gigobyte/purify

Health v2 · maintenance only

Adoption not part of the score

1603 stars · 62 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Purify is a functional programming library for TypeScript providing algebraic data types like Maybe, Either, and Result, plus runtime type codecs. It is Fantasy Land conformant and emphasizes a practical, type-safe, developer-friendly API.

Use cases

• handle nullable values without null checks in TypeScript
• model success/failure results with Either or Result types
• validate and decode untrusted JSON at runtime with type-safe codecs
• write functional-style TypeScript with monads and functors
• avoid throwing exceptions by encoding errors in return types
• chain computations safely with map and chain methods

When to choose

• you want fp-ts-style functional patterns with a simpler, instance-method-based API
• you need runtime validation tightly integrated with TypeScript types
• you prefer a curated, practical FP library over a full port of another language's standard library

When to avoid

• you need higher-kinded types or advanced type-level FP features
• your team is not comfortable with functional programming concepts
• you want a point-free programming style out of the box

Facets

library · maturity active

serialization error-handling type-system programming-languages developer-tools web-development browser bun cross-platform functional-programming typescript algebraic-data-types maybe either monad fantasy-land runtime-validation codecs option-type result-type nodejs deno

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