import { PartialObserver, Subscribable, Unsubscribable } from 'rxjs';
import { Action, FlowStart, Transition } from './flow.model';
export declare class Flow<E extends Action> implements Subscribable<Action> {
    private transitions;
    private flow$;
    constructor(flowStart: FlowStart, transitions: Transition<any>[]);
    subscribe(observer?: PartialObserver<E>): Unsubscribable;
    subscribe(next: null, error: null, complete: () => void): Unsubscribable;
    subscribe(next: null, error: (error: any) => void, complete?: () => void): Unsubscribable;
    subscribe(next: (value: E) => void, error: null, complete: () => void): Unsubscribable;
    subscribe(next?: (value: E) => void, error?: (error: any) => void, complete?: () => void): Unsubscribable;
}