export declare function promiseMaybeInstanceOf<T>(name: string, mixed: any, clazz: {
    new (...args: any[]): T;
    name: string;
}): Promise<null | undefined | (T)>;
export declare function promiseMaybeInstanceOfHandler<T>(clazz: {
    new (...args: any[]): T;
    name: string;
}): (name: string, mixed: any) => Promise<null | undefined | (T)>;