import type { IPathLens } from '../../libs/standard-lens';
import type { WithLensInstance, WithPayloadTypes } from './async.builder.types';
import type { AsyncState } from './async.types';
/**
 * Builds a lens that goes from an async state to its payload.
 *
 * @param builder
 */
export declare function buildPayloadLens<SuccessType, FailureType, IdleType>(builder: Partial<WithPayloadTypes<SuccessType, FailureType, IdleType>>): IPathLens<AsyncState<SuccessType, FailureType, IdleType>, IdleType | SuccessType>;
/**
 * Builds a lens that goes from the outer structure to the payload of an async state.
 *
 * @param builder
 */
export declare function buildPayloadLens<SuccessType, FailureType, IdleType, OuterStructureType>(builder: Partial<WithPayloadTypes<SuccessType, FailureType, IdleType>> & WithLensInstance<SuccessType, FailureType, IdleType, OuterStructureType>): IPathLens<OuterStructureType, IdleType | SuccessType>;