static processNavigation()

in src/sdk/lh-trace-processor.ts [777:844]
39 lines of code
4 McCabe index (conditional complexity)

  static processNavigation(processedTrace) {
    const { frameEvents, frameTreeEvents, timeOriginEvt, timings, timestamps } =
      processedTrace;

    // Compute the key frame timings for the main frame.
    const frameTimings = this.computeNavigationTimingsForFrame(frameEvents, {
      timeOriginEvt,
    });

    // Compute FCP for all frames.
    const fcpAllFramesEvt = frameTreeEvents.find(
      e => e.name === 'firstContentfulPaint' && e.ts > timeOriginEvt.ts
    );

    if (!fcpAllFramesEvt) {
      throw this.createNoFirstContentfulPaintError();
    }

    // Compute LCP for all frames.
    const lcpAllFramesEvt = this.computeValidLCPAllFrames(
      frameTreeEvents,
      timeOriginEvt
    ).lcp;

    /** @param {number} ts */
    const getTiming = ts => (ts - timeOriginEvt.ts) / 1000;
    /** @param {number=} ts */
    const maybeGetTiming = ts => (ts === undefined ? undefined : getTiming(ts));

    return {
      timings: {
        timeOrigin: timings.timeOrigin,
        firstPaint: frameTimings.timings.firstPaint,
        firstContentfulPaint: frameTimings.timings.firstContentfulPaint,
        firstContentfulPaintAllFrames: getTiming(fcpAllFramesEvt.ts),
        firstMeaningfulPaint: frameTimings.timings.firstMeaningfulPaint,
        largestContentfulPaint: frameTimings.timings.largestContentfulPaint,
        largestContentfulPaintAllFrames: maybeGetTiming(
          lcpAllFramesEvt && lcpAllFramesEvt.ts
        ),
        load: frameTimings.timings.load,
        domContentLoaded: frameTimings.timings.domContentLoaded,
        traceEnd: timings.traceEnd,
      },
      timestamps: {
        timeOrigin: timestamps.timeOrigin,
        firstPaint: frameTimings.timestamps.firstPaint,
        firstContentfulPaint: frameTimings.timestamps.firstContentfulPaint,
        firstContentfulPaintAllFrames: fcpAllFramesEvt.ts,
        firstMeaningfulPaint: frameTimings.timestamps.firstMeaningfulPaint,
        largestContentfulPaint: frameTimings.timestamps.largestContentfulPaint,
        largestContentfulPaintAllFrames: lcpAllFramesEvt && lcpAllFramesEvt.ts,
        load: frameTimings.timestamps.load,
        domContentLoaded: frameTimings.timestamps.domContentLoaded,
        traceEnd: timestamps.traceEnd,
      },
      firstPaintEvt: frameTimings.firstPaintEvt,
      firstContentfulPaintEvt: frameTimings.firstContentfulPaintEvt,
      firstContentfulPaintAllFramesEvt: fcpAllFramesEvt,
      firstMeaningfulPaintEvt: frameTimings.firstMeaningfulPaintEvt,
      largestContentfulPaintEvt: frameTimings.largestContentfulPaintEvt,
      largestContentfulPaintAllFramesEvt: lcpAllFramesEvt,
      loadEvt: frameTimings.loadEvt,
      domContentLoadedEvt: frameTimings.domContentLoadedEvt,
      fmpFellBack: frameTimings.fmpFellBack,
      lcpInvalidated: frameTimings.lcpInvalidated,
    };
  }