export interface PerformanceMetrics {
    fps: number;
    frameTime: number;
    fishCount: number;
    jellyfishCount: number;
    bubbleCount: number;
    updateTime: number;
    renderTime: number;
}
export interface IOceanPerformanceMonitor {
    startFrame(): void;
    endUpdate(): void;
    endRender(fishCount: number, jellyfishCount: number, bubbleCount: number): void;
    getMetrics(): PerformanceMetrics;
    isEnabled(): boolean;
    setEnabled(enabled: boolean): void;
}
/**
 * Lightweight performance monitor for ocean background.
 * Tracks FPS, frame times, and entity counts.
 * Disabled by default - enable via console or dev tools.
 */
export declare class OceanPerformanceMonitor implements IOceanPerformanceMonitor {
    private enabled;
    private frameStart;
    private updateEnd;
    private lastFrameTime;
    private frameCount;
    private fpsUpdateInterval;
    private lastFpsUpdate;
    private currentFps;
    private frameTimes;
    private updateTimes;
    private renderTimes;
    private readonly maxSamples;
    private latestMetrics;
    startFrame(): void;
    endUpdate(): void;
    endRender(fishCount: number, jellyfishCount: number, bubbleCount: number): void;
    getMetrics(): PerformanceMetrics;
    isEnabled(): boolean;
    setEnabled(enabled: boolean): void;
    private reset;
    private average;
}
export declare function setMonitorInstance(monitor: OceanPerformanceMonitor): void;
//# sourceMappingURL=OceanPerformanceMonitor.d.ts.map