From 83e33852c58f9f34d3f7ae32d0e216270f3bd498 Mon Sep 17 00:00:00 2001
From: Lloyd Brookes <lloyd.brookes@gmail.com>
Date: Fri, 3 Sep 2021 22:31:23 +0100
Subject: [PATCH] Rename all filename extensions from .mjs to .js

---
 README.md                                     |  4 ++--
 bin/{cli.mjs => cli.js}                       |  2 +-
 .../{index-replace.mjs => index-replace.js}   |  2 +-
 ...result-iterator.mjs => result-iterator.js} |  2 +-
 ...ind-replace.mjs => simple-find-replace.js} |  0
 example/chain/{prefix.mjs => prefix.js}       |  0
 example/chain/{suffix.mjs => suffix.js}       |  0
 example/{make-sandbox.mjs => make-sandbox.js} |  2 +-
 .../view/{custom-view.mjs => custom-view.js}  |  0
 .../{minimal-view.mjs => minimal-view.js}     |  0
 index.mjs => index.js                         |  6 +++---
 .../{find-replace.mjs => find-replace.js}     |  0
 .../{index-replace.mjs => index-replace.js}   |  0
 lib/{cli-app.mjs => cli-app.js}               | 16 +++++++--------
 lib/{cli-options.mjs => cli-options.js}       |  4 ++--
 lib/{rename-file.mjs => rename-file.js}       |  2 +-
 lib/{replace-chain.mjs => replace-chain.js}   |  6 +++---
 lib/{util.mjs => util.js}                     |  7 +++----
 lib/view/{default.mjs => default.js}          |  0
 lib/view/{diff.mjs => diff.js}                |  2 +-
 lib/view/{long.mjs => long.js}                |  2 +-
 lib/view/{one-line.mjs => one-line.js}        |  2 +-
 package.json                                  |  9 +++++----
 test/{api-bad-input.mjs => api-bad-input.js}  |  2 +-
 ...i-find-replace.mjs => api-find-replace.js} |  2 +-
 ...plugin-custom.mjs => api-plugin-custom.js} |  2 +-
 ...i-plugin-index.mjs => api-plugin-index.js} |  2 +-
 test/{cli-bad-input.mjs => cli-bad-input.js}  |  8 ++++----
 test/{cli.mjs => cli.js}                      | 20 +++++++++----------
 .../{rename-file.mjs => rename-file.js}       |  4 ++--
 .../{replace-chain.mjs => replace-chain.js}   |  6 +++---
 .../{util-win32.mjs => util-win32.js}         |  2 +-
 test/internals/{util.mjs => util.js}          |  2 +-
 test/lib/{broken-view.mjs => broken-view.js}  |  0
 .../lib/{dummy-plugin.mjs => dummy-plugin.js} |  0
 test/lib/{dummy-view.mjs => dummy-view.js}    |  0
 test/lib/{util.mjs => util.js}                |  0
 37 files changed, 59 insertions(+), 59 deletions(-)
 rename bin/{cli.mjs => cli.js} (66%)
 rename example/api/{index-replace.mjs => index-replace.js} (84%)
 rename example/api/{result-iterator.mjs => result-iterator.js} (85%)
 rename example/api/{simple-find-replace.mjs => simple-find-replace.js} (100%)
 rename example/chain/{prefix.mjs => prefix.js} (100%)
 rename example/chain/{suffix.mjs => suffix.js} (100%)
 rename example/{make-sandbox.mjs => make-sandbox.js} (97%)
 rename example/view/{custom-view.mjs => custom-view.js} (100%)
 rename example/view/{minimal-view.mjs => minimal-view.js} (100%)
 rename index.mjs => index.js (96%)
 rename lib/chain/{find-replace.mjs => find-replace.js} (100%)
 rename lib/chain/{index-replace.mjs => index-replace.js} (100%)
 rename lib/{cli-app.mjs => cli-app.js} (93%)
 rename lib/{cli-options.mjs => cli-options.js} (94%)
 rename lib/{rename-file.mjs => rename-file.js} (95%)
 rename lib/{replace-chain.mjs => replace-chain.js} (85%)
 rename lib/{util.mjs => util.js} (94%)
 rename lib/view/{default.mjs => default.js} (100%)
 rename lib/view/{diff.mjs => diff.js} (97%)
 rename lib/view/{long.mjs => long.js} (95%)
 rename lib/view/{one-line.mjs => one-line.js} (93%)
 rename test/{api-bad-input.mjs => api-bad-input.js} (98%)
 rename test/{api-find-replace.mjs => api-find-replace.js} (99%)
 rename test/{api-plugin-custom.mjs => api-plugin-custom.js} (98%)
 rename test/{api-plugin-index.mjs => api-plugin-index.js} (99%)
 rename test/{cli-bad-input.mjs => cli-bad-input.js} (90%)
 rename test/{cli.mjs => cli.js} (93%)
 rename test/internals/{rename-file.mjs => rename-file.js} (92%)
 rename test/internals/{replace-chain.mjs => replace-chain.js} (96%)
 rename test/internals/{util-win32.mjs => util-win32.js} (92%)
 rename test/internals/{util.mjs => util.js} (92%)
 rename test/lib/{broken-view.mjs => broken-view.js} (100%)
 rename test/lib/{dummy-plugin.mjs => dummy-plugin.js} (100%)
 rename test/lib/{dummy-view.mjs => dummy-view.js} (100%)
 rename test/lib/{util.mjs => util.js} (100%)

