<A extends Fiber<any, any>>(self: Iterable<A>): Effect<
Array<
Exit<
A extends Fiber<infer _A, infer _E> ? _A : never,
A extends Fiber<infer _A, infer _E> ? _E : never
>
>
>Waits for all fibers in the provided iterable to complete and returns an array of their exit values.
When to use
Use when you need every fiber outcome as data, including failures and interruptions.
Details
The returned array is ordered like the input iterable.
Gotchas
Failures are captured as Exit.Failure values. Use joinAll when you
want the first failed fiber to fail the returned Effect.
Example (Awaiting multiple fiber exits)
import { Effect, Fiber } from "effect"
const program = Effect.gen(function*() {
const fiber1 = yield* Effect.forkChild(Effect.succeed(1))
const fiber2 = yield* Effect.forkChild(Effect.succeed(2))
const exits = yield* Fiber.awaitAll([fiber1, fiber2])
console.log(exits) // [Exit.succeed(1), Exit.succeed(2)]
})export const const awaitAll: <
A extends Fiber<any, any>
>(
self: Iterable<A>
) => Effect<
Array<
Exit<
A extends Fiber<infer _A, infer _E>
? _A
: never,
A extends Fiber<infer _A, infer _E>
? _E
: never
>
>
>
Waits for all fibers in the provided iterable to complete and returns
an array of their exit values.
When to use
Use when you need every fiber outcome as data, including failures and
interruptions.
Details
The returned array is ordered like the input iterable.
Gotchas
Failures are captured as Exit.Failure values. Use
joinAll
when you
want the first failed fiber to fail the returned Effect.
Example (Awaiting multiple fiber exits)
import { Effect, Fiber } from "effect"
const program = Effect.gen(function*() {
const fiber1 = yield* Effect.forkChild(Effect.succeed(1))
const fiber2 = yield* Effect.forkChild(Effect.succeed(2))
const exits = yield* Fiber.awaitAll([fiber1, fiber2])
console.log(exits) // [Exit.succeed(1), Exit.succeed(2)]
})
awaitAll: <function (type parameter) A in <A extends Fiber<any, any>>(self: Iterable<A>): Effect<Array<Exit<A extends Fiber<infer _A, infer _E> ? _A : never, A extends Fiber<infer _A, infer _E> ? _E : never>>>A extends interface Fiber<out A, out E = never>A runtime fiber is a lightweight thread that executes Effects. Fibers are
the unit of concurrency in Effect. They provide a way to run multiple
Effects concurrently while maintaining structured concurrency and
cancellation safety.
When to use
Use to observe, join, interrupt, or coordinate work that has already been
forked.
Details
A fiber exposes both safe Effect-based operations, such as
await
,
join
, and
interrupt
, and low-level runtime fields used by
the scheduler and runtime internals.
Gotchas
Prefer the exported functions in this module over calling interruptUnsafe
or pollUnsafe directly. The unsafe methods are immediate runtime hooks and
do not provide the same Effect-based sequencing guarantees.
Example (Awaiting a forked fiber)
import { Effect, Fiber } from "effect"
const program = Effect.gen(function*() {
// Fork an effect to run in a new fiber
const fiber = yield* Effect.forkChild(Effect.succeed(42))
// Wait for the fiber to complete and get its result
const result = yield* Fiber.await(fiber)
console.log(result) // Exit.succeed(42)
return result
})
The Fiber namespace contains utility types and functions for working with fibers.
It provides type-level utilities for fiber operations and variance encoding.
When to use
Use to reference type-level helpers associated with Fiber.
Details
The namespace currently exposes type-level support used by the Fiber
interface. Runtime operations are exported as module-level functions.
Example (Working with fiber types)
import { Effect, Fiber } from "effect"
const program = Effect.gen(function*() {
// Create a fiber
const fiber = yield* Effect.forkChild(Effect.succeed(42))
// Use namespace types for variance
const typedFiber: Fiber.Fiber<number, never> = fiber
// Access fiber properties
console.log(`Fiber ID: ${fiber.id}`)
// Join the fiber
const result = yield* Fiber.join(fiber)
return result // 42
})
Fiber<any, any>>(
self: Iterable<A>self: interface Iterable<T, TReturn = any, TNext = any>Iterable<function (type parameter) A in <A extends Fiber<any, any>>(self: Iterable<A>): Effect<Array<Exit<A extends Fiber<infer _A, infer _E> ? _A : never, A extends Fiber<infer _A, infer _E> ? _E : never>>>A>
) => import EffectEffect<
interface Array<T>Array<
import ExitExit<
function (type parameter) A in <A extends Fiber<any, any>>(self: Iterable<A>): Effect<Array<Exit<A extends Fiber<infer _A, infer _E> ? _A : never, A extends Fiber<infer _A, infer _E> ? _E : never>>>A extends interface Fiber<out A, out E = never>A runtime fiber is a lightweight thread that executes Effects. Fibers are
the unit of concurrency in Effect. They provide a way to run multiple
Effects concurrently while maintaining structured concurrency and
cancellation safety.
