export declare function assertMaybeInstanceOf<T>(name: string, mixed: any, clazz: {
    new (...args: any[]): T;
    name: string;
}): (null | undefined | (T)) | never;
export declare function assertMaybeInstanceOfHandler<T>(clazz: {
    new (...args: any[]): T;
    name: string;
}): (name: string, mixed: any) => (null | undefined | (T)) | never;