/**
 * Per-frame visibility + streaming counters. The VisibilitySystem fills the culling and
 * timing fields; the AssetStreamingSystem fills the asset fields. Everything is a plain
 * number so a HUD or the devtools hub can read it without adapters.
 */
export interface VisibilityStats {
    totalObjects: number;
    consideredForRender: number;
    rejectedByFrustum: number;
    rejectedByDistance: number;
    rejectedByOcclusion: number;
    drawCallsAvoided: number;
    visible: number;
    preloaded: number;
    assetsQueued: number;
    assetsLoading: number;
    assetsLoaded: number;
    assetsUnloaded: number;
    streamedBytes: number;
    spatialQueryMs: number;
    cullingMs: number;
}
export declare function createVisibilityStats(): VisibilityStats;
export declare function resetCullingStats(stats: VisibilityStats): void;
/** High-resolution clock that degrades to a monotonic-ish fallback when `performance` is absent. */
export declare function nowMs(): number;