# Sink.mapInputEffect

Alias for `mapEffect`, named for the input-side direction of the effectful transformation.

## Signatures

```ts
export declare const mapInputEffect: {
    <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

The name highlights that Sink composition is contravariant in successful input.

## Ownership and lifetime

It is exactly `mapEffect`: one Effect per input, with the same failures, services, ordering, and
interruption behavior.

## Examples

```ts
import { Effect } from "effect"
import * as Sink from "@typed/fx/Sink"
const sink = Sink.mapInputEffect(Sink.make(Effect.logError, Effect.log), (n: number) => Effect.succeed(String(n)))
```