Concurrency in Effect

Overview

Effect provides lightweight fiber-based concurrency:

• Fibers - Lightweight threads managed by Effect runtime
• Structured concurrency - Parent fibers supervise children
• Safe interruption - Clean cancellation with resource cleanup
• Concurrent primitives - Queue, Deferred, Semaphore, PubSub

Basic Parallel Execution

Effect.all with Concurrency

import { Effect } from "effect";

const results = yield * Effect.all([fetchUser(1), fetchUser(2), fetchUser(3)], { concurrency: "unbounded" });