# mapEffect

Runs an Effect for each input and forwards its successful value to the sink.

## Signatures

```ts
export declare const mapEffect: {
    <B, A, E2, R2>(f: (b: B) => Effect.Effect<A, E2, R2>): <E, R>(sink: Sink<A, E | E2, R>) => Sink<B, E | E2, R | R2>;
    <A, E, R, B, E2, R2>(sink: Sink<A, E | E2, R>, f: (b: B) => Effect.Effect<A, E2, R2>): Sink<B, E | E2, R | R2>;
};
```

## Why

Consumer-side adaptation can use services and typed failure without creating an intermediate Fx.

## Ownership and lifetime

One transition Effect runs per callback invocation. Its success is forwarded once; its complete
failure Cause is sent to `onFailure`. Calls themselves are not serialized by this adapter, so
ordering follows the invoking producer. Services join the sink requirements; interruption is local
to each callback Effect.

## Examples

```ts
import { Effect } from "effect"
import * as Sink from "@typed/fx/Sink"
const numbers = Sink.mapEffect(Sink.make(Effect.logError, Effect.log), (text: string) =>
  Effect.succeed(Number(text)))
```