Languages and frameworks guide

Choose the right language and UI framework strategy for your extension surfaces, then use Extension.js defaults to keep setup minimal.

Choose by goal

Goal	Start here
Strong typing and safer refactors	TypeScript
Rich UI components with large ecosystem	React
Smaller React-like runtime	Preact
Vue single-file component workflow	Vue.js
Compiled components with minimal runtime	Svelte
Modern module syntax	ECMAScript modules
Scoped styling by default	CSS modules
Sass or Less styling workflows	Sass, Less
Browser-safe Node compatibility decisions	Node APIs in browser extensions
Performance-heavy wasm workloads	WebAssembly