Individual skill
babel-pro
Configure Babel: presets, plugins, env-specific builds, polyfills, and performance. Use when maintaining Babel-based toolchains or writing custom transforms.
skills/babel-pro/SKILL.md
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# Babel Pro
A practical guide to Babel: presets and plugins, environment-specific configuration, polyfill strategy, and performance — for the many codebases where Babel is still the transform layer, and for anyone writing custom Babel plugins.
## Overview
Babel transforms JavaScript via a plugin pipeline: **parse → transform (plugins) → generate**. Presets are plugin bundles (`@babel/preset-env`, `@babel/preset-react`, `@babel/preset-typescript`). Babel's strength is its unmatched plugin ecosystem and precise targeting; its weakness is speed (JS-based, single-threaded per file). Modern guidance: keep Babel where its plugins earn their keep, use faster tools elsewhere.
## When to use
- Maintaining CRA-era, Jest, or custom webpack Babel pipelines.
- Custom syntax transforms (Babel plugins for codemods or DSLs).
- Precise browser targeting with `preset-env` + `core-js` polyfills.
- React Native / Metro bundler setups (Babel-based).