import { EventBus, PredicateFn } from "./EventBus";
export declare type BusEvent<T extends object = any> = {
    type: string;
    payload: T;
    meta?: any;
};
export declare type EventTypeDescriptor<T extends {
    type: string;
}> = {
    eventType: T["type"];
};
export declare type EventFrom<T extends (...args: any) => BusEvent> = ReturnType<T>;
export declare type DispatchFn<E> = (a: E) => void;
export declare type UnsubscribeFn = () => any;
export declare type SubscribeFn<E extends BusEvent> = (dispatch: DispatchFn<E>, bus: EventBus) => UnsubscribeFn;
export declare type SubscriptionDef<T extends BusEvent> = string | EventCreatorFn<T> | PredicateFn<T> | T["type"];
export declare type SubscribeWithPayloadDispatchFn<E extends BusEvent> = (dispatch: DispatchFn<E["payload"]>, bus: EventBus) => UnsubscribeFn;
export declare type EventCreatorFn<T extends {
    type: string;
    payload: any;
}> = ((payload: T["payload"]) => T) & EventTypeDescriptor<T>;