/**
 * Check is empty value
 *
 * @param {*} value
 * @returns
 */
export declare function isEmpty(value: any): boolean;
export declare const isMobile: () => boolean;
export declare const objectToString: () => string;
export declare const toTypeString: (value: unknown) => string;
export declare const toRawType: (value: unknown) => string;
export declare const isPlainObject: (val: unknown) => val is object;
export declare const isIntegerKey: (key: unknown) => boolean;
export declare const isArray: (arg: any) => arg is any[];
export declare const isMap: (val: unknown) => val is Map<any, any>;
export declare const isSet: (val: unknown) => val is Set<any>;
export declare const isDate: (val: unknown) => val is Date;
export declare const isFunction: (val: unknown) => val is Function;
export declare const isString: (val: unknown) => val is string;
export declare const isSymbol: (val: unknown) => val is symbol;
export declare const isObject: (val: unknown) => val is Record<any, any>;
export declare const isPromise: <T = any>(val: unknown) => val is Promise<T>;
export declare const hasSymbol: boolean;
export declare const isEmail: (email: string) => boolean;