<A, X, EX, RX>(
onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>
): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>
<A, E, R, X, EX, RX>(
self: Stream<A, E, R>,
onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>
): Stream<A, E | EX, R | RX>Runs the provided effect with the first element emitted by the stream.
Example (Running an effect on the first value)
import { Console, Effect, Stream } from "effect"
Effect.runPromise(Effect.gen(function* () {
yield* Stream.fromArray([1, 2, 3]).pipe(
Stream.onFirst((value) => Console.log(`first=${value}`)),
Stream.runDrain
)
}))
// Output: first=1export const const onFirst: {
<A, X, EX, RX>(
onFirst: (
element: NoInfer<A>
) => Effect.Effect<X, EX, RX>
): <E, R>(
self: Stream<A, E, R>
) => Stream<A, E | EX, R | RX>
<A, E, R, X, EX, RX>(
self: Stream<A, E, R>,
onFirst: (
element: NoInfer<A>
) => Effect.Effect<X, EX, RX>
): Stream<A, E | EX, R | RX>
}
Runs the provided effect with the first element emitted by the stream.
Example (Running an effect on the first value)
import { Console, Effect, Stream } from "effect"
Effect.runPromise(Effect.gen(function* () {
yield* Stream.fromArray([1, 2, 3]).pipe(
Stream.onFirst((value) => Console.log(`first=${value}`)),
Stream.runDrain
)
}))
// Output: first=1
onFirst: {
<function (type parameter) A in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>A, function (type parameter) X in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>X, function (type parameter) EX in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>EX, function (type parameter) RX in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>RX>(
onFirst: (
element: NoInfer<A>
) => Effect.Effect<X, EX, RX>
element: NoInfer<A>element: type NoInfer<A> = [A][A extends any ? 0 : never]Prevents TypeScript from inferring a type parameter from a specific
position.
When to use
Use when a function parameter must match an inferred type without becoming
an inference source.
Details
The parameter using NoInfer must still match the inferred type.
Example (Controlling inference)
import type { Types } from "effect"
declare function withDefault<T>(value: T, fallback: Types.NoInfer<T>): T
// T is inferred as "a" | "b" from the first argument only
const result = withDefault<"a" | "b">("a", "b")
NoInfer<function (type parameter) A in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>A>) => import EffectEffect.interface Effect<out A, out E = never, out R = never>The Effect interface defines a value that lazily describes a workflow or
job. The workflow requires some context R, and may fail with an error of
type E, or succeed with a value of type A.
When to use
Use when you need to represent a lazy, composable workflow that can require
services, fail with a typed error, or succeed with a typed value.
Details
Effect values model resourceful interaction with the outside world,
including synchronous, asynchronous, concurrent, and parallel interaction.
They use a fiber-based concurrency model, with built-in support for
scheduling, fine-grained interruption, structured concurrency, and high
scalability.
To run an Effect value, you need a Runtime, which is a type that is
capable of executing Effect values.
Effect<function (type parameter) X in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>X, function (type parameter) EX in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>EX, function (type parameter) RX in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>RX>
): <function (type parameter) E in <E, R>(self: Stream<A, E, R>): Stream<A, E | EX, R | RX>E, function (type parameter) R in <E, R>(self: Stream<A, E, R>): Stream<A, E | EX, R | RX>R>(self: Stream<A, E, R>(parameter) self: {
channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>A, function (type parameter) E in <E, R>(self: Stream<A, E, R>): Stream<A, E | EX, R | RX>E, function (type parameter) R in <E, R>(self: Stream<A, E, R>): Stream<A, E | EX, R | RX>R>) => interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>A, function (type parameter) E in <E, R>(self: Stream<A, E, R>): Stream<A, E | EX, R | RX>E | function (type parameter) EX in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>EX, function (type parameter) R in <E, R>(self: Stream<A, E, R>): Stream<A, E | EX, R | RX>R | function (type parameter) RX in <A, X, EX, RX>(onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): <E, R>(self: Stream<A, E, R>) => Stream<A, E | EX, R | RX>RX>
<function (type parameter) A in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>A, function (type parameter) E in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>E, function (type parameter) R in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>R, function (type parameter) X in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>X, function (type parameter) EX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>EX, function (type parameter) RX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>RX>(
self: Stream<A, E, R>(parameter) self: {
channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>A, function (type parameter) E in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>E, function (type parameter) R in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>R>,
onFirst: (
element: NoInfer<A>
) => Effect.Effect<X, EX, RX>
element: NoInfer<A>element: type NoInfer<A> = [A][A extends any ? 0 : never]Prevents TypeScript from inferring a type parameter from a specific
position.
When to use
Use when a function parameter must match an inferred type without becoming
an inference source.
Details
The parameter using NoInfer must still match the inferred type.
