/**
 * Works around monaco losing hovers when it runs inside a shadow root.
 *
 * Monaco installs a document-level `mousemove` listener as a fallback for browsers
 * that occasionally skip `mouseleave`, and decides the pointer left the editor with
 * `viewDomNode.contains(event.target)`. Events crossing a shadow boundary are
 * retargeted to the host, and the host is an *ancestor* of the view node, so that
 * check is false for every move. Monaco therefore reports a mouse leave on the same
 * event that opened the hover, and tears it down before it can be seen.
 *
 * Keeping editor mouse moves inside the shadow tree avoids that. Monaco's real
 * `mouseleave` listener sits on the view node itself and still fires correctly, and
 * its drag handling uses pointer events, which are untouched.
 */
export declare function keepEditorMouseMovesInShadowRoot(shadowRoot: ShadowRoot): () => void;