The missing standard library for TypeScript, for writing production-grade software.
Effect is the missing standard library for TypeScript, for writing production-grade software. Licensed under MIT, it is very popular in the JavaScript ecosystem with 7.2M weekly downloads.
Effect has an excellent overall health score of 85/100. Its strongest dimension is maintenance (100/100), while quality (50/100) is the area with most room for improvement. This package is well-maintained and actively used.
Effect-TS has emerged as the functional programming toolkit for TypeScript, superseding fp-ts. Downloads, mental models, error handling, concurrency, and whether the complexity is worth it.
2026-03-09T00:00:00.000ZEffect-TS vs fp-ts compared for functional programming in TypeScript. Learn about the fp-ts merger, Effect's fiber model, and when each approach makes sense in 2026.
2026-03-08T00:00:00.000Z