import { Dayjs } from 'dayjs';
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 isColor(color: any): boolean;
export declare function isUndefined(obj: any): obj is undefined;
export declare function isNull(obj: any): obj is null;
export declare function 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 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 function isBoolean(value: any): value is Boolean;
export declare const isReactComponent: (element: any) => boolean;
export declare const isClassComponent: (element: any) => boolean;
export declare const isDOMElement: (element: any) => boolean;
export declare const supportRef: (element: any) => boolean;
