i18n-cli

A CLI tool to synchronize and manage translations across multiple target files from a single source file.

Installation

npm i -D @tripouille/i18n-cli  

Available commands

You can run --help to see the available commands.

Command	Alias	Description	Options
status	s	Show the status of the translation files	-v, --verbose: Show the tokens that require changes -vv, --very-verbose: Show the tokens that require changes and the associated languages -foc, --fail-on-changes: Fail if there are tokens that require changes
sync	-	Synchronize translation files	-lr, --limit-retrieve <limit>: Limit the number of tokens to retrieve

Usage

Step 1: Create your CLI

First, create a JavaScript or TypeScript file for your CLI, for example, cli.ts. The example provided here is in TypeScript.

import { type CreateI18nCliParams, createI18nCli } from '@tripouille/i18n-cli'

const params: CreateI18nCliParams = { ... };
const cli = createI18nCli(params);

cli.parse();

Step 2: Compile and run your CLI

You can compile your TypeScript file and run the resulting JavaScript file, or you can run it directly using a TypeScript runner. Here is an example using bun:

bun run ./cli.ts status

This command will execute the status command of your CLI.

Create i18n CLI params

Property	Required	Description
i18nFolderAbsolutePath	Yes	The absolute path to the folder containing your i18n JSON files
sourceLanguage	Yes	The source language used as the reference for translations
targetLanguages	Yes	The target languages to synchronize translations for
retrieveRequiredTranslationTokens	Yes	A function to retrieve missing translation tokens
translationFileFormat	No	Configuration options for the format of the output files

Example

import {
	type CreateI18nCliParams,
	type RetrieveRequiredTranslationTokensReturn,
} from "@tripouille/i18n-cli";

const params: CreateI18nCliParams = {
	i18nFolderAbsolutePath: join(__dirname, "./locales"),
	sourceLanguage: {
		code: "en",
		name: "english",
	},
	targetLanguages: [
		{ code: "de", name: "german" },
		{ code: "es", name: "spanish" },
		{ code: "fr", name: "french" },
	],
	async retrieveRequiredTranslationTokens({ requiredTargetLanguages }) {
		const result: RetrieveRequiredTranslationTokensReturn = new Map();

		for (const language of requiredTargetLanguages) {
			const translationToken = `translation token for ${language.code}`;
			result.set(language.code, translationToken);
		}

		return result;
	},
	translationFileFormat: {
		translationFileSpace: "\t",
		translationFileTrailingNewline: true,
	},
};

The RetrieveRequiredTranslationTokens function

The retrieveRequiredTranslationTokens function is a function that retrieves the missing translation tokens for the target languages for a given token path. This function must be provided by the user. The function receives an object with the following properties:

Property	Description
translationTokenPath	The token path that requires retrieving the translation tokens for
sourceLanguage	The source language used as the reference for translations
upToDateTargetLanguages	The target languages that are already up to date
requiredTargetLanguages	The target languages for which we need to retrieve a translation
upToDateTranslationTokens	A map containing all the up-to-date translation tokens
getUpToDateTranslationTokensByTokenPath	A function to retrieve all the up-to-date translations for a given token path

The function must return a promise that resolves to a map containing the missing translation tokens for the target languages. The map must have the target language code as the key and the translation token as the value.

Feel free to provide any implementation for retrieveRequiredTranslationTokens, such as AI generation, as long as you return the expected result. If the returned promise is rejected, the changes will not be applied to the files, but the succeeded promises will be applied.

If the retrieveRequiredTranslationTokens function returns a result with missing tokens, the changes will not be applied.

Contributing

Pull requests are welcome.
For major changes, please open an issue first to discuss what you would like to change.
Please make sure to update tests as appropriate.