Effect<void, never, never>Yields control back to the Effect runtime, allowing other fibers to execute.
Example (Yielding to other fibers)
import { Effect } from "effect"
const program = Effect.gen(function*() {
console.log("Before yield")
yield* Effect.yieldNow
console.log("After yield")
})
Effect.runPromise(program)export const const yieldNow: Effect<void>const yieldNow: {
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
Yields control back to the Effect runtime, allowing other fibers to execute.
Example (Yielding to other fibers)
import { Effect } from "effect"
const program = Effect.gen(function*() {
console.log("Before yield")
yield* Effect.yieldNow
console.log("After yield")
})
Effect.runPromise(program)
yieldNow: interface Effect<out A, out E = never, out R = never>The Effect interface defines a value that lazily describes a workflow or
job. The workflow requires some context R, and may fail with an error of
type E, or succeed with a value of type A.
When to use
Use when you need to represent a lazy, composable workflow that can require
services, fail with a typed error, or succeed with a typed value.
Details
Effect values model resourceful interaction with the outside world,
including synchronous, asynchronous, concurrent, and parallel interaction.
They use a fiber-based concurrency model, with built-in support for
scheduling, fine-grained interruption, structured concurrency, and high
scalability.
To run an Effect value, you need a Runtime, which is a type that is
capable of executing Effect values.
Effect<void> = import internalinternal.const yieldNow: Effect.Effect<void>const yieldNow: {
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}