millsp/ts-toolbelt

Health v2 · maintenance only

Adoption not part of the score

7152 stars · 154 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

ts-toolbelt is a large TypeScript type utility library offering 200+ generic type functions for computing, transforming, and creating types. It works like lodash for the type system, providing advanced mapped, conditional, and recursive types for stronger type safety.

Use cases

• merge or intersect object types in TypeScript
• make selected properties of a type optional or readonly
• compute union and intersection types safely
• deeply type nested object transformations
• write type-safe utility functions with complex generics
• check type equality or assignability at compile time

When to choose

• you need advanced type-level operations beyond TypeScript's built-in utilities
• you want a well-tested, comprehensive collection of utility types
• you're building type-safe libraries or APIs with complex generics

When to avoid

• your project uses plain JavaScript without TypeScript
• you only need a handful of simple utility types and prefer zero dependencies
• your TypeScript version is older than 4.1

Facets

library · maturity stable

type-system developer-tools developer-tools programming-languages cross-platform typescript type-utilities type-safety utility-types npm-package nodejs

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