/**
 * JQHTML DOM Attachment Tracking
 *
 * Backs the component 'attach' / 'detach' lifecycle events.
 *
 * One document-level MutationObserver (childList + subtree) is installed the first
 * time any component expresses interest in attachment, and disconnected when the
 * last interested component is stopped or collected. The observer never inspects
 * mutation records: it is only a "the tree changed" tick. On each batch it walks
 * the tracked components and asks each to compare its root's isConnected against
 * its own recorded attachment state (Jqhtml_Component._attachment_check()). Cost is
 * O(tracked components) per mutation batch, independent of how much of the page
 * changed, and zero when nothing has opted in.
 *
 * Because MutationObserver delivers per microtask, a node moved synchronously
 * (remove + insert in one task, e.g. appendTo) never shows a transition. Only a
 * component whose root is actually off-document when the batch flushes is detached.
 *
 * Tracked components are held by WeakRef. A component that is removed from the
 * document natively (never stopped) and then dropped by everything else is therefore
 * collectable: the tracker pins nothing. Dead refs are pruned on the next batch.
 */
/** Start watching a component's root for attach/detach transitions. Idempotent. */
export declare function track_attachment(component: any): void;
/** Stop watching a component (called from _stop()). Idempotent. */
export declare function untrack_attachment(component: any): void;
/** Number of components currently tracked (diagnostics / tests). */
export declare function tracked_attachment_count(): number;
/** Whether the document observer is currently installed (diagnostics / tests). */
export declare function attachment_observer_active(): boolean;
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