🎨 The exhaustive Pattern Matching library for TypeScript, with smart type inference.

Runtime type system for IO decoding/encoding

The simplest and fastest way to bundle your TypeScript libraries.

Collection of TypeScript type challenges with online judge

A tool for analyzing the output of `tsc --generateTrace`

Check TypeScript type definitions

A library of composable functions for the type-level! Transform your TypeScript types in any way you want using functions you already know.

beautiful object builders for typescript

📚 Functions and algorithms implemented purely with TypeScript's type system

The Concise TypeScript Book: A Concise Guide to Effective Development in TypeScript. Free and Open Source.

Collection of utility types, complementing TypeScript built-in mapped types and aliases (think "lodash" for static types).

A collection of essential TypeScript types

👷 TypeScript's largest type utility library

A 'CSS reset' for TypeScript, improving types for common JavaScript API's

Additional types and types adjusted utilities for TypeScript

Easy form validation and state management for React and Remix

All essential TypeScript types in one place 🤙

Compile-time tests for types. Useful to make sure types don't regress into being overly-permissive as changes go in over time.

Framework agnostic utilities for Zod

Measuring and comparing type-checking speed of TS samples

Prettify TypeScript: Better Type Previews

Everything You Need for Type Testing.

⚙️ TypeScript Style Guide. A concise set of conventions and best practices for creating consistent, maintainable code.