/**
 * Tells whether the chat window is visually covered by other UI (e.g. Dashboards' insight editing
 * overlay opened over the chat).
 *
 * The chat handles Escape itself on window level with no overlay stack awareness, and the covering
 * overlay may be rendered by a different application layer (host shell vs. dashboards remote), so
 * neither props nor a shared overlay controller can carry the "something is above you" signal
 * reliably. Hit-testing the chat window's center answers exactly the question that matters — what
 * would the user's click land on — regardless of who rendered the covering layer and how its
 * z-index came to be. When covered, Escape must be left to the covering layer; the chat may only
 * close itself when it is on top.
 */
export declare function isChatWindowCovered(doc?: Document): boolean;
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