| Feature | fp-ts (Task/TaskEither) | Effect |
|---|---|---|
| Async primitive | Task<A> = () => Promise<A> (lazy) |
Effect<Out, Err, Req> (runnable via runPromise, etc.) |
| Error channel | TaskEither<E, A> = () => Promise<Either<E, A>> |
Dedicated error channel in Effect<Out, Err, Req> |
| Exception wrapping | tryCatch wraps thrown/rejected Promises into Left<E> |
Effect.try / Effect.tryPromise wrap sync/async functions |
| Composition | pipe, chain, map, fold on TaskEither |
.pipe(Effect.map, Effect.chain, Effect.catchAll, …) |
| Concurrency | No built-in fibers; manual via Promise.all |
First-class fibers with safe cancellation (Effect.fork) |
| Retry / Backoff | No built-in support; manual retries | Schedule library offers retry policies out of the box |
| Resource safety (bracketing) | Manual try/finally around Task or TaskEither |
Effect.acquireRelease / Effect.bracket for cleanup |
| Dependency injection & layers | None (custom Context needed) | Built-in Context and Layer modules |
| Bundle size | Very small; type-level constructs, tree-shakeable | Larger core runtime plus optional modules; tree-shakeable |
| Learning curve | Steep for HKTs and FP type classes | Steeper initial investment, but consistent for large systems |
Created
July 3, 2025 12:04
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