export declare function isDate(val: any): val is Date;
export declare function isObject(val: any): val is Object;
export declare function getTypes(val: any): string;
export declare function ext<T, U>(to: T, from: U): T & U;
export declare function isFormData(val: any): val is FormData;
export declare function isUrlSearchParams(val: any): val is URLSearchParams;