import { VNode } from 'vue';
export declare function flattenFragment(nodes: VNode[]): VNode[];
export declare function filterSlot(nodes: VNode[]): VNode[];
/** @see https://github.com/tailwindlabs/headlessui/blob/d8424fe311923f6858f6e3d55083df957bca824d/packages/%40headlessui-vue/src/utils/render.ts#L139-L145 */
export declare function isValidElement(input: any): boolean;
export declare function isVisibleDOMElement(input: any): boolean;