aryomuzakki · June 11, 2025 10:03
diff --git a/mirror-translation-file.ts b/mirror-translation-file.ts
 /**
 * Mirror keys in en/translation.json file into other languages.
 * Will not overwrite, but non existing key will be removed.
 * 
 * Add `ts-node` and `typescript` to devDependencies or global dependencies.
 * Run with global package: `ts-node ./mirror-translation-file.ts`
 * or
 * Run with `bunx ts-node ./mirror-translation-file.ts`
 * or
 * Add to package.json scripts: `i18n-mirror: "bunx ts-node ./mirror-translation-file.ts"
 * Run with `bun run i18n-mirror`
 */

 /* eslint-disable @typescript-eslint/no-explicit-any */
 /* eslint-disable @typescript-eslint/no-var-requires */

 const fs = require('fs');
 const path = require('path');

 // optional declare language target or get target from existing config
 const { languages } = require('./i18n-config');

 // config
 const SOURCE_LANG = 'en';
 const DEFAULT_NS = 'translation';
 const BASE_PATH = './src/i18n/locales';
 const LANGUAGES: string[] = languages || ['id', 'th'];

 // Paths to the source and target JSON files
 const sourceJsonPath = `${BASE_PATH}/${SOURCE_LANG}/${DEFAULT_NS}.json`;
 const targetJsonPath: string[] = LANGUAGES.filter(lang => lang != SOURCE_LANG);

 // Function to ensure directories and files are created
 const ensureDirectoryAndFile = (filePath: string) => {
  const dirName = path.dirname(filePath);
  if (!fs.existsSync(dirName)) {
    fs.mkdirSync(dirName, { recursive: true });
  }
  if (!fs.existsSync(filePath)) {
    // Create an empty JSON file if it doesn't exist
    fs.writeFileSync(filePath, JSON.stringify({}, null, 2));
  }
 };

 // Reusable function to merge source and target JSON objects
 const mergeObjects = (source: any, target: any): any => {
  const result: any = {};

  // A Set to track the keys of the source for faster lookup
  const sourceKeys = Object.keys(source);

  // Copy source keys into result in the same order
  sourceKeys.forEach(key => {
    if (typeof source[key] === 'object' && source[key] !== null) {
      // Recursively merge nested objects
      result[key] = mergeObjects(source[key], target[key] || {});
    } else {
      // Copy the key if it's missing in the target
      if (!(key in target)) {
        result[key] = source[key];
      } else {
        result[key] = target[key];
      }
    }
  });

  // Ensure that the target object only contains keys present in the source object
  const targetKeys = Object.keys(target);
  targetKeys.forEach(key => {
    if (!sourceKeys.includes(key)) {
      delete result[key];
    }
  });

  return result;
 };

 // Function to merge source JSON into multiple destination JSONs
 const mergeJsonFiles = (sourcePath: string, langs: string[], namespace: string = DEFAULT_NS) => {
  console.log('!!! Non Existing key will be removed from destination files');
  try {
    // Read the source JSON file
    const sourceJson = JSON.parse(fs.readFileSync(sourcePath, 'utf-8'));

    // Iterate over the langs array for each destination language
    langs.forEach(lang => {
      // Generate target path for the current language
      const targetPath = `${BASE_PATH}/${lang}/${namespace}.json`;

      // Ensure the directory and file exist
      ensureDirectoryAndFile(targetPath);

      // Read the existing target JSON file
      const targetJson = JSON.parse(fs.readFileSync(targetPath, 'utf-8'));

      // Perform the merge operation
      const mergedJson = mergeObjects(sourceJson, targetJson);

      // Write the merged content back to the target JSON file
      const updatedJsonString = JSON.stringify(mergedJson, null, 2);
      fs.writeFileSync(targetPath, updatedJsonString, 'utf-8');

      console.log(`Successfully updated target JSON: ${targetPath}`);
    });
  } catch (error: any) {
    console.error(`Error: ${error.message}`);
  }
 };

 // Call the function to merge JSON files
 mergeJsonFiles(sourceJsonPath, targetJsonPath);

