export declare const isUndefined: (obj: any) => boolean;
export declare const isNull: (obj: any) => boolean;
export declare const isObject: (obj: any) => boolean;
export declare const isEmpty: (obj: any) => boolean;
export declare const isArray: (obj: any) => boolean;
export declare const isBoolean: (obj: any) => boolean;
export declare const isArguments: (obj: any) => boolean;
export declare const isFunction: (obj: any) => boolean;
export declare const isString: (obj: any) => boolean;
export declare const isNumber: (obj: any) => boolean;
export declare const isDate: (obj: any) => boolean;
export declare const isRegExp: (obj: any) => boolean;
export declare const isError: (obj: any) => boolean;
export declare const isNaN: (obj: any) => boolean;
export declare const subtract: (a: any, b: any) => {};
export declare const isEqual: (a: any, b: any) => boolean;
export declare const clone: (obj: any) => any;
export declare const deepClone: (obj: any) => any;