Example (Controlling inference)
import type { Types } from "effect"
declare function withDefault<T>(value: T, fallback: Types.NoInfer<T>): T
// T is inferred as "a" | "b" from the first argument only
const result = withDefault<"a" | "b">("a", "b")
NoInfer<function (type parameter) A in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>A>) => import EffectEffect.interface Effect<out A, out E = never, out R = never>The Effect interface defines a value that lazily describes a workflow or
job. The workflow requires some context R, and may fail with an error of
type E, or succeed with a value of type A.
When to use
Use when you need to represent a lazy, composable workflow that can require
services, fail with a typed error, or succeed with a typed value.
Details
Effect values model resourceful interaction with the outside world,
including synchronous, asynchronous, concurrent, and parallel interaction.
They use a fiber-based concurrency model, with built-in support for
scheduling, fine-grained interruption, structured concurrency, and high
scalability.
To run an Effect value, you need a Runtime, which is a type that is
capable of executing Effect values.
Effect<function (type parameter) X in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>X, function (type parameter) EX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>EX, function (type parameter) RX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>RX>
): interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>A, function (type parameter) E in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>E | function (type parameter) EX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>EX, function (type parameter) R in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>R | function (type parameter) RX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>RX>
} = dual<(...args: Array<any>) => any, <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>) => Stream<A, E | EX, R | RX>>(arity: 2, body: <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>) => Stream<A, E | EX, R | RX>): ((...args: Array<any>) => any) & (<A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>) => Stream<A, E | EX, R | RX>) (+1 overload)Creates a function that can be called in data-first style or data-last
(pipe-friendly) style.
When to use
Use to expose one implementation through both direct and pipe-friendly
call styles.
Details
Pass either the arity of the uncurried function or a predicate that decides
whether the current call is data-first. Arity is the common case. Use a
predicate when optional arguments make arity ambiguous.
Example (Selecting data-first or data-last style by arity)
import { Function, pipe } from "effect"
const sum = Function.dual<
(that: number) => (self: number) => number,
(self: number, that: number) => number
>(2, (self, that) => self + that)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
Example (Defining overloads with call signatures)
import { Function, pipe } from "effect"
const sum: {
(that: number): (self: number) => number
(self: number, that: number): number
} = Function.dual(2, (self: number, that: number): number => self + that)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
Example (Selecting data-first or data-last style with a predicate)
import { Function, pipe } from "effect"
const sum = Function.dual<
(that: number) => (self: number) => number,
(self: number, that: number) => number
>(
(args) => args.length === 2,
(self, that) => self + that
)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
dual(2, <function (type parameter) A in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>A, function (type parameter) E in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>E, function (type parameter) R in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>R, function (type parameter) X in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>X, function (type parameter) EX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>EX, function (type parameter) RX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>RX>(
self: Stream<A, E, R>(parameter) self: {
channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>A, function (type parameter) E in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>E, function (type parameter) R in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>R>,
onFirst: (
element: NoInfer<A>
) => Effect.Effect<X, EX, RX>
element: NoInfer<A>element: type NoInfer<A> = [A][A extends any ? 0 : never]Prevents TypeScript from inferring a type parameter from a specific
position.
When to use
Use when a function parameter must match an inferred type without becoming
an inference source.
Details
The parameter using NoInfer must still match the inferred type.
Example (Controlling inference)
import type { Types } from "effect"
declare function withDefault<T>(value: T, fallback: Types.NoInfer<T>): T
// T is inferred as "a" | "b" from the first argument only
const result = withDefault<"a" | "b">("a", "b")
NoInfer<function (type parameter) A in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>A>) => import EffectEffect.interface Effect<out A, out E = never, out R = never>The Effect interface defines a value that lazily describes a workflow or
job. The workflow requires some context R, and may fail with an error of
type E, or succeed with a value of type A.
When to use
Use when you need to represent a lazy, composable workflow that can require
services, fail with a typed error, or succeed with a typed value.
Details
Effect values model resourceful interaction with the outside world,
including synchronous, asynchronous, concurrent, and parallel interaction.
They use a fiber-based concurrency model, with built-in support for
scheduling, fine-grained interruption, structured concurrency, and high
scalability.
To run an Effect value, you need a Runtime, which is a type that is
capable of executing Effect values.
Effect<function (type parameter) X in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>X, function (type parameter) EX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>EX, function (type parameter) RX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>RX>
): interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>A, function (type parameter) E in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>E | function (type parameter) EX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>EX, function (type parameter) R in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>R | function (type parameter) RX in <A, E, R, X, EX, RX>(self: Stream<A, E, R>, onFirst: (element: NoInfer<A>) => Effect.Effect<X, EX, RX>): Stream<A, E | EX, R | RX>RX> => const fromChannel: <
Arr extends Arr.NonEmptyReadonlyArray<any>,
E,
R
>(
channel: Channel.Channel<
Arr,
E,
void,
unknown,
unknown,
unknown,
R
>
) => Stream<
Arr extends Arr.NonEmptyReadonlyArray<infer A>
? A
: never,
E,
R
>
Creates a stream from a array-emitting Channel.
