export declare const isObjectLike: (value: any) => boolean;
export declare const isNumber: (value: any) => boolean;
export declare const isNaN: (value: any) => boolean;
export declare const isPlainObject: (value: any) => boolean;
export declare const isError: (value: any) => boolean;
export declare const isObject: (value: any) => boolean;
export declare const isImage: (filePath: any) => boolean;
/**
 *判断 timestamp 是否合法
 * @param timestamp 时间戳
 * @returns
 */
export declare const isValidTimestamp: (timestamp: unknown) => boolean;