export type Callback<Ctx, E, Data> = (data: Data, e: E, ctx?: Ctx) => void;
export declare class Events<Evt extends {
    [e: string]: any;
} = any, Ctx = undefined> {
    private _ctx?;
    private _cb;
    private _cbs;
    constructor(ctx?: Ctx);
    emit<E extends keyof Evt>(e: E, data?: Evt[E]): this;
    on<E extends keyof Evt>(ev: E, cb: Callback<Ctx, E, Evt[E]>): this;
    any<E extends keyof Evt>(cb: Callback<Ctx, E, Evt[E]>): this;
    once<E extends keyof Evt>(ev: E, cb: Callback<Ctx, E, Evt[E]>): this;
    off<E extends keyof Evt>(e?: E, cb?: Callback<Ctx, E, Evt[E]>): this;
}