import type { Attachment } from 'svelte/attachments';
/**
 * Second click on a popover invoker must close it.
 *
 * `popover="auto"` light-dismisses when the trigger (outside the panel) is
 * clicked, then `popovertargetaction="toggle"` / a custom `onclick` opens it
 * again. Remember "was open" on pointerdown and cancel that reopen.
 */
export declare function bindPopoverInvokerToggle(trigger: HTMLElement, getPanel: () => HTMLElement | null | undefined): () => void;
/** `{@attach popoverInvokerToggle(() => panelEl)}` on a popover invoker button. */
export declare function popoverInvokerToggle(getPanel: () => HTMLElement | null | undefined): Attachment<HTMLElement>;