import { LitElement } from 'lit';
/**
 * Renders a template into a portal. Defaults to `document.body`.
 *
 * @example
 * ```ts
 * render() {
 *   return html`${showPortal
 *     ? html`<affine-portal .template=${portalTemplate}></affine-portal>`
 *     : null}`;
 * };
 * ```
 */
export declare class Portal extends LitElement {
    container: HTMLElement;
    template: import("lit").TemplateResult<1>;
    private _portalRoot;
    disconnectedCallback(): void;
    createRenderRoot(): HTMLDivElement;
    render(): import("lit").TemplateResult<1>;
}
declare global {
    interface HTMLElementTagNameMap {
        'affine-portal': Portal;
    }
}
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