export type Listener<K extends keyof Events, Events> = ((event: Event<K, Events>, target: EventEmitter<Events>) => any) & {
    [inheritedSym]?: boolean;
};
export type Listeners<Events> = {
    [K in keyof Events]: Listener<K, Events>[];
};
export interface ListenerOption {
    inherited?: boolean;
}
export type Event<K extends keyof Events, Events> = {
    type: K;
} & Events[K];
declare const inheritedSym: unique symbol;
export declare class EventEmitter<Events = Record<string, unknown>> {
    listeners: Listeners<Events>;
    onceMapping: Map<Listener<any, any>, Listener<any, any>>;
    parentEmitter?: EventEmitter<Partial<Events>>;
    on: <K extends keyof Events>(eventType: K, listener: Listener<K, Events>, options?: ListenerOption) => this;
    off: <K extends keyof Events>(eventType: K, listener: Listener<K, Events>) => this;
    addListener<K extends keyof Events>(eventType: K, listener: Listener<K, Events>, options?: ListenerOption): this;
    removeListener<K extends keyof Events>(eventType: K, listener: Listener<K, Events>): this;
    listenerCount(event: keyof Events): number;
    emit<K extends keyof Events>(event: string | Event<K, Events> | K): any;
    protected _emit<K extends keyof Events>(event: Event<K, Events> | K, lstns: Listeners<Events>[K], onlyInherited?: boolean): any;
    once<K extends keyof Events>(eventType: K, listener: Listener<K, Events>, options?: ListenerOption): this;
}
export {};