import * as i0 from "@angular/core";
export interface FocusTrapActivateOptions {
    restoreFocusTo?: HTMLElement | null;
    getOrderedFocusables?: () => HTMLElement[];
    initialFocusIndex?: number;
}
export declare class FocusTrapService {
    private keyUnlisten?;
    private tabKeydownCaptureUnlisten?;
    private renderer;
    private activeTrapElement;
    private previouslyFocusedElement;
    private getOrderedFocusables;
    private initialFocusIndex;
    private readonly rendererFactory;
    constructor();
    activate(element: HTMLElement, options?: FocusTrapActivateOptions): void;
    deactivate(): void;
    private detachKeyListeners;
    private focusInitialElement;
    private handleTab;
    private getNextIndexInOrderedCycle;
    private getFocusableList;
    private getFocusableElements;
    static ɵfac: i0.ɵɵFactoryDeclaration<FocusTrapService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<FocusTrapService>;
}