Example (Creating a stream from an array-emitting channel)
import { Channel, Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
const channel = Channel.succeed([1, 2, 3] as const)
const stream = Stream.fromChannel(channel)
const result = yield* Stream.runCollect(stream)
yield* Console.log(result)
})
// Output: [ 1, 2, 3 ]
fromChannel(import ChannelChannel.const onFirst: {
<OutElem, A, E, R>(
onFirst: (
element: Types.NoInfer<OutElem>
) => Effect.Effect<A, E, R>
): <
OutErr,
OutDone,
InElem,
InErr,
InDone,
Env
>(
self: Channel<
OutElem,
OutErr,
OutDone,
InElem,
InErr,
InDone,
Env
>
) => Channel<
OutElem,
OutErr | E,
OutDone,
InElem,
InErr,
InDone,
Env | R
>
<
OutElem,
OutErr,
OutDone,
InElem,
InErr,
InDone,
Env,
A,
E,
R
>(
self: Channel<
OutElem,
OutErr,
OutDone,
InElem,
InErr,
InDone,
Env
>,
onFirst: (
element: Types.NoInfer<OutElem>
) => Effect.Effect<A, E, R>
): Channel<
OutElem,
OutErr | E,
OutDone,
InElem,
InErr,
InDone,
Env | R
>
}
self: Stream<A, E, R>(parameter) self: {
channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
Stream<A, E, R>.channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>(property) Stream<A, E, R>.channel: {
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
arr: readonly [A, ...A[]](parameter) arr: {
0: A;
length: number;
toString: () => string;
toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string };
concat: { (...items: Array<ConcatArray<A>>): Array<A>; (...items: Array<A | ConcatArray<A>>): Array<A> };
join: (separator?: string) => string;
slice: (start?: number, end?: number) => Array<A>;
indexOf: (searchElement: A, fromIndex?: number) => number;
lastIndexOf: (searchElement: A, fromIndex?: number) => number;
every: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): this is readonly S[]; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): boolean };
some: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => boolean;
forEach: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => void, thisArg?: any) => void;
map: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => U, thisArg?: any) => Array<U>;
filter: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): Array<S>; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): Array<A> };
reduce: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
reduceRight: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
find: { (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findIndex: (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
entries: () => ArrayIterator<[number, A]>;
keys: () => ArrayIterator<number>;
values: () => ArrayIterator<A>;
includes: (searchElement: A, fromIndex?: number) => boolean;
flatMap: (callback: (this: This, value: A, index: number, array: Array<A>) => U | ReadonlyArray<U>, thisArg?: This | undefined) => Array<U>;
flat: (this: A, depth?: D | undefined) => Array<FlatArray<A, D>>;
at: (index: number) => A | undefined;
findLast: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findLastIndex: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
toReversed: () => Array<A>;
toSorted: (compareFn?: ((a: A, b: A) => number) | undefined) => Array<A>;
toSpliced: { (start: number, deleteCount: number, ...items: Array<A>): Array<A>; (start: number, deleteCount?: number): Array<A> };
with: (index: number, value: A) => Array<A>;
}
onFirst: (
element: NoInfer<A>
) => Effect.Effect<X, EX, RX>
arr: readonly [A, ...A[]](parameter) arr: {
0: A;
length: number;
toString: () => string;
toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string };
concat: { (...items: Array<ConcatArray<A>>): Array<A>; (...items: Array<A | ConcatArray<A>>): Array<A> };
join: (separator?: string) => string;
slice: (start?: number, end?: number) => Array<A>;
indexOf: (searchElement: A, fromIndex?: number) => number;
lastIndexOf: (searchElement: A, fromIndex?: number) => number;
every: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): this is readonly S[]; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): boolean };
some: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => boolean;
forEach: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => void, thisArg?: any) => void;
map: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => U, thisArg?: any) => Array<U>;
filter: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): Array<S>; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): Array<A> };
reduce: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
reduceRight: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
find: { (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findIndex: (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
entries: () => ArrayIterator<[number, A]>;
keys: () => ArrayIterator<number>;
values: () => ArrayIterator<A>;
includes: (searchElement: A, fromIndex?: number) => boolean;
flatMap: (callback: (this: This, value: A, index: number, array: Array<A>) => U | ReadonlyArray<U>, thisArg?: This | undefined) => Array<U>;
flat: (this: A, depth?: D | undefined) => Array<FlatArray<A, D>>;
at: (index: number) => A | undefined;
findLast: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findLastIndex: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
toReversed: () => Array<A>;
toSorted: (compareFn?: ((a: A, b: A) => number) | undefined) => Array<A>;
toSpliced: { (start: number, deleteCount: number, ...items: Array<A>): Array<A>; (start: number, deleteCount?: number): Array<A> };
with: (index: number, value: A) => Array<A>;
}