export declare const isString: (i: any) => boolean;
export declare const isArray: (i: any) => boolean;
export declare const isObject: (i: any) => boolean;
export declare const isDate: (value: any) => boolean;
export declare const isFunction: (i: any) => any;
export declare const isFloat: (n: any) => boolean;
export declare const isInteger: (n: any) => boolean;
export declare const isNumber: (n: any) => boolean;
export declare const isEmpty: (value: any) => true | undefined;
export declare const isRegExp: (input: any) => boolean;
export declare const isBoolean: (input: any) => boolean;
export declare const isISO8601: (input: string) => boolean;
export declare const isNull: (i: any) => boolean;
export declare const isColor: (input: string) => boolean;
declare const WTF: {
    string: (i: any) => boolean;
    object: (i: any) => boolean;
    date: (value: any) => boolean;
    fn: (i: any) => any;
    array: (i: any) => boolean;
    float: (n: any) => boolean;
    integer: (n: any) => boolean;
    number: (n: any) => boolean;
    regexp: (input: any) => boolean;
    boolean: (input: any) => boolean;
    empty: (value: any) => true | undefined;
    ISO8601: (input: string) => boolean;
    color: (input: string) => boolean;
    null: (i: any) => boolean;
};
export default WTF;