javascript-pro

Refactoring JavaScript to ES2023+ ESM modules involves replacing CommonJS requires with static imports and converting callback-style async functions to async/await. This skill rewrites your code to use explicit try/catch error handling, optional chaining, and nullish coalescing for reliable execution.

Yes, you can refactor a Node.js backend that mixes callbacks and CommonJS into clean ES2023+ ESM code. It transforms legacy patterns into consistent async/await flows with nullish coalescing and optional chaining while improving performance hotspots.

It works with both vanilla JavaScript applications and Node.js services. The generated code applies ES2023+ patterns to Web/Fetch usage, Promise-based flows, and worker-based performance work across browser and Node.js environments.

You should avoid var, callback-style async, and synchronous I/O because they create unsafe patterns that lead to runtime issues and unhandled rejections. Replacing them with ES2023+ patterns, async/await, and explicit error handling ensures maintainable and reliable module execution.