import { Observable } from 'rxjs';
import { ActionCreatorWithPayload, ActionCreatorWithoutPayload } from './ActionCreator';
import { UnknownAction } from '../internal/types';
import { ObservableState } from '../observableState';
export type ActionStream = Observable<UnknownAction>;
export type ActionDispatcher = (action: UnknownAction, namespace?: string) => void;
/**
 * Helper type for extracting the payload type from an action creator
 *
 * ```
 * type Payload = ExtractPayload<typeof myAction>;
 * ```
 */
export type ExtractPayload<ActionType extends ActionCreatorWithPayload<any>> = ReturnType<ActionType>['payload'];
/**
 * Type helper to infer the payload of an action creator.
 * This should be preferred over exporting the types separately.
 */
export type InferPayloadFromActionCreator<TActionCreator> = TActionCreator extends ActionCreatorWithPayload<infer TValueType> ? TValueType : TActionCreator extends ActionCreatorWithoutPayload ? void : never;
/**
 * The equivalent of TypeScript's built-in `Awaited` but for observables.
 * Infer the type of the value wrapped inside an Observable.
 */
export type Observed<TObservable> = TObservable extends Observable<infer TValueType> ? TValueType : TObservable extends ObservableState<infer TValueType> ? TValueType : never;