effect-io-ai

Package: effect
Module: Stream

Stream.tapSink

Runs a sink for all stream elements while still emitting them downstream.

Example (Tapping values with a sink)

import { Console, Effect, Ref, Sink, Stream } from "effect"

const program = Effect.gen(function*() {
  const seen = yield* Ref.make<Array<number>>([])
  const sink = Sink.forEach((value: number) =>
    Ref.update(seen, (items) => [...items, value])
  )
  const result = yield* Stream.make(1, 2, 3).pipe(
    Stream.tapSink(sink),
    Stream.runCollect
  )
  const tapped = yield* Ref.get(seen)
  yield* Console.log(tapped)
  yield* Console.log(result)
})

Effect.runPromise(program)
// Output: [1, 2, 3]
// Output: [1, 2, 3]

Signature

declare const tapSink: { <A, E2, R2>(sink: Sink.Sink<unknown, A, unknown, E2, R2>): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>; <A, E, R, E2, R2>(self: Stream<A, E, R>, sink: Sink.Sink<unknown, A, unknown, E2, R2>): Stream<A, E | E2, R | R2>; }

Source

Since v2.0.0