消费流

在处理流时，了解如何消费它们产生的数据至关重要。在本指南中，我们将介绍几种消费流的常见方法。

使用 runCollect

要将流中的所有元素收集到单个 Chunk 中，您可以使用 Stream.runCollect 函数。

1
import { 
import Stream
Stream, 
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect } from "effect"
2

3
const 
const stream: Stream.Stream<number, never, never>
stream = 
import Stream
Stream.
const make: <[number, number, number, number, number]>(as_0: number, as_1: number, as_2: number, as_3: number, as_4: number) => Stream.Stream<number, never, never>
Creates a stream from an sequence of values.
@example 
import { Effect, Stream } from "effect"

const stream = Stream.make(1, 2, 3)

Effect.runPromise(Stream.runCollect(stream)).then(console.log)
// { _id: 'Chunk', values: [ 1, 2, 3 ] }
@since ― 2.0.0
make(1, 2, 3, 4, 5)
4

5
const 
const collectedData: Effect.Effect<Chunk<number>, never, never>
collectedData = 
import Stream
Stream.
const runCollect: <number, never, never>(self: Stream.Stream<number, never, never>) => Effect.Effect<Chunk<number>, never, never>
Runs the stream and collects all of its elements to a chunk.
@since ― 2.0.0
runCollect(
const stream: Stream.Stream<number, never, never>
stream)
6

7
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect.
const runPromise: <Chunk<number>, never>(effect: Effect.Effect<Chunk<number>, never, never>, options?: {
    readonly signal?: AbortSignal | undefined;
} | undefined) => Promise<Chunk<number>>
Executes an effect and returns the result as a Promise.
Details
This function runs an effect and converts its result into a Promise. If the
effect succeeds, the Promise will resolve with the successful result. If
the effect fails, the Promise will reject with an error, which includes the
failure details of the effect.
The optional options parameter allows you to pass an AbortSignal for
cancellation, enabling more fine-grained control over asynchronous tasks.
When to Use
Use this function when you need to execute an effect and work with its result
in a promise-based system, such as when integrating with third-party
libraries that expect Promise results.
Example (Running a Successful Effect as a Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.succeed(1)).then(console.log)
// Output: 1
Example (Handling a Failing Effect as a Rejected Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.fail("my error")).catch(console.error)
// Output:
// (FiberFailure) Error: my error
@see ― runPromiseExit for a version that returns an Exit type instead
of rejecting.
@since ― 2.0.0
runPromise(
const collectedData: Effect.Effect<Chunk<number>, never, never>
collectedData).
Promise<Chunk<number>>.then<void, never>(onfulfilled?: ((value: Chunk<number>) => void | PromiseLike<void>) | null | undefined, onrejected?: ((reason: any) => PromiseLike<never>) | null | undefined): Promise<void>
Attaches callbacks for the resolution and/or rejection of the Promise.
@param ― onfulfilled The callback to execute when the Promise is resolved.
@param ― onrejected The callback to execute when the Promise is rejected.
@returns ― A Promise for the completion of which ever callback is executed.
then(
var console: Console
The console module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.
The module exports two specific components:

A Console class with methods such as console.log(), console.error() and console.warn() that can be used to write to any Node.js stream.
A global console instance configured to write to process.stdout and
process.stderr. The global console can be used without importing the node:console module.

Warning: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the note on process I/O for
more information.
Example using the global console:
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
Example using the Console class:
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
@see ― source
console.
Console.log(message?: any, ...optionalParams: any[]): void
Prints to stdout with newline. Multiple arguments can be passed, with the
first used as the primary message and all additional used as substitution
values similar to printf(3)
(the arguments are all passed to util.format()).
const count = 5;
console.log('count: %d', count);
// Prints: count: 5, to stdout
console.log('count:', count);
// Prints: count: 5, to stdout
See util.format() for more information.
@since ― v0.1.100
log)
8
/*
9
输出：
10
{
11
  _id: "Chunk",
12
  values: [ 1, 2, 3, 4, 5 ]
13
}
14
*/

使用 runForEach

消费流元素的另一种方法是使用 Stream.runForEach。它接受一个回调函数，该函数接收流的每个元素。以下是一个示例：

1
import { 
import Stream
Stream, 
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect, 
import Console
Console } from "effect"
2

