/** Returns enabled, visible options in their current DOM order. */
export declare function getVisibleCollectionOptions(options: HTMLElement[]): HTMLElement[];
/** Wraps an active option index in the collection bounds. */
export declare function wrapCollectionIndex(index: number, direction: 1 | -1, length: number): number;
/** Clears active styling and the active descendant relationship for a collection. */
export declare function clearCollectionActive(options: HTMLElement[], activeHost: HTMLElement | null): void;
/** Applies active styling and the active descendant relationship to one option. */
export declare function setCollectionActive(options: HTMLElement[], visibleOptions: HTMLElement[], index: number, activeHost: HTMLElement | null, idPrefix: string): HTMLElement | null;