A CSS transformation engine that parses styles into an AST, letting JS plugins lint, prefix, and rewrite CSS — the foundation beneath Autoprefixer, Tailwind, and 200+ other tools.

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Library npm

tailwind-merge

Merge Tailwind CSS classes without style conflicts

date-fns

Modern JavaScript date utility library with 200+ pure, immutable functions

Autoprefixer

Parses your CSS and automatically adds vendor prefixes using real-world browser usage data from Can I Use.

Axios

Promise-based HTTP client for the browser and Node.js with interceptors, automatic transforms, and cancellation

class-variance-authority

A tiny TypeScript utility for building type-safe, variant-driven className APIs on top of clsx.

esbuild

An extremely fast JavaScript and CSS bundler and minifier written in Go.

Zustand

A small, fast React state management library with a hook-based API and no boilerplate.

eslint-plugin-import

ESLint rules that validate ES module import/export syntax and catch broken paths before they hit your build.

Marked

A fast, low-level Markdown compiler that parses CommonMark and GFM into HTML in Node.js, browsers, or the CLI.

Sentry JavaScript (@sentry/browser)

The official Sentry SDK for capturing errors, performance traces, and session replays in browser JavaScript apps.

Sass

The reference Dart implementation of Sass, the mature CSS preprocessor that compiles SCSS and indented syntax to standards-compliant CSS.

pytest

The Python testing framework that makes writing small tests easy and scales to complex functional test suites.

tailwindcss-animate

Tailwind CSS plugin for enter and exit animations using utility classes

tw-animate-css

A pure-CSS, Tailwind CSS v4 compatible replacement for tailwindcss-animate.

@hookform/resolvers

Official React Hook Form adapters that plug 20+ schema-validation libraries — Zod, Yup, Joi, Valibot, ArkType and more — straight into useForm's resolver.