/**
 * 是否是字符串
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isString: (val: any) => val is string;
/**
 * 是否是有效的数组
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isEffectArray: (val: any) => val is boolean;
/**
 * 是否是有效的对象
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isEffectObject: (val: any) => val is boolean;
/**
 * 是否是函数
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isFunction: (val: any) => val is Function;
/**
 * 是否是数字
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isNumber: (val: any) => val is number;
/**
 * 是否是布尔值
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isBoolean: (val: any) => val is boolean;
/**
 * 是否是null
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isNull: (val: any) => val is null;
/**
 * 是否是undefined
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isUndefined: (val: any) => val is undefined;
/**
 * 是否是有效值
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isValue: (val: any) => val is boolean;
/**
 * 是否是小数
 * @param     {any}     val
 * @returns   {boolean}
 */
export declare const isDecimal: (val: any) => val is boolean;