3
const 
const effect: Effect.Effect<void, never, never>
effect = 
import Stream
Stream.
const make: <[number, number, number]>(as_0: number, as_1: number, as_2: number) => Stream.Stream<number, never, never>
Creates a stream from an sequence of values.
@example 
import { Effect, Stream } from "effect"

const stream = Stream.make(1, 2, 3)

Effect.runPromise(Stream.runCollect(stream)).then(console.log)
// { _id: 'Chunk', values: [ 1, 2, 3 ] }
@since ― 2.0.0
make(1, 2, 3).
Pipeable.pipe<Stream.Stream<number, never, never>, Effect.Effect<void, never, never>>(this: Stream.Stream<number, never, never>, ab: (_: Stream.Stream<number, never, never>) => Effect.Effect<void, never, never>): Effect.Effect<void, never, never> (+21 overloads)
pipe(
4
  
import Stream
Stream.
const runForEach: <number, void, never, never>(f: (a: number) => Effect.Effect<void, never, never>) => <E, R>(self: Stream.Stream<number, E, R>) => Effect.Effect<void, E, R> (+1 overload)
Consumes all elements of the stream, passing them to the specified
callback.
@since ― 2.0.0
runForEach((
n: number
n) => 
import Console
Console.
const log: (...args: ReadonlyArray<any>) => Effect.Effect<void>@since ― 2.0.0
log(
n: number
n))
5
)
6

7
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect.
const runPromise: <void, never>(effect: Effect.Effect<void, never, never>, options?: {
    readonly signal?: AbortSignal | undefined;
} | undefined) => Promise<void>
Executes an effect and returns the result as a Promise.
Details
This function runs an effect and converts its result into a Promise. If the
effect succeeds, the Promise will resolve with the successful result. If
the effect fails, the Promise will reject with an error, which includes the
failure details of the effect.
The optional options parameter allows you to pass an AbortSignal for
cancellation, enabling more fine-grained control over asynchronous tasks.
When to Use
Use this function when you need to execute an effect and work with its result
in a promise-based system, such as when integrating with third-party
libraries that expect Promise results.
Example (Running a Successful Effect as a Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.succeed(1)).then(console.log)
// Output: 1
Example (Handling a Failing Effect as a Rejected Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.fail("my error")).catch(console.error)
// Output:
// (FiberFailure) Error: my error
@see ― runPromiseExit for a version that returns an Exit type instead
of rejecting.
@since ― 2.0.0
runPromise(
const effect: Effect.Effect<void, never, never>
effect).
Promise<void>.then<void, never>(onfulfilled?: ((value: void) => void | PromiseLike<void>) | null | undefined, onrejected?: ((reason: any) => PromiseLike<never>) | null | undefined): Promise<void>
Attaches callbacks for the resolution and/or rejection of the Promise.
@param ― onfulfilled The callback to execute when the Promise is resolved.
@param ― onrejected The callback to execute when the Promise is rejected.
@returns ― A Promise for the completion of which ever callback is executed.
then(
var console: Console
The console module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.
The module exports two specific components:

A Console class with methods such as console.log(), console.error() and console.warn() that can be used to write to any Node.js stream.
A global console instance configured to write to process.stdout and
process.stderr. The global console can be used without importing the node:console module.

Warning: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the note on process I/O for
more information.
Example using the global console:
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
Example using the Console class:
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
@see ― source
console.
globalThis.Console.log(message?: any, ...optionalParams: any[]): void
Prints to stdout with newline. Multiple arguments can be passed, with the
first used as the primary message and all additional used as substitution
values similar to printf(3)
(the arguments are all passed to util.format()).
const count = 5;
console.log('count: %d', count);
// Prints: count: 5, to stdout
console.log('count:', count);
// Prints: count: 5, to stdout
See util.format() for more information.
@since ― v0.1.100
log)
8
/*
9
输出：
10
1
11
2
12
3
13
undefined
14
*/

