/**
 * Every tabbable element inside `container` that layout actually shows, in document order.
 *
 * @param container - The overlay element to search.
 * @returns The laid-out tabbables, plus the active element if it is not laid out yet.
 *
 * @internal Not part of the public API; import it inside the package only.
 */
export declare function visibleTabbables(container: HTMLElement): HTMLElement[];
/**
 * Cycles Tab and Shift+Tab within `container`, so focus never escapes an open overlay.
 *
 * @param container - The overlay element whose tabbables form the cycle.
 * @param event - A `keydown` event; anything but `Tab` is left alone.
 *
 * @internal Not part of the public API; import it inside the package only.
 */
export declare function wrapTabFocus(container: HTMLElement, event: KeyboardEvent): void;