import { Operation , OperationFunction } from '../operation' ; import { Future } from '../future' ; import type { Task , TaskOptions } from '../task' ; interface Spawn < T > extends OperationFunction < Task < T > > { within ( scope ) : Operation < Task < T > > ; } param operation typeParam export function spawn < T > ( operation ? , options ? ) { function spawn ( task ) { let { scope } = task . options ; if ( ! scope ) { throw new Error ( 'cannot run `spawn` on a task without scope' ) ; } let result = scope . run ( operation , options ) ; return Future . resolve ( result ) ; } function within ( scope ) { return scope . spawn ( operation , options ) ; } return Object . assign ( spawn , { within } ) ; }