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Developer tools · #babel
Learn how to diagnose and fix common core-js issues, from runtime TypeError crashes in old browsers to excessive bundle bloat, using Babel's useBuiltIns strategies.
Learn the critical difference between core-js 'entry' and 'pure' polyfilling strategies to avoid global namespace pollution in JavaScript libraries.
Babel duplicates helper functions in every file by default. @babel/plugin-transform-runtime moves those helpers to shared imports from @babel/runtime, reducing bundle size and making polyfills explicit.
Learn how to use Babel to transpile optional chaining for legacy browsers, see a step‑by‑step example, and weigh the performance and bundle size trade‑offs.
A concise guide to diagnosing and fixing common Core‑JS polyfill problems in JavaScript builds. From missing Symbol polyfills to bundle bloat, learn how to identify conditions, run checks, and apply targeted fixes.
Learn how to use Babel's preset-env to include only the transforms needed for your target browsers and Node versions, reducing bundle size while keeping builds reproducible.
Stop bloating your bundles and polluting the global scope. Learn how to use core-js/pure to implement tree-shakable polyfills for modern JavaScript environments.
Learn how Babel’s useBuiltIns: 'usage' option adds only the polyfills your code actually uses, reducing bundle size while maintaining compatibility.
When Babel skips class property syntax, the runtime crashes. This guide walks through the most common configuration gaps, step‑by‑step checks, fixes, and escalation criteria to get your build back on track.
corejs
javascript
webpack