export interface FocusOptions {
    initialFocusEl?: HTMLElement;
    skipInitialFocus?: boolean;
}
export declare class FocusTrap {
    private readonly root;
    private readonly options;
    private elFocusedBeforeTrapFocus;
    constructor(root: HTMLElement, options?: FocusOptions);
    /**
     * Traps focus in `root`. Also focuses on either `initialFocusEl` if set;
     * otherwises sets initial focus to the first focusable child element.
     */
    trapFocus(): void;
    /**
     * Releases focus from `root`. Also restores focus to the previously focused
     * element.
     */
    releaseFocus(): void;
    /**
     * Wraps tab focus within `el` by adding two hidden sentinel divs which are
     * used to mark the beginning and the end of the tabbable region. When
     * focused, these sentinel elements redirect focus to the first/last
     * children elements of the tabbable region, ensuring that focus is trapped
     * within that region.
     */
    private wrapTabFocus;
    /**
     * Focuses on `initialFocusEl` if defined and a child of the root element.
     * Otherwise, focuses on the first focusable child element of the root.
     */
    private focusInitialElement;
    private getFocusableElements;
    private createSentinel;
}
export declare const focusTrapFactory: (el: HTMLElement, focusOptions?: FocusOptions) => FocusTrap;