export declare function isArray(obj: any): obj is any[];
export declare function isObject(obj: any): obj is {
    [key: string]: any;
};
export declare function isString(obj: any): obj is string;
export declare function isNumber(obj: any): obj is number;
export declare function isRegExp(obj: any): boolean;
export declare function isFile(obj: any): obj is File;
export declare function isBlob(obj: any): obj is Blob;
export declare function isUndefined(obj: any): obj is undefined;
export declare function isNull(obj: any): obj is undefined;
export declare const isNullOrUndefined: (obj: any) => boolean;
export declare function isFunction(obj: any): obj is (...args: any[]) => any;
export declare function isEmptyObject(obj: any): boolean;
export declare function isEmptyArray(array: any): boolean;
export declare function isWindow(el: any): el is Window;
export declare function isPlainObject(obj: unknown): obj is Record<string, any>;