'
+import test from 'tape'
+
+var pack = JSON.parse(
+  String(fs.readFileSync(new URL('./package.json', import.meta.url)))
+)
 
 test('api', function (t) {
   t.equal(typeof m, 'function', 'should be a `function`')
@@ -825,12 +828,12 @@ test('cli', function (t) {
   })
 
   exec('./cli.js -v', function (error, stdout, stderr) {
-    t.deepEqual([error, stdout, stderr], [null, version + '\n', ''], '-v')
+    t.deepEqual([error, stdout, stderr], [null, pack.version + '\n', ''], '-v')
   })
   exec('./cli.js --version', function (error, stdout, stderr) {
     t.deepEqual(
       [error, stdout, stderr],
-      [null, version + '\n', ''],
+      [null, pack.version + '\n', ''],
       '--version'
     )
   })