/**
 * `transition-group` 使用了取巧地实现方式。对 <For> 组件的每一个 Slot 包装进 TransitionGroupItem，
 * `TransitionGroupItem` 在 `onUnmount` 也就是实际销毁前，先将自身状态主动变更为已销毁，从而欺骗框架层跳过对该组件的销毁，
 * 也就保留了 dom 不被移除，直到 leave 动画结束后，才又将状态变为正常后调用 `destroyComponent` 函数执行实际的销毁。
 */
import { ComponentHost } from '../../core';
import type { JNode, WithChildren } from '../../jsx';
import { type AnyFn } from '../../util';
import { type ForSlot } from '../for';
import type { KEY_DATA, KEY_INDEX } from '../for/common';
import type { TransitionClassnames } from './transition';
declare const CLASSNAMES: unique symbol;
declare const APPEAR: unique symbol;
declare const ONDESTROY: unique symbol;
export declare function TransitionGroupItem(props: {
    [CLASSNAMES]: string[][];
    [APPEAR]: boolean;
    [ONDESTROY]: (fn: AnyFn) => AnyFn;
} & WithChildren<JNode>, host: ComponentHost): Node[];
export interface TransitionGroupProps<T> {
    loop: T[] | null | undefined;
    /** TransitionGroup 必须指定 key */
    key: keyof T | typeof KEY_DATA | typeof KEY_INDEX;
    appear?: boolean;
}
export declare function TransitionGroup<T>(props: TransitionGroupProps<T> & TransitionClassnames & WithChildren<ForSlot<T>>, hostRoot: ComponentHost): Node[];
export {};