diff --git a/README.md b/README.md
index ded748d..d546d0b 100644
--- a/README.md
+++ b/README.md
@@ -87,10 +87,10 @@ class Suffix {
 export default Suffix
 ```
 
-Save the above as `suffix.mjs` then process all files in the current directory using the above plugin as the replace chain.
+Save the above as `suffix.js` then process all files in the current directory using the above plugin as the replace chain.
 
 ```
-$ renamer --dry-run --chain suffix.mjs *
+$ renamer --dry-run --chain suffix.js *
 
 Dry run
 
diff --git a/bin/cli.mjs b/bin/cli.js
similarity index 66%
rename from bin/cli.mjs
rename to bin/cli.js
index 1c4d6c1..74509e1 100755
--- a/bin/cli.mjs
+++ b/bin/cli.js
@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-import CliApp from '../lib/cli-app.mjs'
+import CliApp from '../lib/cli-app.js'
 
 const cliApp = new CliApp()
 
diff --git a/example/api/index-replace.mjs b/example/api/index-replace.js
similarity index 84%
rename from example/api/index-replace.mjs
rename to example/api/index-replace.js
index c4fbccc..9e2e0a6 100644
--- a/example/api/index-replace.mjs
+++ b/example/api/index-replace.js
@@ -1,4 +1,4 @@
-import Renamer from '../../index.mjs'
+import Renamer from '../../index.js'
 
 const renamer = new Renamer()
 const results = await renamer.rename({
diff --git a/example/api/result-iterator.mjs b/example/api/result-iterator.js
similarity index 85%
rename from example/api/result-iterator.mjs
rename to example/api/result-iterator.js
index b26c96d..52401b7 100644
--- a/example/api/result-iterator.mjs
+++ b/example/api/result-iterator.js
@@ -1,4 +1,4 @@
-import Renamer from '../../index.mjs'
+import Renamer from '../../index.js'
 
 const renamer = new Renamer()
 const options = {
diff --git a/example/api/simple-find-replace.mjs b/example/api/simple-find-replace.js
similarity index 100%
rename from example/api/simple-find-replace.mjs
rename to example/api/simple-find-replace.js
diff --git a/example/chain/prefix.mjs b/example/chain/prefix.js
similarity index 100%
rename from example/chain/prefix.mjs
rename to example/chain/prefix.js
diff --git a/example/chain/suffix.mjs b/example/chain/suffix.js
similarity index 100%
rename from example/chain/suffix.mjs
rename to example/chain/suffix.js
diff --git a/example/make-sandbox.mjs b/example/make-sandbox.js
similarity index 97%
rename from example/make-sandbox.mjs
rename to example/make-sandbox.js
index 8942018..c3d2b0a 100755
--- a/example/make-sandbox.mjs
+++ b/example/make-sandbox.js
@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 import path from 'path'
 import rimraf from 'rimraf'
-import { createFixture } from '../test/lib/util.mjs'
+import { createFixture } from '../test/lib/util.js'
 
 rimraf.sync('sandbox')
 
