import type { DOMLayer } from './root';
export interface BackdropElements {
    hide: HTMLElement;
    block: HTMLElement;
}
export declare function createBackdropParts(): BackdropElements;
export declare function updateLayers(wrapper: HTMLElement, topLayer: DOMLayer, { hide, block }: BackdropElements, options?: {
    asyncFocusChange?: false;
    forceFocus?: boolean;
}): void;
export declare function updateLayers(wrapper: HTMLElement, topLayer: DOMLayer, { hide, block }: BackdropElements, options: {
    asyncFocusChange?: true;
    forceFocus?: boolean;
}): Promise<void>;
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