import { Slot } from 'vue';
/**
 * @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;