export declare const nativeToString: () => string;
/**
 * 检测变量类型
 * @param type
 */
export declare const variableTypeDetection: {
    isNumber: (value: any) => boolean;
    isString: (value: any) => boolean;
    isBoolean: (value: any) => boolean;
    isNull: (value: any) => boolean;
    isUndefined: (value: any) => boolean;
    isSymbol: (value: any) => boolean;
    isFunction: (value: any) => boolean;
    isObject: (value: any) => boolean;
    isArray: (value: any) => boolean;
    isProcess: (value: any) => boolean;
    isWindow: (value: any) => boolean;
};
/**
 * Checks whether given value's type is one of a few Error or Error-like
 * {../link isError}.
 *
 * ../param wat A value to be checked.
 * ../returns A boolean representing the result.
 */
export declare function isError(wat: any): boolean;
/**
 * 检查是否是空对象
 * ../param obj 待检测的对象
 */
export declare function isEmptyObject(obj: Object): boolean;
export declare function isEmpty(wat: any): boolean;
/**
 * Checks whether given value has a then function.
 * ../param wat A value to be checked.
 */
/**
 * Checks whether given value's type is an instance of provided constructor.
 * {../link isInstanceOf}.
 *
 * ../param wat A value to be checked.
 * ../param base A constructor to be used in a check.
 * ../returns A boolean representing the result.
 */
export declare function isInstanceOf(wat: any, base: any): boolean;
export declare function isExistProperty(obj: Object, key: string | number | symbol): boolean;