export default class TypeHelper {
    static type(target: any): string;
    static get undef(): undefined;
    static isUndef(obj: any): obj is undefined;
    static isString(target: any): target is string;
    static isObject(target: any): target is object;
    static isFunction(target: any): target is Function;
    static isBoolean(target: any): target is boolean;
    static isArray(target: any): target is [];
}