import { Part, ChildPart } from 'lit-html';
import { AsyncDirective } from 'lit-html/async-directive.js';
declare class PortalDirective extends AsyncDirective {
    _op?: ChildPart;
    _outlet?: HTMLElement;
    _content?: unknown;
    render(content: unknown, outlet?: HTMLElement): import("lit-html").TemplateResult<1>;
    update(part: Part, [content, outlet]: [unknown, HTMLElement?]): import("lit-html").TemplateResult<1>;
    updateOutlet(outlet: HTMLElement, content: unknown): void;
    clearOutlet(): void;
    disconnected(): void;
    reconnected(): void;
}
export declare const portal: (content: unknown, outlet?: HTMLElement | undefined) => import("lit-html/directive.js").DirectiveResult<typeof PortalDirective>;
export {};