export type EventName = "ready" | "refresh" | "update" | "activation";
export interface Listeners {
    [key: string]: Function[];
}
export declare class Emitter {
    private _listeners;
    constructor();
    addListener(eventName: EventName, fn: Function): void;
    removeListener(eventName: EventName, fn: Function): void;
    removeAllListeners(eventName?: EventName): void;
    emit(eventName: EventName, ...args: any[]): void;
}