diff --git a/example/view/custom-view.mjs b/example/view/custom-view.js
similarity index 100%
rename from example/view/custom-view.mjs
rename to example/view/custom-view.js
diff --git a/example/view/minimal-view.mjs b/example/view/minimal-view.js
similarity index 100%
rename from example/view/minimal-view.mjs
rename to example/view/minimal-view.js
diff --git a/index.mjs b/index.js
similarity index 96%
rename from index.mjs
rename to index.js
index a51e728..c5be4c6 100644
--- a/index.mjs
+++ b/index.js
@@ -1,7 +1,7 @@
-import renameFile from './lib/rename-file.mjs'
-import ReplaceChain from './lib/replace-chain.mjs'
+import renameFile from './lib/rename-file.js'
+import ReplaceChain from './lib/replace-chain.js'
 import FileSet from 'file-set'
-import { depthFirstCompare } from './lib/util.mjs'
+import { depthFirstCompare } from './lib/util.js'
 
 /** ∆ Renamer
 ≈ A tool to rename files and folders in bulk.
diff --git a/lib/chain/find-replace.mjs b/lib/chain/find-replace.js
similarity index 100%
rename from lib/chain/find-replace.mjs
rename to lib/chain/find-replace.js
diff --git a/lib/chain/index-replace.mjs b/lib/chain/index-replace.js
similarity index 100%
rename from lib/chain/index-replace.mjs
rename to lib/chain/index-replace.js
diff --git a/lib/cli-app.mjs b/lib/cli-app.js
similarity index 93%
rename from lib/cli-app.mjs
rename to lib/cli-app.js
index dffcbd6..3196b91 100644
--- a/lib/cli-app.mjs
+++ b/lib/cli-app.js
@@ -1,15 +1,15 @@
-import { optionDefinitions, usageSections } from './cli-options.mjs'
+import { optionDefinitions, usageSections } from './cli-options.js'
 import streamReadAll from 'stream-read-all'
 import Renamer from 'renamer'
-import { regExpBuilder, loadPlugins } from './util.mjs'
+import { regExpBuilder, loadPlugins } from './util.js'
 import commandLineUsage from 'command-line-usage'
 import commandLineArgs from 'command-line-args'
-import FindReplace from './chain/find-replace.mjs'
-import IndexReplace from './chain/index-replace.mjs'
-import DefaultView from './view/default.mjs'
-import LongView from './view/long.mjs'
-import DiffView from './view/diff.mjs'
-import OneLineView from './view/one-line.mjs'
+import FindReplace from './chain/find-replace.js'
+import IndexReplace from './chain/index-replace.js'
+import DefaultView from './view/default.js'
+import LongView from './view/long.js'
+import DiffView from './view/diff.js'
+import OneLineView from './view/one-line.js'
 import { isString } from 'typical'
 import { loadModule } from 'load-module'
 
diff --git a/lib/cli-options.mjs b/lib/cli-options.js
similarity index 94%
rename from lib/cli-options.mjs
rename to lib/cli-options.js
index ba7f686..f66c100 100755
--- a/lib/cli-options.mjs
+++ b/lib/cli-options.js
@@ -28,8 +28,8 @@ const optionDefinitions = [
     type: String,
     alias: 'c',
     /*
-    Must be lazyMultiple else this command would parse all mjs files as chain plugins.
-    renamer --chain index-replace.mjs --chain ./test/lib/dummy-plugin.mjs *.mjs -d
+    Must be lazyMultiple else this command would parse all js files as chain plugins.
+    renamer --chain index-replace.js --chain ./test/lib/dummy-plugin.js *.js -d
     */
     lazyMultiple: true,
     description: 'One or more replace chain plugins to use, set the `--chain` option multiple times to build a chain. For each value, supply either: a) a path to a plugin file b) a path to an installed plugin package or c) the name of a built-in plugin, either `find-replace` or `index-replace`. The default plugin chain is `find-replace` then `index-replace`.',
diff --git a/lib/rename-file.mjs b/lib/rename-file.js
similarity index 95%
rename from lib/rename-file.mjs
rename to lib/rename-file.js
index 4b99bbf..b36cd2e 100644
--- a/lib/rename-file.mjs
+++ b/lib/rename-file.js
@@ -1,5 +1,5 @@
 import { promises as fs } from 'fs'
-import { isFileAccessible } from './util.mjs'
+import { isFileAccessible } from './util.js'
 
