/**
 * Focuses the first focusable element inside a trigger element.
 * Supports custom elements by searching both the element's shadow root
 * and its light DOM.
 *
 * @param trigger - The trigger element to focus.
 * @returns `true` if focus was moved, otherwise `false`.
 */
export declare const focusTriggerElement: (trigger?: HTMLElement | null) => boolean;
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