babel-plugin-preval

/* To run this example: 1. Install dependencies: npm install --save-dev @babel/core @babel/cli babel-plugin-preval 2. Create a 'babel.config.js' in your project root: module.exports = { plugins: ['babel-plugin-preval'], }; 3. Create a file named 'greeting.txt' in the same directory as this script: Hello from Preval! 4. Create a file named 'preval-data.js' in the same directory as this script: module.exports = { message: 'This data was pre-evaluated at build time!' }; 5. Run Babel to transpile: npx babel your-script.ts --out-file compiled-script.js 6. Run the compiled script: node compiled-script.js */ // This code demonstrates using preval to read a file at build-time. const greeting = preval` const fs = require('fs'); const path = require('path'); // Using require.resolve and __dirname ensures correct path resolution during build module.exports = fs.readFileSync(path.resolve(__dirname, './greeting.txt'), 'utf8'); `; // This code demonstrates using preval.require to evaluate a JavaScript module at build-time. const dynamicData = preval.require('./preval-data.js'); console.log('Pre-evaluated greeting:', greeting); console.log('Pre-evaluated dynamic data:', dynamicData); // Expected output of the compiled and run script: // Pre-evaluated greeting: Hello from Preval! // Pre-evaluated dynamic data: { message: 'This data was pre-evaluated at build time!' }