 const dryRunLog = {}
 
diff --git a/lib/replace-chain.mjs b/lib/replace-chain.js
similarity index 85%
rename from lib/replace-chain.mjs
rename to lib/replace-chain.js
index f419f2e..fa2f275 100644
--- a/lib/replace-chain.mjs
+++ b/lib/replace-chain.js
@@ -1,8 +1,8 @@
-import { loadPlugins } from './util.mjs'
+import { loadPlugins } from './util.js'
 import arrayify from 'array-back'
 import path from 'path'
-import FindReplace from './chain/find-replace.mjs'
-import IndexReplace from './chain/index-replace.mjs'
+import FindReplace from './chain/find-replace.js'
+import IndexReplace from './chain/index-replace.js'
 
 class ReplaceChain {
   async loadPlugins (pluginNames) {
diff --git a/lib/util.mjs b/lib/util.js
similarity index 94%
rename from lib/util.mjs
rename to lib/util.js
index 6f02b3e..a798475 100644
--- a/lib/util.mjs
+++ b/lib/util.js
@@ -1,11 +1,10 @@
-import { promises as fs } from 'fs'
-import { constants } from 'fs'
+import { promises as fs, constants } from 'fs'
 import path from 'path'
 import arrayify from 'array-back'
 import { isClass } from 'typical'
 import { loadModuleResolvedFrom, loadModuleRelativeTo } from 'load-module'
-import FindReplace from './chain/find-replace.mjs'
-import IndexReplace from './chain/index-replace.mjs'
+import FindReplace from './chain/find-replace.js'
+import IndexReplace from './chain/index-replace.js'
 import getModulePaths from 'current-module-paths'
 import * as globalDirs from 'global-dirs'
 const __dirname = getModulePaths(import.meta.url).__dirname
diff --git a/lib/view/default.mjs b/lib/view/default.js
similarity index 100%
rename from lib/view/default.mjs
rename to lib/view/default.js
diff --git a/lib/view/diff.mjs b/lib/view/diff.js
similarity index 97%
rename from lib/view/diff.mjs
rename to lib/view/diff.js
index 04a9de6..d8e8d54 100644
--- a/lib/view/diff.mjs
+++ b/lib/view/diff.js
@@ -1,5 +1,5 @@
 import chalk from 'chalk'
-import DefaultView from './default.mjs'
+import DefaultView from './default.js'
 import fastDiff from 'fast-diff'
 
 class DiffView extends DefaultView {
diff --git a/lib/view/long.mjs b/lib/view/long.js
similarity index 95%
rename from lib/view/long.mjs
rename to lib/view/long.js
index 69379e1..5e77638 100644
--- a/lib/view/long.mjs
+++ b/lib/view/long.js
@@ -1,5 +1,5 @@
 import chalk from 'chalk'
-import DefaultView from './default.mjs'
+import DefaultView from './default.js'
 
 class LongView extends DefaultView {
   logResult (result, options = {}) {
diff --git a/lib/view/one-line.mjs b/lib/view/one-line.js
similarity index 93%
rename from lib/view/one-line.mjs
rename to lib/view/one-line.js
index 04df870..e1d88a8 100644
--- a/lib/view/one-line.mjs
+++ b/lib/view/one-line.js
@@ -1,5 +1,5 @@
 import chalk from 'chalk'
-import DefaultView from './default.mjs'
+import DefaultView from './default.js'
 
