How to optimize a script written for production?

To optimize scripts for production, several key aspects should be considered:

• Minification and compression of code (e.g., using terser, UglifyJS) to reduce file size.
• Utilizing caching (HTTP cache, service workers) to decrease the number of requests.
• Asynchronous script loading (defer, async) to improve page load times.
• Removing unused code (tree shaking) and dependency optimization.
• Profiling and addressing performance bottlenecks (e.g., excessive loops, heavy computations).
• Using CDN to deliver scripts closer to the user.

Example of minification using terser in Node.js:

const Terser = require('terser');
const code = `function add(a, b) { return a + b; }`;
const result = Terser.minify(code);
console.log(result.code); // function add(a,b){return a+b}