i18n-unused

The static analyze tool for finding, marking and removing unused and missing i18n translations in your JavaScript project.

Installation

With npm:

npm install --save-dev i18n-unused

With yarn:

yarn add --dev i18n-unused

Configuration

Add config i18n-unused.config.js to your root folder:

module.exports = {
  localesPath: 'src/locales',
  srcPath: 'src',
};

Configuration options

Option name	Description	Required	Type	Default value
localesPath	path to search for locales	yes	string	-
localesExtensions	allowed file extensions for locales	no	string[]	if not set `localeNameResolver`: ['json']
localeNameResolver	file name resolver for locales	no	RegExp, (name: string) => boolean	-
localeFileParser	resolve locale imports, for example if you use named imports from locales files, just wrap it to your own resolver	no	(module) => module	fn, return `module.default` or `module`
srcPath	path to search for translations	no	string	`''` (same as run folder)
srcExtensions	allowed file extensions for translations	no	string[]	['js', 'ts', 'jsx', 'tsx', 'vue']
ignorePaths	ignored paths, eg: `['src/ignored-folder']`, should start similarly `srcPath`	no	string[]	-
translationKeyMatcher	matcher to searching for translation keys in files	no	RegExp	RegExp, match `$_`, `$t`, `t`, `$tc`, `tc` and `i18nKey`
excludeKey	doesn't process translations that include passed key(s), for example if you set `excludeKey: '.props.'`, script will ignore `Button.props.value`.	no	string, string[]	-
ignoreComments	Ignore code comments in src files.	no	boolean	false
marker	special string to mark unused translations, it'll added via `mark-unused`	no	string	'[UNUSED]'
gitCheck	show git state change tree	no	boolean	false
context	use i18n context, (eg: plurals)	no	boolean	true
flatTranslations	use flat translations, (eg: Flat JSON)	no	boolean	false
translationSeparator	separator for translations using in code	no	string	'.'
translationContextSeparator	separator for i18n context (see `context` option)	no	string	'_'

Usage

Get help:

i18n-unused -h

Display unused translations:

i18n-unused display-unused

Mark unused translations via [UNUSED] or marker from config (works only with json for now):

i18n-unused mark-unused

Remove unused translations (works only with json for now):

i18n-unused remove-unused

Sync translations (works only with json for now):

i18n-unused sync <source> <target>

Display missed translations:

i18n-unused display-missed

Usage in code

collectUnusedTranslations

If you use tool in code, you can run async function collectUnusedTranslations:

import { collectUnusedTranslations } from 'i18n-unused';

const handleTranslations = async () => {
  const unusedTranslations = await collectUnusedTranslations(
    localesPaths, // paths to locale files
    srcFilesPaths, // paths to src files
    {
      localeFileParser: (module) => module, // optional, resolver for module
      excludeTranslationKey: ['.props.'], // optional, special string or sting[] to exclude flat translations
    },
  );
};

It'll return to you follow collect:

{
  translations: [
    {
      localePath: 'locale_file_path',
      keys: ['unused_key'],
      count: 1,
    },
  ],
  totalCount: 1,
}

collectMissedTranslations

If you use tool in code, you can run async function collectMissedTranslations:

import { collectMissedTranslations } from 'i18n-unused';

const handleTranslations = async () => {
  const missedTranslations = await collectMissedTranslations(
    localesPaths, // paths to locale files
    srcFilesPaths, // paths to src files
    {
      localeFileParser: (module) => module, // optional, resolver for module
      excludeTranslationKey: ['.props.'], // optional, special string or sting[] to exclude flat translations
      translationKeyMatcher: /(?:[$ .](_|t|tc))\(.*?\)/ig, // optional, match translation keys in files
    },
  );
};

You'll get the following collection:

{
  translations: [
    {
      filePath: 'src_file_path',
      staticKeys: ['missed_key'], // keys without ${} syntax
      dynamicKeys: ['missed_key'], // keys with ${} syntax
      staticCount: 1,
      dynamicCount: 1,
    },
  ],
  totalStaticCount: 1,
  totalDynamicCount: 1,
}

generateFilesPaths

Available as async function generateFilesPaths:

import { generateFilesPaths } from 'i18n-unused';

const handleFilesPaths = async () => {
  // return array of full paths to files
  const filesPaths = await generateFilesPaths(
    srcPath, // path where search files, example: 'src/locales'
    {
      srcExtensions, // allowed file extensions, example: ['js', 'ts']
      fileNameResolver, // resolver for file name, see more info about 'localeNameResolver' option
    },
  );
};

Action results

Next actions return unusedTranslations:

displayUnusedTranslations
removeUnusedTranslations
markUnusedTranslations

Next actions return missedTranslations:

displayMissedTranslations

What else?

If the tool helped you, please rate it on github, thx. I'll be glad to your PRs =)

License

MIT License. Maxim Vishnevsky

ziermach/i18n-unused