在此示例中，我们使用 Stream.runForEach 将每个元素记录到控制台。

使用折叠操作

Stream.fold 函数是通过对值流执行折叠操作并返回包含结果的 effect 来消费流的另一种方法。以下是几个示例：

1
import { 
import Stream
Stream, 
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect } from "effect"
2

3
const 
const foldedStream: Effect.Effect<number, never, never>
foldedStream = 
import Stream
Stream.
const make: <[number, number, number, number, number]>(as_0: number, as_1: number, as_2: number, as_3: number, as_4: number) => Stream.Stream<number, never, never>
Creates a stream from an sequence of values.
@example 
import { Effect, Stream } from "effect"

const stream = Stream.make(1, 2, 3)

Effect.runPromise(Stream.runCollect(stream)).then(console.log)
// { _id: 'Chunk', values: [ 1, 2, 3 ] }
@since ― 2.0.0
make(1, 2, 3, 4, 5).
Pipeable.pipe<Stream.Stream<number, never, never>, Effect.Effect<number, never, never>>(this: Stream.Stream<number, never, never>, ab: (_: Stream.Stream<number, never, never>) => Effect.Effect<number, never, never>): Effect.Effect<number, never, never> (+21 overloads)
pipe(
4
  
import Stream
Stream.
const runFold: <number, number>(s: number, f: (s: number, a: number) => number) => <E, R>(self: Stream.Stream<number, E, R>) => Effect.Effect<number, E, R> (+1 overload)
Executes a pure fold over the stream of values - reduces all elements in
the stream to a value of type S.
@since ― 2.0.0
runFold(0, (
a: number
a, 
b: number
b) => 
a: number
a + 
b: number
b)
5
)
6

7
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect.
const runPromise: <number, never>(effect: Effect.Effect<number, never, never>, options?: {
    readonly signal?: AbortSignal | undefined;
} | undefined) => Promise<number>
Executes an effect and returns the result as a Promise.
Details
This function runs an effect and converts its result into a Promise. If the
effect succeeds, the Promise will resolve with the successful result. If
the effect fails, the Promise will reject with an error, which includes the
failure details of the effect.
The optional options parameter allows you to pass an AbortSignal for
cancellation, enabling more fine-grained control over asynchronous tasks.
When to Use
Use this function when you need to execute an effect and work with its result
in a promise-based system, such as when integrating with third-party
libraries that expect Promise results.
Example (Running a Successful Effect as a Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.succeed(1)).then(console.log)
// Output: 1
Example (Handling a Failing Effect as a Rejected Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.fail("my error")).catch(console.error)
// Output:
// (FiberFailure) Error: my error
@see ― runPromiseExit for a version that returns an Exit type instead
of rejecting.
@since ― 2.0.0
runPromise(
const foldedStream: Effect.Effect<number, never, never>
foldedStream).
Promise<number>.then<void, never>(onfulfilled?: ((value: number) => void | PromiseLike<void>) | null | undefined, onrejected?: ((reason: any) => PromiseLike<never>) | null | undefined): Promise<void>
Attaches callbacks for the resolution and/or rejection of the Promise.
@param ― onfulfilled The callback to execute when the Promise is resolved.
@param ― onrejected The callback to execute when the Promise is rejected.
@returns ― A Promise for the completion of which ever callback is executed.
then(
var console: Console
The console module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.
The module exports two specific components:

A Console class with methods such as console.log(), console.error() and console.warn() that can be used to write to any Node.js stream.
A global console instance configured to write to process.stdout and
process.stderr. The global console can be used without importing the node:console module.

Warning: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the note on process I/O for
more information.
Example using the global console:
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
Example using the Console class:
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
@see ― source
console.
Console.log(message?: any, ...optionalParams: any[]): void
Prints to stdout with newline. Multiple arguments can be passed, with the
first used as the primary message and all additional used as substitution
values similar to printf(3)
(the arguments are all passed to util.format()).
const count = 5;
console.log('count: %d', count);
// Prints: count: 5, to stdout
console.log('count:', count);
// Prints: count: 5, to stdout
See util.format() for more information.
@since ― v0.1.100
log)
8
// 输出：15
9

