export interface IEventEmitter<T extends object = {
    [s: string]: (target: any, data: any) => void;
}> {
    on<K extends keyof T>(event: Extract<K, string>, listener: T[K]): void;
    once<K extends keyof T>(event: Extract<K, string>, listener: T[K]): void;
    off<K extends keyof T>(event: Extract<K, string>, listener: T[K]): void;
    emit<K extends keyof T>(event: Extract<K, string>, data: Parameters<any>[1]): void;
}