declare type EventArgs<T> = T extends any[] ? T : T extends any ? [T] : never[];
declare type EventReceiver<T> = (...args: EventArgs<T>) => void;
interface EventMap {
    [event: string]: any;
}
export declare class Emitter<M extends EventMap = any> {
    private callbacks;
    on<E extends keyof M>(event: E, callback: EventReceiver<M[E]>): this;
    once<E extends keyof M>(event: E, fn: EventReceiver<M[E]>): this;
    off<E extends keyof M>(event: E, callback: EventReceiver<M[E]>): this;
    emit<E extends keyof M>(event: E, ...args: EventArgs<M[E]>): this;
    removeListeners(): void;
}
export {};