/** Start recording changes to `root` and everything under it, short of a shadow root: a `MutationObserver` does not enter one. */
export declare function watch(root: Element): void;
/** Stop the watch, if one is running, and drop what it recorded. */
export declare function unwatch(): void;
/**
 * Stop the watch and name what changed, outside the regions the page marked
 * ignored. Absent when nothing was watching, which is not the same answer as
 * nothing changing.
 */
export declare function takeWatch(): readonly string[] | undefined;
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