/**
 * Dropdown helper functions
 */
/**
 * Sets the active state (is-active class and aria-checked) on a theme item element.
 */
export declare function setItemActiveState(item: Element, isActive: boolean): void;
/**
 * Sets tabindex attribute on all items in a collection.
 */
export declare function setTabindexBatch(items: HTMLElement[], value: string): void;
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