effect-io-ai

Package: effect
Module: Effect

Effect.using

Scopes all resources acquired by one effect to the lifetime of another effect.

Details

This function allows you to scope the resources acquired by one effect (self) to the lifetime of another effect (use). This ensures that the resources are cleaned up as soon as the use effect completes, regardless of how the use effect ends (success, failure, or interruption).

Example

import { Console, Effect } from "effect"

const acquire = Console.log("Acquiring resource").pipe(
  Effect.as(1),
  Effect.tap(Effect.addFinalizer(() => Console.log("Releasing resource")))
)
const use = (resource: number) => Console.log(`Using resource: ${resource}`)

const program = acquire.pipe(Effect.using(use))

Effect.runFork(program)
// Output:
// Acquiring resource
// Using resource: 1
// Releasing resource

See

• scopedWith Manage scoped operations with a temporary scope.

Signature

declare const using: { <A, A2, E2, R2>(use: (a: A) => Effect<A2, E2, R2>): <E, R>(self: Effect<A, E, R>) => Effect<A2, E2 | E, R2 | Exclude<R, Scope.Scope>>; <A, E, R, A2, E2, R2>(self: Effect<A, E, R>, use: (a: A) => Effect<A2, E2, R2>): Effect<A2, E | E2, R2 | Exclude<R, Scope.Scope>>; }

Source

Since v2.0.0