rollup-plugin-app-utils

import Utils from 'rollup-plugin-app-utils'; import path from 'path'; import fs from 'fs'; // --- Setup: Create a temporary project structure for the demo --- const projectRoot = path.resolve(__dirname, 'temp-rollup-project'); const localesDir = path.join(projectRoot, 'locales'); const outputDir = path.join(projectRoot, 'dist'); const srcDir = path.join(projectRoot, 'src'); // Ensure a clean slate and create necessary directories Utils.emptyDirectories([projectRoot]); // Clean up previous runs fs.mkdirSync(path.join(localesDir, 'en'), { recursive: true }); fs.mkdirSync(path.join(localesDir, 'es'), { recursive: true }); fs.mkdirSync(srcDir, { recursive: true }); // Create mock locale files fs.writeFileSync(path.join(localesDir, 'en', 'common.json'), JSON.stringify({ "hello": "Hello", "goodbye": "Goodbye from EN", "greeting": "Welcome" }, null, 2)); fs.writeFileSync(path.join(localesDir, 'es', 'common.json'), JSON.stringify({ "hello": "Hola", "spanish_only": "Solo español" }, null, 2)); // 'goodbye' and 'greeting' are missing here, will be back-filled // Create a mock source file that imports translations fs.writeFileSync(path.join(srcDir, 'main.js'), ` import translations from 'i18n.translations'; // Resolved by the plugin console.log('EN Hello:', translations.en.common.hello); console.log('ES Hello:', translations.es.common.hello); console.log('ES Goodbye (should be backfilled from EN):', translations.es.common.goodbye); console.log('ES Greeting (should be backfilled from EN):', translations.es.common.greeting); console.log('ES Spanish Only (should be removed by backfilling):', translations.es.common.spanish_only); // This key should be removed from ES as it's not in EN `); // --- Rollup Configuration --- export default { input: path.join(srcDir, 'main.js'), output: { dir: outputDir, format: 'es', entryFileNames: 'bundle.js', }, plugins: [ // Clean the output directory before starting the build Utils.emptyDirectories([outputDir]), // Process and bundle i18n strings, performing back-filling Utils.i18nBundler({ target: localesDir, baseLanguage: 'en', skipBackFilling: false, // Ensure back-filling happens (add missing, remove orphaned keys) transformer: (lang, data) => data, // Simple passthrough transformer }) ] }; // To run this example: // 1. Save the above code as 'rollup.config.js' in an empty directory. // 2. Run 'npm install --save-dev rollup rollup-plugin-app-utils'. // 3. Execute 'npx rollup -c'. // 4. Inspect the 'temp-rollup-project/dist/bundle.js' and 'temp-rollup-project/locales' for processed output.