Legacy Modernizer

Callbacks, var, and CommonJS → async/await, const, and ESM automatically.

Install on skills.sh →

Trusted trust tier

This skill has significant install counts or stars from a credible organisation.

What is legacy-to-modern?

legacy-to-modern rewrites outdated JavaScript patterns: callbacks to async/await, var to const/let, prototype chains to ES6 classes, CommonJS require() to ESM import/export. It runs AST-level transforms — not regex — preserving semantics while targeting your specified ECMAScript version.

Best for

legacy-to-modern is ideal for developers, teams, and agents who need to callbacks, var, and commonjs → async/await, const, and esm automatically.. Whether you're automating workflows, improving code quality, or extending functionality, this claude skill integrates directly into Claude Code.

Why use legacy-to-modern?

Integrates seamlessly with Claude Code
From a trusted source
Battle-tested by 810 developers
Open ecosystem standard — works across agents

Installs810

Installation and usage

Getting started with legacy-to-modern is straightforward. Follow the steps below to install this claude skill into your Claude Code environment and start using it immediately.

How to install

Make sure you have Claude Code installed. Run claude in your terminal — if it opens, you're ready.

Visit the skills.sh page for this tool and follow the install instructions. Most skills install with a single command run inside Claude Code.

After installing, type / inside Claude Code to see your installed skills and invoke them by name.

Go to install page →