Core-js

ByteFE

Mar 30, 2021 · Frontend Development

Understanding Babel: Core Functions, AST, Polyfills, and Presets

This article explains Babel's role as a fundamental JavaScript compiler, detailing its parsing‑transform‑printing pipeline, AST structure, core‑js polyfills, preset‑env configuration, and runtime helpers, providing frontend developers with a comprehensive guide to mastering Babel's ecosystem and optimizing bundle size.