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interface / @typed/fx

Fx.Fx.Service

An Fx whose implementation is obtained from an Effect service.

Package version
2.0.0-beta.7
Category
Providing services
Since
1.0.0
Member of
Fx.Fx

Import

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

Access Fx.Fx.Service through the imported Fx 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

interface Service<Self, Id extends string, A, E> extends Fx<A, E, Self> {
    readonly id: Id;
    readonly service: Context.Service<Self, Fx<A, E>>;
    readonly make: <R = never>(fx: Fx<A, E, R> | Effect.Effect<Fx<A, E, R>, E, R>) => Layer<Self, E, Exclude<R, Scope.Scope>>;
}

Why

Long-lived producers can be selected and replaced through Effect’s service graph while remaining directly usable as Fx<A, E, Self>.

Ownership and lifetime

The service declaration owns nothing. A layer made with make owns the supplied producer for that layer’s scope; each run reads the installed service.

Property: id

Stable diagnostic identifier used to create the Effect service.

Property: id: Why

Keeps the service identity visible to diagnostics and tooling.

Property: id: Ownership and lifetime

Reading the identifier starts no work and owns no resource.

Property: make

Builds a layer from an Fx, or from an Effect that acquires one.

Property: make: Why

Connects producer acquisition directly to Effect’s service graph.

Property: make: Ownership and lifetime

Scope is removed from the layer requirements because layer acquisition supplies it. Other services and typed failures remain visible.

Property: service

Effect service tag containing the installed producer.

Property: service: Why

Exposes the underlying Effect service for direct context and layer composition.

Property: service: Ownership and lifetime

The tag is inert; the layer that installs its value owns the producer lifetime.

Examples

import { Fx } from "@typed/fx"
import type { Fx as FxModel } from "@typed/fx/Fx"

class Ticks extends Fx.Service<Ticks, number>()("app/Ticks") {}
const service: FxModel.Service<Ticks, "app/Ticks", number, never> = Ticks

Other public imports

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

Source