<A extends Iterable<Fiber<any, any>>>(self: A): Effect<
Arr.ReadonlyArray.With<
A,
A extends Iterable<Fiber<infer _A, infer _E>> ? _A : never
>,
A extends Fiber<infer _A, infer _E> ? _E : never
>Waits for all fibers to succeed and returns their values in input order.
When to use
Use when you need every fiber to succeed and want the successful values
rather than the Exit values.
Details
If any fiber fails, the returned Effect fails with that fiber's cause and
stops waiting for additional results. This does not interrupt the remaining
fibers.
Gotchas
A failure stops waiting, but it does not interrupt any other fibers. Use interruptAll separately when remaining fibers should be stopped.
export const const joinAll: <
A extends Iterable<Fiber<any, any>>
>(
self: A
) => Effect<
Arr.ReadonlyArray.With<
A,
A extends Iterable<Fiber<infer _A, infer _E>>
? _A
: never
>,
A extends Fiber<infer _A, infer _E> ? _E : never
>
Waits for all fibers to succeed and returns their values in input order.
When to use
Use when you need every fiber to succeed and want the successful values
rather than the Exit values.
Details
If any fiber fails, the returned Effect fails with that fiber's cause and
stops waiting for additional results. This does not interrupt the remaining
fibers.
Gotchas
A failure stops waiting, but it does not interrupt any other fibers. Use
interruptAll
separately when remaining fibers should be stopped.
joinAll: <function (type parameter) A in <A extends Iterable<Fiber<any, any>>>(self: A): Effect<Arr.ReadonlyArray.With<A, A extends Iterable<Fiber<infer _A, infer _E>> ? _A : never>, A extends Fiber<infer _A, infer _E> ? _E : never>A extends interface Iterable<T, TReturn = any, TNext = any>Iterable<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: A extends Iterable<Fiber<any, any>>self: function (type parameter) A in <A extends Iterable<Fiber<any, any>>>(self: A): Effect<Arr.ReadonlyArray.With<A, A extends Iterable<Fiber<infer _A, infer _E>> ? _A : never>, A extends Fiber<infer _A, infer _E> ? _E : never>A
) => import EffectEffect<
import ArrArr.declareReadonlyArray.type Arr.ReadonlyArray.With = /*unresolved*/ anyWith<
function (type parameter) A in <A extends Iterable<Fiber<any, any>>>(self: A): Effect<Arr.ReadonlyArray.With<A, A extends Iterable<Fiber<infer _A, infer _E>> ? _A : never>, A extends Fiber<infer _A, infer _E> ? _E : never>A,
function (type parameter) A in <A extends Iterable<Fiber<any, any>>>(self: A): Effect<Arr.ReadonlyArray.With<A, A extends Iterable<Fiber<infer _A, infer _E>> ? _A : never>, A extends Fiber<infer _A, infer _E> ? _E : never>A extends interface Iterable<T, TReturn = any, TNext = any>Iterable<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 Iterable<Fiber<any, any>>>(self: A): Effect<Arr.ReadonlyArray.With<A, A extends Iterable<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 fiberJoinAll: <
A extends Iterable<Fiber.Fiber<any, any>>
>(
self: A
) => Effect.Effect<
Arr.ReadonlyArray.With<
A,
A extends Iterable<
Fiber.Fiber<infer _A, infer _E>
>
? _A
: never
>,
A extends Fiber.Fiber<infer _A, infer _E>
? _E
: never
>