# FlatMapLike

Describes a dual flattening operator whose callback returns an Fx.

## Signatures

```ts
export type FlatMapLike<Args extends ReadonlyArray<any> = [
]> = {
    <A, B, E2, R2>(f: (a: A) => Fx<B, E2, R2>, ...args: Args): <E, R>(self: Fx<A, E, R>) => Fx<B, E | E2, R | R2 | Scope.Scope>;
    <A, E, R, B, E2, R2>(self: Fx<A, E, R>, f: (a: A) => Fx<B, E2, R2>, ...args: Args): Fx<B, E | E2, R | R2 | Scope.Scope>;
};
```

## Why

The shared type keeps data-first and data-last call styles consistent across
merge, concat, switch, and exhaust policies while preserving the callback's
success, error, and service channels.

## Ownership and lifetime

The type acquires no resources. Implementations return an Fx requiring
`Scope`; that Scope owns any admitted inner subscriptions and their cleanup.