type FocusDirection = "advance" | "previous";
export interface FocusGuardScope {
    popover: HTMLElement;
    direction: FocusDirection;
    allowedTarget?: HTMLElement | null;
    allowTargetInteraction?: boolean;
    autoFocus?: boolean;
    /** The caller focuses a control later: keep a focus already in scope until then. */
    deferFocus?: boolean;
    fallback?: HTMLElement | null;
}
export declare class FocusGuard {
    private initialFocus;
    private document;
    private popover;
    private allowedTarget;
    private allowTargetInteraction;
    private fallback;
    private fallbackLease;
    private direction;
    private active;
    private redirecting;
    private readonly handleFocusIn;
    activate(scope: FocusGuardScope): void;
    update(scope: FocusGuardScope): void;
    focus(): void;
    /**
     * Remembers the element focus returns to when the guard deactivates. The driver calls it before
     * making the rest of the page inert, because inerting an ancestor blurs the focused element.
     * Does nothing once a focus is remembered or the guard is active. `pending` is a focus a clear
     * could not give back before this show replaced it, and wins over the current focus.
     */
    captureInitialFocus(reference: HTMLElement, pending?: HTMLElement | null): void;
    deactivate(): void;
    /**
     * Stops guarding and returns the element focus should go back to, without moving focus. Lets
     * the caller restore it once the page has left `inert`: screen readers ignore focus moved onto
     * content their accessibility tree has not caught up with yet.
     */
    release(): HTMLElement | null;
    private isAllowed;
    private focusFallback;
    private setFallback;
    private restoreFallback;
    private findFocusable;
}
export {};