How to use the lighthouse-logger.verbose function in lighthouse-logger

prepare() {
    const platform = getPlatform() as SupportedPlatforms;
    if (!_SUPPORTED_PLATFORMS.has(platform)) {
      throw new UnsupportedPlatformError();
    }

    this.userDataDir = this.userDataDir || this.makeTmpDir();
    this.outFile = this.fs.openSync(`${this.userDataDir}/chrome-out.log`, 'a');
    this.errFile = this.fs.openSync(`${this.userDataDir}/chrome-err.log`, 'a');

    // fix for Node4
    // you can't pass a fd to fs.writeFileSync
    this.pidFile = `${this.userDataDir}/chrome.pid`;

    log.verbose('ChromeLauncher', `created ${this.userDataDir}`);

    this.tmpDirandPidFileReady = true;
  }

prepare() {
        const platform = utils_1.getPlatform();
        if (!_SUPPORTED_PLATFORMS.has(platform)) {
            throw new utils_1.UnsupportedPlatformError();
        }
        this.userDataDir = this.userDataDir || this.makeTmpDir();
        this.outFile = this.fs.openSync(`${this.userDataDir}/chrome-out.log`, 'a');
        this.errFile = this.fs.openSync(`${this.userDataDir}/chrome-err.log`, 'a');
        // fix for Node4
        // you can't pass a fd to fs.writeFileSync
        this.pidFile = `${this.userDataDir}/chrome.pid`;
        log.verbose('ChromeLauncher', `created ${this.userDataDir}`);
        this.tmpDirandPidFileReady = true;
    }
    launch() {

let firstMeaningfulPaint = frameEvents.find(
      e => e.name === 'firstMeaningfulPaint' && e.ts > navigationStart.ts
    );
    let fmpFellBack = false;

    // If there was no firstMeaningfulPaint event found in the trace, the network idle detection
    // may have not been triggered before Lighthouse finished tracing.
    // In this case, we'll use the last firstMeaningfulPaintCandidate we can find.
    // However, if no candidates were found (a bogus trace, likely), we fail.
    if (!firstMeaningfulPaint) {
      const fmpCand = 'firstMeaningfulPaintCandidate';
      fmpFellBack = true;
      log.verbose('trace-of-tab', `No firstMeaningfulPaint found, falling back to last ${fmpCand}`);
      const lastCandidate = frameEvents.filter(e => e.name === fmpCand).pop();
      if (!lastCandidate) {
        log.verbose('trace-of-tab', 'No `firstMeaningfulPaintCandidate` events found in trace');
      }
      firstMeaningfulPaint = lastCandidate;
    }

    // LCP's trace event was first introduced in m78. We can't surface an LCP for older Chrome versions
    // LCP comes from the latest `largestContentfulPaint::Candidate`, but it can be invalidated
    // by a `largestContentfulPaint::Invalidate` event. In the case that the last candidate is
    // invalidated, the value will be undefined.
    let largestContentfulPaint;
    let lcpInvalidated = false;
    // Iterate the events backwards.
    for (let i = frameEvents.length - 1; i >= 0; i--) {
      const e = frameEvents[i];
      // If the event's timestamp is before the navigation start, stop.
      if (e.ts <= navigationStart.ts) break;
      // If the last lcp event in the trace is 'Invalidate', there is inconclusive data to determine LCP.

let firstMeaningfulPaint = frameEvents.find(
      e => e.name === 'firstMeaningfulPaint' && e.ts > navigationStart.ts
    );
    let fmpFellBack = false;

    // If there was no firstMeaningfulPaint event found in the trace, the network idle detection
    // may have not been triggered before Lighthouse finished tracing.
    // In this case, we'll use the last firstMeaningfulPaintCandidate we can find.
    // However, if no candidates were found (a bogus trace, likely), we fail.
    if (!firstMeaningfulPaint) {
      const fmpCand = 'firstMeaningfulPaintCandidate';
      fmpFellBack = true;
      log.verbose('trace-of-tab', `No firstMeaningfulPaint found, falling back to last ${fmpCand}`);
      const lastCandidate = frameEvents.filter(e => e.name === fmpCand).pop();
      if (!lastCandidate) {
        log.verbose('trace-of-tab', 'No `firstMeaningfulPaintCandidate` events found in trace');
      }
      firstMeaningfulPaint = lastCandidate;
    }

