export declare const IS_FOCUSABLE_QUERY: string;
export declare function getFocusableElements(elements: HTMLElement[], properties?: {
    filter?: (el: HTMLElement) => boolean;
    findFirstFocusable?: boolean;
    includeInvisibleElements?: boolean;
}): HTMLElement[];
export declare function getFirstFocusableElement(elements: HTMLElement[], filter?: (el: HTMLElement) => boolean): HTMLElement | null;
export declare class SbbFocusHandler {
    private _controller;
    /**
     * @param element in which the focus should be trapped.
     * @param options options object.
     * @param options.filter filter function which is applied during searching for focusable element. If an element is filtered, also child elements are filtered.
     * @param options.postFilter filter function which is applied after collecting focusable elements.
     */
    trap(element: HTMLElement, options?: {
        filter?: (el: HTMLElement) => boolean;
        postFilter?: (el: HTMLElement) => boolean;
    }): void;
    disconnect(): void;
}
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