import Taro, { NodesRef } from '@tarojs/taro';
/**
 * 生成组件的 className
 * @internal
 *
 * @param compName - 组件名
 * @returns
 */
export declare function getPrefixCls(compName: string): string;
/**
 * 参数是否为 string 类型
 * @param arg
 * @returns
 */
export declare function isString(arg: unknown): arg is string;
/**
 * 获取系统信息
 * @returns
 */
export declare function getSystemInfo(): Promise<Taro.getSystemInfo.Result>;
/**
 * 根据 selector 获取元素尺寸等信息
 * @param selector
 * @returns
 */
export declare function selectorQueryClientRect(selector: string): Promise<NodesRef.BoundingClientRectCallbackResult>;
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