export interface IMountPort<TElement = unknown> {
    element(): TElement | null;
    onElement(callback: (element: TElement) => void): Disposable;
}
export declare class MountPort<TElement = unknown> implements IMountPort<TElement> {
    private el;
    private callbacks;
    element(): TElement | null;
    onElement(callback: (element: TElement) => void): Disposable;
    resolve(element: TElement): void;
}