Babel
Compiler that turns modern JavaScript into widely supported code
18 tools in our directory are marked as best for Library authors, from 8 sections: Frameworks (5), Documentation (4), Dev Utilities (2), Testing & QA (2) and 4 more sections.

Compiler that turns modern JavaScript into widely supported code


Extremely fast JavaScript and TypeScript bundler with a simple API

Property-based testing library for JavaScript and TypeScript

Positions tooltips, popovers and dropdowns on screen


Open source registry for JavaScript and TypeScript packages


Official reference, tutorial and guides for the Python language



Versioning spec using MAJOR.MINOR.PATCH numbers to signal changes

CSS-in-JS for React with SSR and React Native support

Generates HTML docs or a JSON model from TypeScript source comments

Browser editor to try TypeScript and see compiled output


Fast Vite and Vue static site generator for Markdown docs

TypeScript-first schema validation with static type inference
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