Creates a scoped run function that forks effects into a new FiberSet and returns a Promise for each effect result.

When to use

Use when many scoped fibers should be tracked as a set while exposing each result through Promise-based APIs.

Details

Managed fibers are removed when they complete and are interrupted when the set's scope closes. Each Promise resolves with the effect's success value or rejects with the squashed failure cause.

Example (Creating a promise runtime)

import { Effect, FiberSet } from "effect"

const program = Effect.gen(function*() {
  const runPromise = yield* FiberSet.makeRuntimePromise()

  // Run effects as promises
  const promise1 = runPromise(Effect.succeed("hello"))
  const promise2 = runPromise(Effect.succeed("world"))

  const result1 = yield* Effect.promise(() => promise1)
  const result2 = yield* Effect.promise(() => promise2)

  console.log(result1, result2) // "hello" "world"
})