Effect-TS

Effect is a powerful TypeScript library for building robust, type-safe applications. It provides a functional effect system with typed errors, dependency injection, resource management, and concurrency primitives.

Why Effect?

Type-safe errors: Unlike Promise which loses error type information, Effect tracks errors in the type system with Effect<Success, Error, Requirements>.

Dependency injection: Services are declared explicitly using Context.Tag and provided via Layer, making dependencies visible in types.

Resource safety: Effect.acquireRelease ensures resources are always cleaned up, even on failure or interruption.

Composability: Effects compose naturally with pipe, Effect.gen generators, and combinators like Effect.all, Effect.flatMap.

Quick Reference