import { Dayjs } from 'dayjs';
import { ReactNode } from 'react';
export declare function isFile(obj: any): obj is File;
export declare function isBlob(obj: any): obj is Blob;
export declare function isColor(color: any): boolean;
export declare function isEmptyObject(obj: any): boolean;
export declare function isEmptyReactNode(content: any, trim?: boolean): boolean;
export declare function isExist(obj: any): boolean;
export declare function isWindow(el: any): el is Window;
export declare function isDayjs(time: any): time is Dayjs;
export declare const isReactComponent: (element: ReactNode) => boolean;
export declare const isClassComponent: (element: any) => boolean;
export declare const isDOMElement: (element: ReactNode) => boolean;
export declare const supportRef: (element: any) => boolean;
export declare const isContains: (root: HTMLElement, ele: any) => boolean;