import type { VNode } from 'vue';
export declare const getChildrenArray: (vn: VNode) => VNode<import("vue").RendererNode, import("vue").RendererElement, {
    [key: string]: any;
}>[] | (VNode<import("vue").RendererNode, import("vue").RendererElement, {
    [key: string]: any;
}> & any[]) | undefined;
/**
 * Return the first element
 * @param children
 */
export declare const getFirstElementFromChildren: (children: VNode[] | undefined) => HTMLElement | undefined;
/**
 * Determine the VNode type and return the corresponding element
 * @param vnode
 * @returns
 */
export declare const getFirstElementFromVNode: (vnode: VNode) => HTMLElement | undefined;
/**
 * merge extraProps for child
 * @param children
 * @param extraProps
 * @returns
 */
export declare const mergeFirstChild: (children: VNode[] | undefined, extraProps: Record<string, any> | ((vn: VNode) => Record<string, any>)) => boolean;
/** whether VNode[] is empty */
export declare const isEmptyChildren: (children?: VNode[]) => boolean;