unused-i18n-keys.ts

import fs from 'fs';
import glob from 'glob';

// Step 1: Extract keys from translation files
let translationKeys: string[] = [];

// Use glob to get all .json files in the translations directory
let translationFiles = glob.sync('src/locales/en/*.json');

// Exclude files based on filename
const excludedFiles = ['source.json', 'ui.json']; // replace with your filenames
translationFiles = translationFiles.filter(
  (file) => !excludedFiles.includes(file.split('/').pop())
);

translationFiles.forEach((file) => {
  const translationFile = fs.readFileSync(file);
  translationKeys = [
    ...translationKeys,
    ...Object.keys(JSON.parse(translationFile.toString())),
  ];
});

// Step 2: Parse source code to find used keys
const usedKeys: string[] = [];

// Use glob to get all .js and .jsx files in the project directory
const files = glob.sync('src/**/*.+(js|jsx|ts|tsx)');

files.forEach((file) => {
  const sourceCode = fs.readFileSync(file, 'utf-8');
  translationKeys.forEach((key) => {
    if (sourceCode.includes(key)) {
      usedKeys.push(key);
    }
  });
});

// Step 3: Find unused keys
const unusedKeys = translationKeys.filter(
  (key) => !usedKeys.includes(key) && !key.includes('tr_song')
);

console.log('Unused keys:', JSON.stringify(unusedKeys));