export interface IPortal<T = any> {
    readonly instance: T;
    readonly host: HTMLElement | null;
    attach(): Promise<void>;
    detach(): void;
}
declare abstract class BasePortal<T> implements IPortal {
    protected component: () => any;
    protected attached: boolean;
    protected portalInstance: any;
    protected _instance: T | undefined;
    protected target: HTMLElement | null;
    protected context: any;
    protected _host: HTMLElement | null;
    constructor(component: () => any, options?: {
        /**
         * 挂载目标
         *
         * 为`null`的话 则代表创建完成之后手动执行挂载操作
         *
         * 默认为 `document.body`
         */
        target?: HTMLElement | null;
        context?: any;
    });
    /**
     * 等待当前setup上下文全部执行完毕
     *
     * @remark
     * 如果当前上下文没有全部执行完成的话就调用`attach`的话 会导致后面的 composition API 都没办法正确挂载到正确的地方
     */
    protected waitSetupFinish(): Promise<void>;
    get instance(): T | undefined;
    get host(): HTMLElement | null;
    abstract attach(): Promise<void>;
    abstract detach(): void;
}
export declare class Vue3Portal<T extends {} = any> extends BasePortal<T> {
    constructor(component: () => any, options?: {
        /**
         * 挂载目标
         *
         * 为`null`的话 则代表创建完成之后手动执行挂载操作
         *
         * 默认为 `document.body`
         */
        target?: HTMLElement | null;
        context?: any;
    });
    attach(): Promise<undefined>;
    detach(): undefined;
    private getExposeOrProxy;
    private createAppContext;
    private mergeAppContext;
    private createPortal;
    private createOutlet;
}
/**
 *
 * @experimental
 *
 * @remarks
 * `vue3` 下需要注意以下几点
 * - 其挂载内容如果为存在子组件的话 必须走导入模式
 * ```
 * // good
 * <ElButton> S </ElButton>
 * import {ElButton} from 'element-plus';
 *
 * // bad 不要用这种 不会被解析成组件
 * <el-button> S </el-button>
 * ```
 *
 */
export declare const Portal: new <T>(component: () => any, options?: {
    /**
     * 挂载目标
     *
     * 为`null`的话 则代表创建完成之后手动执行挂载操作
     *
     * 默认为 `document.body`
     */
    target?: HTMLElement | null;
    context?: any;
}) => IPortal<T>;
export {};
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