/**
 * 创建uuid
 * @param size uuid长度，默认12
 */
export declare function uuid(size?: number): string;
/**
 * 创建uuid, 使用增量方式创建
 */
export declare function uuidSeq(): string;
export declare function isNull(v: any): boolean;
export declare function isMap(v: any): boolean;
/**
 * 获取运行环境
 */
export declare function runtime(): "node" | "electron" | "browser";
/**
 * 是否在node运行环境
 */
export declare function inNode(): void;
export declare function inElectron(): boolean;
export declare function inBrowser(): boolean;