/**
 * Content-based change tracking for the per-frame hide/isolate sets.
 *
 * The renderer caches per-batch visibility keyed by the version this tracker
 * produces, so correctness demands the version bumps EXACTLY when the
 * effective filter changes:
 * - Callers may mutate the SAME Set object in place between frames (the
 *   per-mesh filters read the live set every frame, so a reference-compare
 *   epoch would silently diverge from them) — content comparison against a
 *   snapshot catches this.
 * - Callers may pass a FRESH Set with identical content every frame (zustand
 *   slices rebuild the Set on every action) — content comparison avoids a
 *   needless cache rebuild that a reference compare would force.
 */
export declare class VisibilityEpochTracker {
    private version;
    private hiddenSnapshot;
    private isolatedSnapshot;
    /**
     * Feed the sets passed to render(); returns the current version, bumped when
     * the content changed since the previous call. An EMPTY hidden set is
     * equivalent to no hidden filter; an EMPTY isolated set is NOT equivalent to
     * null (it isolates nothing, i.e. hides everything). Cost is
     * O(|hidden| + |isolated|) membership checks per call — strictly below the
     * O(scene elements) per-batch scan this version key lets the renderer skip.
     */
    update(hiddenIds: ReadonlySet<number> | null | undefined, isolatedIds: ReadonlySet<number> | null | undefined): number;
    getVersion(): number;
}
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