/**
 * 是否存在事件订阅者
 * note: 不支持修饰符
 * @param name
 * @returns
 */
export declare function hasListener(name: string, instance?: any): boolean;
/**
 * 判断是否声明了 slots
 */
export declare function hasSlots(props: any, slots: any, name: string): boolean;
/**
 * 渲染 slot
 * @param props
 * @param slots
 * @param name
 * @param args
 * @returns
 */
export declare function renderSlot(props: any, slots: any, name: string, ...args: any[]): any;
/**
 * 从 VNode 中提取 props
 * @param vnode
 */
export declare function extraProps(vnode: any): any;
/**
 * 从 VNode 中提取 组件 name
 * @param vnode
 * @returns
 */
export declare function extraComponentName(vnode: any): any;
export declare function isFragment(vnode: any): boolean;
/**
 * 规范化子节点
 * 如果是 Vue 3 会对 Fragment 进行展开
 * @param children
 * @returns
 */
export declare function normalizeChildren(children: any[] | undefined | null): any[] | undefined;
/**
 * 从 children 中提取 props
 * @param children
 * @returns
 */
export declare function extraPropsFromChildren(children: any[] | undefined | null): any[] | undefined;
/**
 * 判断指定名称的组件是否存在
 * @param children
 * @param name
 */
export declare function hasChild(children: any[] | undefined | null, name: string): boolean | undefined;
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