import { LitElement, type TemplateResult } from 'lit';
/**
 * Renders a template into a portal. Defaults to `document.body`.
 *
 * Note that every time the parent component re-renders, the portal will be re-called.
 *
 * See https://lit.dev/docs/components/rendering/#writing-a-good-render()-method
 *
 * @example
 * ```ts
 * render() {
 *   return html`${showPortal
 *     ? html`<blocksuite-portal .template=${portalTemplate}></blocksuite-portal>`
 *     : null}`;
 * };
 * ```
 */
export declare class Portal extends LitElement {
    private _portalRoot;
    createRenderRoot(): ShadowRoot | HTMLDivElement;
    disconnectedCallback(): void;
    render(): TemplateResult | undefined;
    accessor container: HTMLElement;
    accessor shadowDom: boolean | ShadowRootInit;
    accessor template: TemplateResult | undefined;
}
declare global {
    interface HTMLElementTagNameMap {
        'blocksuite-portal': Portal;
    }
}
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