When to use
Use to observe, join, interrupt, or coordinate work that has already been
forked.
Details
A fiber exposes both safe Effect-based operations, such as
await
,
join
, and
interrupt
, and low-level runtime fields used by
the scheduler and runtime internals.
Gotchas
Prefer the exported functions in this module over calling interruptUnsafe
or pollUnsafe directly. The unsafe methods are immediate runtime hooks and
do not provide the same Effect-based sequencing guarantees.
Example (Awaiting a forked fiber)
import { Effect, Fiber } from "effect"
const program = Effect.gen(function*() {
// Fork an effect to run in a new fiber
const fiber = yield* Effect.forkChild(Effect.succeed(42))
// Wait for the fiber to complete and get its result
const result = yield* Fiber.await(fiber)
console.log(result) // Exit.succeed(42)
return result
})
The Fiber namespace contains utility types and functions for working with fibers.
It provides type-level utilities for fiber operations and variance encoding.
When to use
Use to reference type-level helpers associated with Fiber.
Details
The namespace currently exposes type-level support used by the Fiber
interface. Runtime operations are exported as module-level functions.
Example (Working with fiber types)
import { Effect, Fiber } from "effect"
const program = Effect.gen(function*() {
// Create a fiber
const fiber = yield* Effect.forkChild(Effect.succeed(42))
// Use namespace types for variance
const typedFiber: Fiber.Fiber<number, never> = fiber
// Access fiber properties
console.log(`Fiber ID: ${fiber.id}`)
// Join the fiber
const result = yield* Fiber.join(fiber)
return result // 42
})
Fiber<infer function (type parameter) _A_A, infer function (type parameter) _E_E> ? function (type parameter) _A_A : never,
function (type parameter) A in <A extends Fiber<any, any>>(self: Iterable<A>): Effect<Array<Exit<A extends Fiber<infer _A, infer _E> ? _A : never, A extends Fiber<infer _A, infer _E> ? _E : never>>>A extends interface Fiber<out A, out E = never>A runtime fiber is a lightweight thread that executes Effects. Fibers are
the unit of concurrency in Effect. They provide a way to run multiple
Effects concurrently while maintaining structured concurrency and
cancellation safety.
When to use
Use to observe, join, interrupt, or coordinate work that has already been
forked.
Details
A fiber exposes both safe Effect-based operations, such as
await
,
join
, and
interrupt
, and low-level runtime fields used by
the scheduler and runtime internals.
Gotchas
Prefer the exported functions in this module over calling interruptUnsafe
or pollUnsafe directly. The unsafe methods are immediate runtime hooks and
do not provide the same Effect-based sequencing guarantees.
Example (Awaiting a forked fiber)
import { Effect, Fiber } from "effect"
const program = Effect.gen(function*() {
// Fork an effect to run in a new fiber
const fiber = yield* Effect.forkChild(Effect.succeed(42))
// Wait for the fiber to complete and get its result
const result = yield* Fiber.await(fiber)
console.log(result) // Exit.succeed(42)
return result
})
The Fiber namespace contains utility types and functions for working with fibers.
It provides type-level utilities for fiber operations and variance encoding.
When to use
Use to reference type-level helpers associated with Fiber.
Details
The namespace currently exposes type-level support used by the Fiber
interface. Runtime operations are exported as module-level functions.
Example (Working with fiber types)
import { Effect, Fiber } from "effect"
const program = Effect.gen(function*() {
// Create a fiber
const fiber = yield* Effect.forkChild(Effect.succeed(42))
// Use namespace types for variance
const typedFiber: Fiber.Fiber<number, never> = fiber
// Access fiber properties
console.log(`Fiber ID: ${fiber.id}`)
// Join the fiber
const result = yield* Fiber.join(fiber)
return result // 42
})
Fiber<infer function (type parameter) _A_A, infer function (type parameter) _E_E> ? function (type parameter) _E_E : never
>
>
> = import effecteffect.const fiberAwaitAll: <
Fiber extends Fiber.Fiber<any, any>
>(
self: Iterable<Fiber>
) => Effect.Effect<
Array<
Exit.Exit<
Fiber extends Fiber.Fiber<
infer _A,
infer _E
>
? _A
: never,
Fiber extends Fiber.Fiber<
infer _A,
infer _E
>
? _E
: never
>
>
>