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Developer tools · #babel
Learn how to use @babel/preset-env with 'useBuiltIns: usage' to automatically inject only the necessary polyfills, reducing JavaScript bundle size without breaking older browser support.
Learn how to use Babel’s optional‑chaining plugin to transpile modern ?. syntax into ES5-compatible code. Step‑by‑step guide, prerequisites, expected checks and recovery options included.
Configure Babel 7 to down‑compile syntax only for browsers that need it and inject core‑js 3 polyfills only where used, with steps to verify and recover from common misconfigurations.
When JavaScript optional chaining (?.) causes unexpected failures, diagnose the issue by checking environment support, build tool configuration, and transpilation settings. This guide walks through common symptoms, fixes, and verification steps.
Stop guessing which Babel plugins you need. Learn the difference between precision plugins and automated presets to optimize your JavaScript bundle for target browsers.
Stop bloating your JS bundles with unnecessary polyfills. Learn how to use @babel/preset-env with 'useBuiltIns: usage' and core-js to inject only the code your target browsers actually need.
Babel strips TypeScript types fast but skips type checking. Keep tsc --noEmit as a CI gate to catch errors before they ship.
A step-by-step diagnostic guide for identifying why @babel/preset-env fails to transform syntax or inject polyfills for older browsers, including ordered checks and targeted fixes.
Learn how Babel's transform‑runtime plugin replaces inline helpers with imports from @babel/runtime, cutting duplicate code and preventing global namespace pollution in your JavaScript bundles.
javascript
typescript
webpack