/**
 * Summarizes a sequence of measurements
 */
export declare class SmePerformanceSummary {
    label: string;
    startTime: number;
    totalLoadTime: number;
    timestamps: {
        [index: string]: number;
    };
}
/**
 * Web Vitals metrics to track. See more details at https://web.dev/vitals/
 */
export declare enum WebVitalFields {
    CLS = "CumulativeLayoutShift",
    LCP = "LargestContentfulPaint",
    FCP = "FirstContentfulPaint",
    FID = "FirstInputDelay",
    TTFB = "TimeToFirstByte",
    TBT = "TotalBlockingTime",
    TTI = "TimeToInteractive"
}
/**
 * List performance entry types that are relevant for our metrics.
 */
export declare enum PerformanceEntryType {
    LongTask = "longtask",
    Resource = "resource",
    Mark = "mark",
    Navigation = "navigation"
}
/**
 * Simplified performance entry type with only a start time, end time, and entryType.
 */
export declare class TaskTiming {
    startTime: number;
    endTime: number;
    entryType: PerformanceEntryType;
}
/**
 * Performance tracker class handles two things:
 * 1) Tracking lighthouse metrics (see https://web.dev/vitals/)
 * 2) Providing a wrapper to mark various times in code for performance measurement.
 * This is used primarily for shell and various tools to determine load times.
 */
export declare class PerformanceTracker {
    static get smePrefix(): string;
    /**
     * The source name to use when logging about this service.
     */
    private static get logSourceName();
    private static markIndexLoaded;
    private static markCoreEnvironmentInitStarted;
    private static markCoreEnvironmentInitCompleted;
    private static markManifestLoadStarted;
    private static markLocalizationStarted;
    private static markAccessibilityManagerStarted;
    private static markAppContextServiceStarted;
    private static markAppContextRpcInitStarted;
    private static markAppContextRpcInitComplete;
    private static markAppModuleInitialized;
    private static markAppComponentInitialized;
    private static markCriticalDataLoaded;
    private static markNavigationInitialized;
    private static markNavigationStarted;
    private static markNavigationCompleted;
    private static markNavigationMeasure;
    private static moduleOpening;
    /**
     * Used to keep track of various marks when measuring arbitrary timings.
     */
    private static dataLoadMap;
    /**
     * Counter for total blocking time on initial loadup. This should be reset every time a new page is initialized.
     */
    private static totalBlockingTime;
    private static lighthouseMetrics;
    private static ttiIntervalCheck;
    private static ttiInProgress;
    private static wacPo;
    private static fcp;
    private static tasks;
    static readonly timeToInteractiveNotFound = -1;
    static readonly quietWindowLength = 5000;
    static readonly ttiTimeout = 10000;
    static readonly ttiTimeoutThreshold = 2;
    static readonly totalBlockingTimeThresholdRequirement = 50;
    private static setLighthouseField;
    /**
     * Calculate Time to Interactive using list of longtask and resource events. Time to Interactive calculation
     * method can be found at https://web.dev/tti#what-is-tti
     * @param taskList List of all longtask and resource events from current time.
     * @returns Returns time to interactive if it exists, TTI_NOT_FOUND if not.
     */
    static tryFindTti(taskList: TaskTiming[]): number;
    /**
     * Initialize interval to calculate time to interactive. TTI will only be calculated if WAC is in non-production mode;
     * b/c calculation itself is non-performant. In production, we will use FID as a proxy for TTI.
     */
    static tryStartCalculatingTimeToInteractive(): void;
    /**
     * Initialize web-vitals trackers for all lighthouse metrics. If function not supported (eg due to browser limitations)
     * log warning and return.
     */
    static initializeLighthouseMetricsTrackers(): void;
    static coreEnvironmentInitStarted(): void;
    static coreEnvironmentInitCompleted(): void;
    static manifestLoadStarted(): void;
    static localizationStarted(): void;
    static accessibilityManagerStarted(): void;
    static appContextServiceStarted(): void;
    static appContextRpcInitStarted(): void;
    static appContextRpcInitComplete(): void;
    static appModuleInitialized(): void;
    static appComponentInitialized(): void;
    static navigationInitialized(): void;
    static navigationStarted(): void;
    static navigationCompleted(moduleOpened: boolean): void;
    static criticalDataLoaded(): void;
    /**
     * Mark an arbitrary measurement with a label. Clear the previous mark(s) prior to starting new one - allow only one at
     * all times.
     * @param label The label for the mark and the index for the entry in the internal map.
     */
    static markDataLoadStart(label: string): void;
    /**
     * Mark an arbitrary measurement with a label. Intended to be a midpoint between a start and end.
     * @param label The label for the entry in the data map.
     * @param specificLabel The label for the mark
     */
    static markDataIntermediary(label: string, specificLabel?: string): void;
    /**
     * Get a summary object from the aggregate data points marked previously.
     * @param label The label for the entry in the data map dictionary
     * @param specificLabel The label for the new measurement
     * @returns     The performance summary of the multiple marks.
     */
    static markDataLoadEnd(label: string, specificLabel?: string): SmePerformanceSummary;
    /**
     * Log app component load time - this contains timings up to when the appComponent is loaded.
     */
    private static logAppComponentLoadTime;
    /**
     * Log critical data load time - this measures the time from angular's startNavigation event to a module to the point at
     * which criticalDataLoad() is called, usually in the ngInit of a module
     */
    private static logCriticalDataLoadTime;
}