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variable / @typed/fx

Push.mapBoth

Transforms both the output (Fx) success and error channels of a Push using the provided options.

Mirrors Effect.mapBoth on the Fx side: onSuccess maps every emitted value one-to-one and onFailure maps typed failures via Cause.map; defects and interrupts are preserved. Ordering, services, and the input side are unchanged.

Package version
2.0.0-beta.13
Category
Transforming outputs
Since
1.0.0
Member of
Push

Import

import { Push } from "@typed/fx";

Access Push.mapBoth through the imported Push export. Its declaration below describes the member.

This public exposure is a re-export. Its import path is supported; declaration documentation is shared with the other public exposures below.

Signatures

export declare const mapBoth: {
    <B, C, E2, E3>(options: {
        readonly onFailure: (e: E2) => E3;
        readonly onSuccess: (b: B) => C;
    }): <A, E, R, R2>(push: Push<A, E, R, B, E2, R2>) => Push<A, E, R, C, E3, R2>;
    <A, E, R, B, E2, R2, C, E3>(push: Push<A, E, R, B, E2, R2>, options: {
        readonly onFailure: (e: E2) => E3;
        readonly onSuccess: (b: B) => C;
    }): Push<A, E, R, C, E3, R2>;
};

Why

Adapt both observable result channels at once while leaving command handling and non-typed Cause information intact.

Ownership and lifetime

Both functions run synchronously in the output delivery path and acquire no resources. The wrapped Fx retains ownership of its subscription and finalizers.

Examples

import { Effect } from "effect"
import * as Fx from "@typed/fx/Fx"
import * as Push from "@typed/fx/Push"
import * as Sink from "@typed/fx/Sink"

const push = Push.make(Sink.make(() => Effect.void, (_: string) => Effect.void), Fx.succeed(2))
const labeled = Push.mapBoth(push, {
  onFailure: (error: never) => error,
  onSuccess: (value) => `value:${value}`
})

Other public imports

These import paths expose the same declaration. Each page retains its own public name and signature.

Source