 class OneLineView extends DefaultView {
   logComplete (stats, options) {
diff --git a/package.json b/package.json
index 0d1111d..707875a 100644
--- a/package.json
+++ b/package.json
@@ -4,16 +4,17 @@
   "version": "3.2.1",
   "author": "Lloyd Brookes <75pound@gmail.com>",
   "bin": {
-    "renamer": "bin/cli.mjs"
+    "renamer": "bin/cli.js"
   },
   "license": "MIT",
-  "exports": "./index.mjs",
+  "type": "module",
+  "exports": "./index.js",
   "engines": {
     "node": ">=12.17"
   },
   "repository": "https://github.com/75lb/renamer",
   "files": [
-    "index.mjs",
+    "index.js",
     "bin",
     "lib"
   ],
@@ -27,7 +28,7 @@
     "batch"
   ],
   "scripts": {
-    "test": "test-runner test/*.mjs test/internals/*.mjs",
+    "test": "test-runner test/*.js test/internals/*.js",
     "cover": "c8 npm test && c8 report --reporter=text-lcov | coveralls"
   },
   "dependencies": {
diff --git a/test/api-bad-input.mjs b/test/api-bad-input.js
similarity index 98%
rename from test/api-bad-input.mjs
rename to test/api-bad-input.js
index 3c1161d..9980d6a 100644
--- a/test/api-bad-input.mjs
+++ b/test/api-bad-input.js
@@ -1,6 +1,6 @@
 import Renamer from 'renamer'
 import assert from 'assert'
-import { createFixture } from './lib/util.mjs'
+import { createFixture } from './lib/util.js'
 import rimraf from 'rimraf'
 import fs from 'fs'
 import path from 'path'
diff --git a/test/api-find-replace.mjs b/test/api-find-replace.js
similarity index 99%
rename from test/api-find-replace.mjs
rename to test/api-find-replace.js
index 259d32d..4d3bae7 100644
--- a/test/api-find-replace.mjs
+++ b/test/api-find-replace.js
@@ -1,6 +1,6 @@
 import Renamer from 'renamer'
 import assert from 'assert'
-import { createFixture } from './lib/util.mjs'
+import { createFixture } from './lib/util.js'
 import rimraf from 'rimraf'
 import fs from 'fs'
 import path from 'path'
diff --git a/test/api-plugin-custom.mjs b/test/api-plugin-custom.js
similarity index 98%
rename from test/api-plugin-custom.mjs
rename to test/api-plugin-custom.js
index ea24d76..9012989 100644
--- a/test/api-plugin-custom.mjs
+++ b/test/api-plugin-custom.js
@@ -1,6 +1,6 @@
 import Renamer from 'renamer'
 import assert from 'assert'
-import { createFixture } from './lib/util.mjs'
+import { createFixture } from './lib/util.js'
 import rimraf from 'rimraf'
 import fs from 'fs'
 import path from 'path'
diff --git a/test/api-plugin-index.mjs b/test/api-plugin-index.js
similarity index 99%
rename from test/api-plugin-index.mjs
rename to test/api-plugin-index.js
index 439ea7f..097f647 100644
--- a/test/api-plugin-index.mjs
+++ b/test/api-plugin-index.js
@@ -1,6 +1,6 @@
 import Renamer from 'renamer'
 import assert from 'assert'
-import { createFixture } from './lib/util.mjs'
+import { createFixture } from './lib/util.js'
 import rimraf from 'rimraf'
 import fs from 'fs'
 import path from 'path'
diff --git a/test/cli-bad-input.mjs b/test/cli-bad-input.js
similarity index 90%
rename from test/cli-bad-input.mjs
rename to test/cli-bad-input.js
index 67ad3bf..f6f20ac 100644
--- a/test/cli-bad-input.mjs
+++ b/test/cli-bad-input.js
@@ -1,11 +1,11 @@
-import CliApp from '../lib/cli-app.mjs'
+import CliApp from '../lib/cli-app.js'
 import assert from 'assert'
-import { createFixture } from './lib/util.mjs'
+import { createFixture } from './lib/util.js'
 import rimraf from 'rimraf'
 import fs from 'fs'
 import path from 'path'
 import TestRunner from 'test-runner'
-import DefaultView from '../lib/view/default.mjs'
+import DefaultView from '../lib/view/default.js'
 const a = assert.strict
 
 const tom = new TestRunner.Tom()
@@ -52,7 +52,7 @@ tom.test('--view: broken plugin', async function () {
   const view = new TestView()
   const cliApp = new CliApp({ view })
   a.deepEqual(fs.existsSync(fixturePath), true)
-  await cliApp.start({ argv: ['-s', '--find', 'one', '--replace', 'yeah', fixturePath, '--view', './test/lib/broken-view.mjs'] })
+  await cliApp.start({ argv: ['-s', '--find', 'one', '--replace', 'yeah', fixturePath, '--view', './test/lib/broken-view.js'] })
   a.equal(cliApp.view.constructor.name, 'TestView')
   a.ok(/View must define a `write` method/.test(view.logs[0][0]))
   a.equal(process.exitCode, 1)
diff --git a/test/cli.mjs b/test/cli.js
similarity index 93%
rename from test/cli.mjs
rename to test/cli.js
index fac2fe4..216eab7 100644
--- a/test/cli.mjs
+++ b/test/cli.js
@@ -1,13 +1,13 @@
-import CliApp from '../lib/cli-app.mjs'
+import CliApp from '../lib/cli-app.js'
 import assert from 'assert'
-import { createFixture } from './lib/util.mjs'
+import { createFixture } from './lib/util.js'
 import rimraf from 'rimraf'
 import fs from 'fs'
 import path from 'path'
 import TestRunner from 'test-runner'
 import { spawn } from 'child_process'
-import DefaultView from '../lib/view/default.mjs'
-import DiffView from '../lib/view/diff.mjs'
+import DefaultView from '../lib/view/default.js'
+import DiffView from '../lib/view/diff.js'
 const a = assert.strict
 const tom = new TestRunner.Tom({ maxConcurrency: 1 })
 
