/**
 * Lightweight SSR metrics collector.
 *
 * @module bquery/ssr
 */
export interface SSRMetricsSnapshot {
    hydrationMismatches: number;
    renderCount: number;
    slotCount: number;
    totalRenderMs: number;
    totalSlotMs: number;
}
export interface SSRMetrics {
    /** Records a completed render duration in milliseconds. */
    recordRender(durationMs: number): void;
    /** Records one streamed/deferred slot duration in milliseconds. */
    recordSlot(durationMs: number): void;
    /** Records a hydration mismatch observation. */
    recordHydrationMismatch(): void;
    /** Returns the current immutable metrics snapshot. */
    snapshot(): SSRMetricsSnapshot;
}
export declare const createSSRMetrics: () => SSRMetrics;
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