export declare const isNull: (arg: any) => boolean;
export declare const isUndefined: (arg: any) => boolean;
export declare const isArr: (arg: any) => boolean;
export declare const isObj: (arg: any) => boolean;
export declare const isStr: (arg: any) => boolean;
export declare const isNum: (arg: any) => boolean;
export declare const isBoolean: (arg: any) => boolean;
export declare const isRegExp: (arg: any) => boolean;
export declare const isError: (arg: any) => boolean;
export declare const isDate: (arg: any) => boolean;
export declare const isSymbol: (arg: any) => boolean;