export type Listener<T = Emitter> = ((evt: EEvent<T>) => void) & {
    fn?: Listener;
};
export interface EventType {
    type: string;
    payload?: any;
}
export declare class EEvent<T> {
    type: string;
    target: unknown;
    currentTarget: T;
    propagationStarted: boolean;
    payload?: any;
    constructor(eventType: EventType, currentTarget: T);
    stopImmediatePropagation(): void;
}
export declare class Emitter {
    __listeners: Map<string, Listener[]>;
    addListener: (eventType: string | string[], listener: Listener<this>) => this;
    removeListener: (eventType?: string | string[], listener?: Listener<this>) => this;
    constructor();
    on(eventType: string | string[], listener: Listener<this>): this;
    once(eventType: string | string[], listener: Listener<this>): this;
    off(eventType?: string | string[], listener?: Listener<this>): this;
    emit(eventType: EventType): number;
    emit(eventType: string, payload?: any): number;
    listeners(eventType: string): Listener[];
    listenerCount(eventType?: string): number;
    removeAllListeners(eventType?: string | string[]): this;
}
export declare function mixin<T extends object>(object: T): T & Emitter;
export default Emitter;