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variable / @typed/fx/RefSubject

updateEffect

Updates a RefSubject using an Effectful function.

Package version
2.0.0-beta.13
Category
State updates
Since
1.0.0

Import

import { updateEffect } from "@typed/fx/RefSubject";

Signatures

export declare const updateEffect: {
    <A, E2, R2>(f: (value: A) => Effect.Effect<A, E2, R2>): <E, R>(ref: RefSubject<A, E, R>) => Effect.Effect<A, E | E2, R | R2>;
    <A, E, R, E2, R2>(ref: RefSubject<A, E, R>, f: (value: A) => Effect.Effect<A, E2, R2>): Effect.Effect<A, E | E2, R | R2>;
};

Why

Updates a RefSubject using an Effectful function. The transition is serialized at the RefSubject rather than coordinated by callers or UI components.

Ownership and lifetime

Running update effect performs one serialized subject transition and resolves with its committed value. It acquires no resource; failures and services remain those of the source ref.

Examples

import { Effect } from "effect"
import * as RefSubject from "@typed/fx/RefSubject"

const program = Effect.gen(function* () {
  const count = yield* RefSubject.make(5)

  // Update with an async operation
  yield* RefSubject.updateEffect(count, (value) =>
    Effect.succeed(value * 2)
  )

  const result = yield* count
  console.log(result) // 10
})

Other public imports

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

Source