Babel strips TypeScript types without checking them
Babel transpiles TypeScript by erasing types, but it never type-checks. Pair it with tsc --noEmit to catch type errors before deployment.
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Developer tools · #babel
typescriptReducing Babel Helper Duplication with @babel/plugin-transform-runtime
How @babel/plugin-transform-runtime centralises helper functions, cuts bundle bloat and avoids global namespace pollution, with practical configuration tips.
Optimizing Bundle Size with @babel/preset-env and core-js
Learn how to use @babel/preset-env with 'useBuiltIns: usage' to automatically inject only the necessary polyfills, reducing bundle size while maintaining browser compatibility.
javascriptRead Nested JavaScript Properties Safely with Optional Chaining
Use the JavaScript optional chaining operator (?.) to read nested object properties without TypeErrors, and pair it with nullish coalescing for fallback values.
Babel preset-env with usage-based core-js polyfills: architecture note
Use Babel 7 preset-env to downlevel syntax and inject only the core-js polyfills your code actually references.
Fine‑grained polyfills with @babel/preset-env and useBuiltIns: usage
Learn how Babel’s preset-env can inject only the polyfills you actually need, based on your browserslist targets, and see the trade‑offs of the usage mode.
Using @babel/plugin-transform-modules-commonjs: Architecture, Checks, and Failure Modes
Transpile ES6 modules to CommonJS with Babel’s @babel/plugin-transform-modules-commonjs. Learn the minimal config, operational checks, failure modes, and when to switch to a bundler that keeps ES modules.
Diagnosing Babel preset-env Target Mismatches That Ship Modern Syntax to Old Browsers
Builds pass and dev works, but production users see immediate SyntaxError for optional chaining or class fields. Learn to diagnose browserslist and preset-env target mismatches.
Diagnosing and Fixing Duplicate Babel Helper Functions in Your Bundle
When Babel’s build output contains duplicated helper functions, bundle size balloons and runtime errors can surface. This guide walks through spotting the symptom, identifying the cause, and applying @babel/plugin-transform-runtime to share helpers safely.