import { Events } from './events';
export declare class Emitter<EventTypes> {
    events: Map<string, Function[]>;
    silent: boolean;
    constructor(source: Events | Emitter<EventTypes>);
    on<K extends keyof EventTypes & string>(eventNames: K | K[], handler: (args: EventTypes[K]) => any): this;
    trigger<K extends keyof EventTypes & string>(eventName: K, params?: EventTypes[K] | {}): boolean;
    bind(eventName: string): void;
    exist(eventName: string): boolean;
}