    // LCP comes from the latest `largestContentfulPaint::Candidate`, but it can be invalidated
    // by a `largestContentfulPaint::Invalidate` event. In the case that the last candidate is
    // invalidated, the value will be undefined.
    let largestContentfulPaint;
    for (let i = frameEvents.length - 1; i >= 0; i--) {
      const e = frameEvents[i];
      if (e.ts <= navigationStart.ts) break;
      if (e.name === 'largestContentfulPaint::Invalidate') break;
      if (e.name !== 'largestContentfulPaint::Candidate') continue;
      largestContentfulPaint = e;
      break;
    }

_shouldToggleDomain(domain, sessionId, enable) {
    const key = domain + (sessionId || '');
    const enabledCount = this._domainEnabledCounts.get(key) || 0;
    const newCount = enabledCount + (enable ? 1 : -1);
    this._domainEnabledCounts.set(key, Math.max(0, newCount));

    // Switching to enabled or disabled, respectively.
    if ((enable && newCount === 1) || (!enable && newCount === 0)) {
      log.verbose('Driver', `${domain}.${enable ? 'enable' : 'disable'}`);
      return true;
    } else {
      if (newCount < 0) {
        log.error('Driver', `Attempted to disable domain '${domain}' when already disabled.`);
      }
      return false;
    }
  }

_emitNetworkStatus() {
    const zeroQuiet = this.isIdle();
    const twoQuiet = this.is2Idle();

    if (twoQuiet && zeroQuiet) {
      log.verbose('NetworkRecorder', 'network fully-quiet');
      this.emit('network-2-idle');
      this.emit('networkidle');
    } else if (twoQuiet && !zeroQuiet) {
      log.verbose('NetworkRecorder', 'network semi-quiet');
      this.emit('network-2-idle');
      this.emit('networkbusy');
    } else {
      log.verbose('NetworkRecorder', 'network busy');
      this.emit('network-2-busy');
      this.emit('networkbusy');
    }
  }

_emitNetworkStatus() {
    const zeroQuiet = this._getActiveIdlePeriod(0);
    const twoQuiet = this._getActiveIdlePeriod(2);

    if (twoQuiet && zeroQuiet) {
      log.verbose('NetworkRecorder', 'network fully-quiet');
      this.emit('network-2-idle');
      this.emit('networkidle');
    } else if (twoQuiet && !zeroQuiet) {
      log.verbose('NetworkRecorder', 'network semi-quiet');
      this.emit('network-2-idle');
      this.emit('networkbusy');
    } else {
      log.verbose('NetworkRecorder', 'network busy');
      this.emit('network-2-busy');
      this.emit('networkbusy');
    }
  }

_emitNetworkStatus() {
    const zeroQuiet = this._getActiveIdlePeriod(0);
    const twoQuiet = this._getActiveIdlePeriod(2);

    if (twoQuiet && zeroQuiet) {
      log.verbose('NetworkRecorder', 'network fully-quiet');
      this.emit('network-2-idle');
      this.emit('networkidle');
    } else if (twoQuiet && !zeroQuiet) {
      log.verbose('NetworkRecorder', 'network semi-quiet');
      this.emit('network-2-idle');
      this.emit('networkbusy');
    } else {
      log.verbose('NetworkRecorder', 'network busy');
      this.emit('network-2-busy');
      this.emit('networkbusy');
    }
  }

_emitNetworkStatus() {
    const zeroQuiet = this.isIdle();
    const twoQuiet = this.is2Idle();

    if (twoQuiet && zeroQuiet) {
      log.verbose('NetworkRecorder', 'network fully-quiet');
      this.emit('network-2-idle');
      this.emit('networkidle');
    } else if (twoQuiet && !zeroQuiet) {
      log.verbose('NetworkRecorder', 'network semi-quiet');
      this.emit('network-2-idle');
      this.emit('networkbusy');
    } else {
      log.verbose('NetworkRecorder', 'network busy');
      this.emit('network-2-busy');
      this.emit('networkbusy');
    }
  }