import { Optional } from '@angular/core';
/**
 * The OverlayContainer is the container in which all overlays will load.
 * It should be provided in the root component to ensure it is properly shared.
 */
export declare class OverlayContainer {
    protected _containerElement: HTMLElement;
    private _themeClass;
    /**
     * Base theme to be applied to all overlay-based components.
     */
    themeClass: string;
    /**
     * This method returns the overlay container element.  It will lazily
     * create the element the first time  it is called to facilitate using
     * the container in non-browser environments.
     * @returns the container element
     */
    getContainerElement(): HTMLElement;
    /**
     * Create the overlay container element, which is simply a div
     * with the 'cdk-overlay-container' class on the document body.
     */
    protected _createContainer(): void;
}
export declare function OVERLAY_CONTAINER_PROVIDER_FACTORY(parentContainer: OverlayContainer): OverlayContainer;
export declare const OVERLAY_CONTAINER_PROVIDER: {
    provide: typeof OverlayContainer;
    deps: Optional[][];
    useFactory: (parentContainer: OverlayContainer) => OverlayContainer;
};