export declare type Handler<T = any> = (event: T) => void;
export declare type EventType = string | symbol | number;
export interface EventMap {
    sdf: Handler<number>;
    bss: Handler<string>;
}
export declare type EventKey = keyof EventMap;
export declare class Emitter {
    private eventHandlerMap;
    constructor();
    on<T>(eventType: EventType, handler: Handler<T>): void;
    onAll<T>(eventTypes: EventType[], handler: Handler<T>): void;
    once<T>(eventType: EventType, handler: Handler<T>): void;
    off<T>(eventType: EventType, handler?: Handler<T>): void;
    emit<T>(eventType: EventType, event: T): void;
    dispose(): void;
}