export declare const isUndefined: (value: any) => boolean;
export declare const isNull: (value: any) => boolean;
export declare const isBoolean: (value: any) => boolean;
export declare const isObject: (value: any) => boolean;
export declare const isArray: (value: any) => boolean;
export declare const isDate: (value: any) => boolean;
export declare const isBlob: (value: any) => any;
export declare const isFile: (value: any) => any;