import { EventType } from './eventType';
export type Priority = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9;
export type Clone<T> = {
    [K in keyof T]: T[K];
};
export interface Listener<Payload> {
    (payload: Payload): void;
}
export declare class EventBus<ReadableEvents extends EventType<unknown> = EventType<unknown>, WritableEvents extends EventType<unknown> = EventType<unknown>> {
    private static instance;
    private _emitter;
    constructor();
    emit<T extends WritableEvents & EventType<never>>(type: T): this;
    emit<T extends WritableEvents>(type: T, payload: T['payload']): this;
    on<T extends ReadableEvents>(type: T, handler: Listener<T['payload']>, priority?: Priority): this;
    off<T extends ReadableEvents>(type: T, handler: Listener<T['payload']>): this;
    /**
     * Return the listeners registered for a given event.
     */
    listeners<T extends ReadableEvents>(event: T): any;
    getSession(): EventBusSession<ReadableEvents, WritableEvents>;
    static EVENT_STOPPED: {};
    static getInstance(): EventBus;
    static getSession(): EventBusSession;
    static getSession<ReadableEvents extends EventType<unknown>, WritableEvents extends EventType<unknown>>(eventBus: EventBus<ReadableEvents, WritableEvents>): EventBusSession<ReadableEvents, WritableEvents>;
    static getSession<ReadableEvents extends EventType<unknown>, WritableEvents extends EventType<unknown>>(eventBus: EventBusSession<ReadableEvents, WritableEvents>): EventBusSession<ReadableEvents, WritableEvents>;
}
export declare class EventBusSession<ReadableEvents extends EventType<unknown> = EventType<unknown>, WritableEvents extends EventType<unknown> = EventType<unknown>> {
    eventBus: EventBus<ReadableEvents, WritableEvents>;
    private listenters;
    rawEventBus: EventBus<ReadableEvents, WritableEvents>;
    constructor(eventBus: EventBus<ReadableEvents, WritableEvents>);
    on<T extends ReadableEvents>(type: T, handler: Listener<T['payload']>, priority?: Priority): this;
    off<T extends ReadableEvents>(type: T, handler: Listener<T['payload']>): this;
    emit<T extends WritableEvents & EventType<never>>(type: T): this;
    emit<T extends WritableEvents>(type: T, payload: T['payload']): this;
    clear(): void;
}