10
const 
const foldedWhileStream: Effect.Effect<number, never, never>
foldedWhileStream = 
import Stream
Stream.
const make: <[number, number, number, number, number]>(as_0: number, as_1: number, as_2: number, as_3: number, as_4: number) => Stream.Stream<number, never, never>
Creates a stream from an sequence of values.
@example 
import { Effect, Stream } from "effect"

const stream = Stream.make(1, 2, 3)

Effect.runPromise(Stream.runCollect(stream)).then(console.log)
// { _id: 'Chunk', values: [ 1, 2, 3 ] }
@since ― 2.0.0
make(1, 2, 3, 4, 5).
Pipeable.pipe<Stream.Stream<number, never, never>, Effect.Effect<number, never, never>>(this: Stream.Stream<number, never, never>, ab: (_: Stream.Stream<number, never, never>) => Effect.Effect<number, never, never>): Effect.Effect<number, never, never> (+21 overloads)
pipe(
11
  
import Stream
Stream.
const runFoldWhile: <number, number>(s: number, cont: Predicate<number>, f: (s: number, a: number) => number) => <E, R>(self: Stream.Stream<number, E, R>) => Effect.Effect<number, E, R> (+1 overload)
Reduces the elements in the stream to a value of type S. Stops the fold
early when the condition is not fulfilled. Example:
@since ― 2.0.0
runFoldWhile(
12
    0,
13
    (
n: number
n) => 
n: number
n <= 3,
14
    (
a: number
a, 
b: number
b) => 
a: number
a + 
b: number
b
15
  )
16
)
17

18
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect.
const runPromise: <number, never>(effect: Effect.Effect<number, never, never>, options?: {
    readonly signal?: AbortSignal | undefined;
} | undefined) => Promise<number>
Executes an effect and returns the result as a Promise.
Details
This function runs an effect and converts its result into a Promise. If the
effect succeeds, the Promise will resolve with the successful result. If
the effect fails, the Promise will reject with an error, which includes the
failure details of the effect.
The optional options parameter allows you to pass an AbortSignal for
cancellation, enabling more fine-grained control over asynchronous tasks.
When to Use
Use this function when you need to execute an effect and work with its result
in a promise-based system, such as when integrating with third-party
libraries that expect Promise results.
Example (Running a Successful Effect as a Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.succeed(1)).then(console.log)
// Output: 1
Example (Handling a Failing Effect as a Rejected Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.fail("my error")).catch(console.error)
// Output:
// (FiberFailure) Error: my error
@see ― runPromiseExit for a version that returns an Exit type instead
of rejecting.
@since ― 2.0.0
runPromise(
const foldedWhileStream: Effect.Effect<number, never, never>
foldedWhileStream).
Promise<number>.then<void, never>(onfulfilled?: ((value: number) => void | PromiseLike<void>) | null | undefined, onrejected?: ((reason: any) => PromiseLike<never>) | null | undefined): Promise<void>
Attaches callbacks for the resolution and/or rejection of the Promise.
@param ― onfulfilled The callback to execute when the Promise is resolved.
@param ― onrejected The callback to execute when the Promise is rejected.
@returns ― A Promise for the completion of which ever callback is executed.
then(
var console: Console
The console module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.
The module exports two specific components:

A Console class with methods such as console.log(), console.error() and console.warn() that can be used to write to any Node.js stream.
A global console instance configured to write to process.stdout and
process.stderr. The global console can be used without importing the node:console module.

Warning: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the note on process I/O for
more information.
Example using the global console:
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
Example using the Console class:
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
@see ― source
console.
Console.log(message?: any, ...optionalParams: any[]): void
Prints to stdout with newline. Multiple arguments can be passed, with the
first used as the primary message and all additional used as substitution
values similar to printf(3)
(the arguments are all passed to util.format()).
const count = 5;
console.log('count: %d', count);
// Prints: count: 5, to stdout
console.log('count:', count);
// Prints: count: 5, to stdout
See util.format() for more information.
@since ― v0.1.100
log)
19
// 输出：6

在第一个示例（foldedStream）中，我们使用 Stream.runFold 计算所有元素的总和。在第二个示例（foldedWhileStream）中，我们使用 Stream.runFoldWhile 计算总和，但只计算到满足特定条件为止。