@@ -50,9 +50,9 @@ tom.test('simple, dry run', async function () {
 tom.test('simple, using bin', async function () {
   const fixturePath = createFixture(`${testRoot}/${this.index}/one`)
   const origArgv = process.argv
-  process.argv = ['node', 'test.mjs', '-s', '--find', 'one', '--replace', 'yeah', fixturePath]
+  process.argv = ['node', 'test.js', '-s', '--find', 'one', '--replace', 'yeah', fixturePath]
   a.deepEqual(fs.existsSync(fixturePath), true)
-  const mod = await import('../bin/cli.mjs') // prints '✔︎ tmp/cli.js/3/one → tmp/cli.js/3/yeah'
+  const mod = await import('../bin/cli.js') // prints '✔︎ tmp/cli.js/3/one → tmp/cli.js/3/yeah'
   await mod.default
   process.argv = origArgv
   a.deepEqual(fs.existsSync(fixturePath), false)
@@ -97,7 +97,7 @@ tom.test('simple regexp, insensitive', async function () {
 
 tom.test('input file list on stdin', async function () {
   const fixturePath = createFixture(`${testRoot}/${this.index}/one`)
-  const renamer = spawn('node', [path.join('bin', 'cli.mjs'), '-f', 'one', '-r', 'two', '-s'])
+  const renamer = spawn('node', [path.join('bin', 'cli.js'), '-f', 'one', '-r', 'two', '-s'])
   return new Promise((resolve, reject) => {
     renamer.on('close', () => {
       a.deepEqual(fs.existsSync(`${testRoot}/${this.index}/one`), false)
@@ -211,7 +211,7 @@ tom.test('--view: load plugin', async function () {
   const fixturePath = createFixture(`${testRoot}/${this.index}/one`)
   const cliApp = new CliApp()
   a.deepEqual(fs.existsSync(fixturePath), true)
-  await cliApp.start({ argv: ['-s', '--find', 'one', '--replace', 'yeah', fixturePath, '--view', './test/lib/dummy-view.mjs'] })
+  await cliApp.start({ argv: ['-s', '--find', 'one', '--replace', 'yeah', fixturePath, '--view', './test/lib/dummy-view.js'] })
   a.equal(cliApp.view.constructor.name, 'DummyView')
   a.deepEqual(fs.existsSync(fixturePath), false)
   a.deepEqual(fs.existsSync(`${testRoot}/${this.index}/yeah`), true)
@@ -230,7 +230,7 @@ tom.test('--chain built-in', async function () {
   const fixturePath = createFixture(`${testRoot}/${this.index}/one`)
   const cliApp = new CliApp()
   a.deepEqual(fs.existsSync(fixturePath), true)
-  await cliApp.start({ argv: ['-s', '--chain', 'find-replace.mjs', '--find', 'one', '--replace', 'yeah', fixturePath] })
+  await cliApp.start({ argv: ['-s', '--chain', 'find-replace.js', '--find', 'one', '--replace', 'yeah', fixturePath] })
   a.deepEqual(fs.existsSync(fixturePath), false)
   a.deepEqual(fs.existsSync(`${testRoot}/${this.index}/yeah`), true)
 })
@@ -238,7 +238,7 @@ tom.test('--chain built-in', async function () {
 tom.test('--chain built-in local --help', async function () {
   const cliApp = new CliApp({ view: new TestView() })
   await cliApp.start({
-    argv: ['--chain', 'find-replace.mjs', '--chain', './test/lib/dummy-plugin.mjs', '--help']
+    argv: ['--chain', 'find-replace.js', '--chain', './test/lib/dummy-plugin.js', '--help']
   })
   a.ok(/FindReplace/.test(cliApp.view.logs[0][0]))
   a.ok(/DummyPlugin/.test(cliApp.view.logs[0][0]))
diff --git a/test/internals/rename-file.mjs b/test/internals/rename-file.js
similarity index 92%
rename from test/internals/rename-file.mjs
rename to test/internals/rename-file.js
index 9ea67cb..63aa9d8 100644
--- a/test/internals/rename-file.mjs
+++ b/test/internals/rename-file.js
