import type { PipeStep } from './pipe$.js';
import type { Deferrable } from './types/inputs/Deferrable.js';
import type { Mutable } from './types/inputs/Mutable.js';
import type { Mutator } from './types/outputs/Mutator.js';
import type { Observable } from './types/outputs/Observable.js';
import type { Ref } from './types/outputs/Ref.js';
/**
 * Adds an observable feature to a resource. The added observable will emit each result from defer & mutate.
 *
 * @since 1.0.0
 */
export declare function yield$<O extends YieldOrigin>(): PipeStep<O, YieldResult<O>>;
export type YieldOrigin<D = unknown> = Deferrable<D> | Mutable<D>;
export type YieldOriginValue<O extends YieldOrigin> = (O extends Deferrable<infer D> ? Awaited<D> : unknown) & (O extends Mutable<any, infer D> ? Awaited<D> : unknown);
export type YieldResult<O extends YieldOrigin> = (O extends Deferrable<infer D> ? Ref<D> : unknown) & (O extends Mutable<infer A, infer D> ? Mutator<A, D> : unknown) & Observable<YieldOriginValue<O>>;