/**
 * simple event bus
 */
export default class {
    private listeners;
    on(type: string, fun: (p?: any) => void, opts?: Opts): void;
    off(type: string, fun: () => void): void;
    dispatch(type: string, data: any): void;
    clear(type?: string): void;
}
export interface Item {
    callback: (p?: any) => void;
    opts: Opts;
}
export interface Opts {
    once?: boolean;
}