build.js

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

// Read the config template
const configPath = path.join(__dirname, 'public', 'config.js');
let configContent = fs.readFileSync(configPath, 'utf8');

// Replace placeholders with environment variables
configContent = configContent
    .replace(`apiKey: '', // Will be replaced at build time`, `apiKey: '${process.env.GOOGLE_CLOUD_API_KEY || ''}',`)
    .replace(`apiKey: '', // Will be replaced at build time`, `apiKey: '${process.env.GOOGLE_TRANSLATION_API_KEY || ''}',`)
    .replace(`apiKey: '', // Will be replaced at build time`, `apiKey: '${process.env.GOOGLE_TTS_API_KEY || ''}',`)
    .replace(`apiKey: '', // Will be replaced at build time`, `apiKey: '${process.env.GOOGLE_CUSTOM_SEARCH_API_KEY || ''}',`)
    .replace(`searchEngineId: '' // Will be replaced at build time`, `searchEngineId: '${process.env.GOOGLE_CUSTOM_SEARCH_ENGINE_ID || ''}'`)
    .replace(`environment: 'production',`, `environment: '${process.env.NODE_ENV || 'production'}',`)
    .replace(`debug: false`, `debug: ${process.env.NODE_ENV === 'development'}`);

// Write the updated config file
fs.writeFileSync(configPath, configContent, 'utf8');

console.log('Config file updated with environment variables');