 // output:
 // !!! Non Existing key will be removed from destination files
 // Successfully updated target JSON: ./src/i18n/locales/id/translation.json
 // Successfully updated target JSON: ./src/i18n/locales/th/translation.json
	/**
	* Mirror keys in en/translation.json file into other languages.
	* Will not overwrite, but non existing key will be removed.
	*
	* Add `ts-node` and `typescript` to devDependencies or global dependencies.
	* Run with global package: `ts-node ./mirror-translation-file.ts`
	* or
	* Run with `bunx ts-node ./mirror-translation-file.ts`
	* or
	* Add to package.json scripts: `i18n-mirror: "bunx ts-node ./mirror-translation-file.ts"
	* Run with `bun run i18n-mirror`
	*/

	/* eslint-disable @typescript-eslint/no-explicit-any */
	/* eslint-disable @typescript-eslint/no-var-requires */

	const fs = require('fs');
	const path = require('path');

	// optional declare language target or get target from existing config
	const { languages } = require('./i18n-config');

	// config
	const SOURCE_LANG = 'en';
	const DEFAULT_NS = 'translation';
	const BASE_PATH = './src/i18n/locales';
	const LANGUAGES: string[] = languages \|\| ['id', 'th'];

	// Paths to the source and target JSON files
	const sourceJsonPath = `${BASE_PATH}/${SOURCE_LANG}/${DEFAULT_NS}.json`;
	const targetJsonPath: string[] = LANGUAGES.filter(lang => lang != SOURCE_LANG);

	// Function to ensure directories and files are created
	const ensureDirectoryAndFile = (filePath: string) => {
	const dirName = path.dirname(filePath);
	if (!fs.existsSync(dirName)) {
	fs.mkdirSync(dirName, { recursive: true });
	}
	if (!fs.existsSync(filePath)) {
	// Create an empty JSON file if it doesn't exist
	fs.writeFileSync(filePath, JSON.stringify({}, null, 2));
	}
	};

	// Reusable function to merge source and target JSON objects
	const mergeObjects = (source: any, target: any): any => {
	const result: any = {};

	// A Set to track the keys of the source for faster lookup
	const sourceKeys = Object.keys(source);

	// Copy source keys into result in the same order
	sourceKeys.forEach(key => {
	if (typeof source[key] === 'object' && source[key] !== null) {
	// Recursively merge nested objects
	result[key] = mergeObjects(source[key], target[key] \|\| {});
	} else {
	// Copy the key if it's missing in the target
	if (!(key in target)) {
	result[key] = source[key];
	} else {
	result[key] = target[key];
	}
	}
	});

	// Ensure that the target object only contains keys present in the source object
	const targetKeys = Object.keys(target);
	targetKeys.forEach(key => {
	if (!sourceKeys.includes(key)) {
	delete result[key];
	}
	});

	return result;
	};

	// Function to merge source JSON into multiple destination JSONs
	const mergeJsonFiles = (sourcePath: string, langs: string[], namespace: string = DEFAULT_NS) => {
	console.log('!!! Non Existing key will be removed from destination files');
	try {
	// Read the source JSON file
	const sourceJson = JSON.parse(fs.readFileSync(sourcePath, 'utf-8'));

	// Iterate over the langs array for each destination language
	langs.forEach(lang => {
	// Generate target path for the current language
	const targetPath = `${BASE_PATH}/${lang}/${namespace}.json`;

	// Ensure the directory and file exist
	ensureDirectoryAndFile(targetPath);

	// Read the existing target JSON file
	const targetJson = JSON.parse(fs.readFileSync(targetPath, 'utf-8'));

	// Perform the merge operation
	const mergedJson = mergeObjects(sourceJson, targetJson);

	// Write the merged content back to the target JSON file
	const updatedJsonString = JSON.stringify(mergedJson, null, 2);
	fs.writeFileSync(targetPath, updatedJsonString, 'utf-8');

	console.log(`Successfully updated target JSON: ${targetPath}`);
	});
	} catch (error: any) {
	console.error(`Error: ${error.message}`);
	}
	};

	// Call the function to merge JSON files
	mergeJsonFiles(sourceJsonPath, targetJsonPath);

	// output:
	// !!! Non Existing key will be removed from destination files
	// Successfully updated target JSON: ./src/i18n/locales/id/translation.json
	// Successfully updated target JSON: ./src/i18n/locales/th/translation.json
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