export type PerformanceMeasures = "ViewerInitialized" | "BaseViewerInitialized" | "IModelConnecting" | "IModelConnected" | "ViewStateCreated" | "TileTreesLoaded";
export type PerformanceMarks = "ViewerStarting" | "ViewerStarted" | "BaseViewerStarted" | "IModelConnectionStarted" | "IModelConnection" | "ViewStateCreation" | "TilesLoaded";
export declare class ViewerPerformance {
    private static _enabled;
    static get enabled(): false | Performance;
    static enable(enable?: boolean): void;
    static addMark(markName: PerformanceMarks): void;
    static addMeasure(measureName: PerformanceMeasures, startMark: PerformanceMarks, endMark: PerformanceMarks): void;
    static clear(): void;
}
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