import { Slot } from 'vue';
export declare const getSafeDocument: () => Document | null;
export declare const getSafeWindow: () => (Window & typeof globalThis) | null;
export declare const getActiveElement: (excludes?: readonly HTMLElement[]) => Element | null;
/**
 * @deprecated only used in BFormGroup, which is not an SFC... Function could probably be replaced with pure Vue
 */
export declare const attemptFocus: (el: Readonly<HTMLElement>, options?: Readonly<FocusOptions>) => boolean;
export declare const isEmptySlot: (el: Slot | undefined) => boolean;
/**
 * @deprecated only used in BFormGroup, which is not an SFC... Function could probably be replaced with pure Vue
 */
export declare const isVisible: (el: Readonly<Element>) => boolean;
export declare const getTransitionDelay: (element: Readonly<HTMLElement>) => number;
export declare const sortSlotElementsByPosition: (a: Readonly<HTMLElement> | null, b: Readonly<HTMLElement> | null) => number;
export declare const getModalZIndex: (element?: Readonly<HTMLElement | null>) => number;