@@ -1,7 +1,7 @@
-import renameFile from '../../lib/rename-file.mjs'
+import renameFile from '../../lib/rename-file.js'
 import assert from 'assert'
 import fs from 'fs'
-import { createFixture } from '../lib/util.mjs'
+import { createFixture } from '../lib/util.js'
 import rimraf from 'rimraf'
 import TestRunner from 'test-runner'
 const a = assert.strict
diff --git a/test/internals/replace-chain.mjs b/test/internals/replace-chain.js
similarity index 96%
rename from test/internals/replace-chain.mjs
rename to test/internals/replace-chain.js
index 145fb02..06ea760 100644
--- a/test/internals/replace-chain.mjs
+++ b/test/internals/replace-chain.js
@@ -1,4 +1,4 @@
-import ReplaceChain from '../../lib/replace-chain.mjs'
+import ReplaceChain from '../../lib/replace-chain.js'
 import assert from 'assert'
 import path from 'path'
 import TestRunner from 'test-runner'
@@ -134,7 +134,7 @@ tom.test('custom plugins plus a built-in', async function () {
   }
   const file = 'a-one-two'
   const chain = new ReplaceChain()
-  await chain.loadPlugins(['find-replace.mjs', PluginOne, PluginTwo])
+  await chain.loadPlugins(['find-replace.js', PluginOne, PluginTwo])
   const result = chain.replace(file, { find: 'a', replace: 'b' }, 0, ['a-one-two'])
   a.deepEqual(result.from, file)
   a.deepEqual(result.to, 'b-{{one}}-2')
@@ -148,7 +148,7 @@ tom.test('custom plugins plus a relative local path plugin', async function () {
     }
   }
   const chain = new ReplaceChain()
-  await chain.loadPlugins(['test/lib/dummy-plugin.mjs', PluginOne])
+  await chain.loadPlugins(['test/lib/dummy-plugin.js', PluginOne])
   const result = chain.replace('start', {}, 0, [])
   a.deepEqual(result.from, 'start')
   a.deepEqual(result.to, 'file: start, bindex: 0, file count: 0')
diff --git a/test/internals/util-win32.mjs b/test/internals/util-win32.js
similarity index 92%
rename from test/internals/util-win32.mjs
rename to test/internals/util-win32.js
index 842a2b1..2882465 100644
--- a/test/internals/util-win32.mjs
+++ b/test/internals/util-win32.js
@@ -1,4 +1,4 @@
-import { depthFirstCompare } from '../../lib/util.mjs'
+import { depthFirstCompare } from '../../lib/util.js'
 import assert from 'assert'
 import os from 'os'
 import TestRunner from 'test-runner'
diff --git a/test/internals/util.mjs b/test/internals/util.js
similarity index 92%
rename from test/internals/util.mjs
rename to test/internals/util.js
index a7cedd2..b53c339 100644
--- a/test/internals/util.mjs
+++ b/test/internals/util.js
@@ -1,4 +1,4 @@
-import { depthFirstCompare } from '../../lib/util.mjs'
+import { depthFirstCompare } from '../../lib/util.js'
 import assert from 'assert'
 import rimraf from 'rimraf'
 import TestRunner from 'test-runner'
diff --git a/test/lib/broken-view.mjs b/test/lib/broken-view.js
similarity index 100%
rename from test/lib/broken-view.mjs
rename to test/lib/broken-view.js
diff --git a/test/lib/dummy-plugin.mjs b/test/lib/dummy-plugin.js
similarity index 100%
rename from test/lib/dummy-plugin.mjs
rename to test/lib/dummy-plugin.js
diff --git a/test/lib/dummy-view.mjs b/test/lib/dummy-view.js
similarity index 100%
rename from test/lib/dummy-view.mjs
rename to test/lib/dummy-view.js
diff --git a/test/lib/util.mjs b/test/lib/util.js
similarity index 100%
rename from test/lib/util.mjs
rename to test/lib/util.js