使用汇

要使用汇消费流，您可以将 Sink 传递给 Stream.run 函数。以下是一个示例：

1
import { 
import Stream
Stream, 
import Sink
Sink, 
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect } from "effect"
2

3
const 
const effect: Effect.Effect<number, never, never>
effect = 
import Stream
Stream.
const make: <[number, number, number]>(as_0: number, as_1: number, as_2: number) => Stream.Stream<number, never, never>
Creates a stream from an sequence of values.
@example 
import { Effect, Stream } from "effect"

const stream = Stream.make(1, 2, 3)

Effect.runPromise(Stream.runCollect(stream)).then(console.log)
// { _id: 'Chunk', values: [ 1, 2, 3 ] }
@since ― 2.0.0
make(1, 2, 3).
Pipeable.pipe<Stream.Stream<number, never, never>, Effect.Effect<number, never, never>>(this: Stream.Stream<number, never, never>, ab: (_: Stream.Stream<number, never, never>) => Effect.Effect<number, never, never>): Effect.Effect<number, never, never> (+21 overloads)
pipe(
import Stream
Stream.
const run: <number, number, never, never>(sink: Sink.Sink<number, number, unknown, never, never>) => <E, R>(self: Stream.Stream<number, E, R>) => Effect.Effect<number, E, Exclude<R, Scope>> (+1 overload)
Runs the sink on the stream to produce either the sink's result or an error.
@since ― 2.0.0
run(
import Sink
Sink.
const sum: Sink.Sink<number, number, never, never, never>
A sink that sums incoming numeric values.
@since ― 2.0.0
sum))
4

5
import Effect@since ― 2.0.0
@since ― 2.0.0
@since ― 2.0.0
Effect.
const runPromise: <number, never>(effect: Effect.Effect<number, never, never>, options?: {
    readonly signal?: AbortSignal | undefined;
} | undefined) => Promise<number>
Executes an effect and returns the result as a Promise.
Details
This function runs an effect and converts its result into a Promise. If the
effect succeeds, the Promise will resolve with the successful result. If
the effect fails, the Promise will reject with an error, which includes the
failure details of the effect.
The optional options parameter allows you to pass an AbortSignal for
cancellation, enabling more fine-grained control over asynchronous tasks.
When to Use
Use this function when you need to execute an effect and work with its result
in a promise-based system, such as when integrating with third-party
libraries that expect Promise results.
Example (Running a Successful Effect as a Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.succeed(1)).then(console.log)
// Output: 1
Example (Handling a Failing Effect as a Rejected Promise)
import { Effect } from "effect"

Effect.runPromise(Effect.fail("my error")).catch(console.error)
// Output:
// (FiberFailure) Error: my error
@see ― runPromiseExit for a version that returns an Exit type instead
of rejecting.
@since ― 2.0.0
runPromise(
const effect: Effect.Effect<number, never, never>
effect).
Promise<number>.then<void, never>(onfulfilled?: ((value: number) => void | PromiseLike<void>) | null | undefined, onrejected?: ((reason: any) => PromiseLike<never>) | null | undefined): Promise<void>
Attaches callbacks for the resolution and/or rejection of the Promise.
@param ― onfulfilled The callback to execute when the Promise is resolved.
@param ― onrejected The callback to execute when the Promise is rejected.
@returns ― A Promise for the completion of which ever callback is executed.
then(
var console: Console
The console module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.
The module exports two specific components:

A Console class with methods such as console.log(), console.error() and console.warn() that can be used to write to any Node.js stream.
A global console instance configured to write to process.stdout and
process.stderr. The global console can be used without importing the node:console module.

Warning: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the note on process I/O for
more information.
Example using the global console:
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
Example using the Console class:
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
@see ― source
console.
Console.log(message?: any, ...optionalParams: any[]): void
Prints to stdout with newline. Multiple arguments can be passed, with the
first used as the primary message and all additional used as substitution
values similar to printf(3)
(the arguments are all passed to util.format()).
const count = 5;
console.log('count: %d', count);
// Prints: count: 5, to stdout
console.log('count:', count);
// Prints: count: 5, to stdout
See util.format() for more information.
@since ― v0.1.100
log)
6
// 输出：6

在此示例中，我们使用 Sink 计算流中元素的总和。