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prebid / Prebid.js / 16428706368

21 Jul 2025 09:35PM UTC coverage: 96.258%. Remained the same
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Dev dependencies: add npm ecosystem to package updates (#13638)

* Dev dependencies: add npm ecosystem to package updates

* Update dependabot.yml

* Update dependabot.yml

* Update dependabot.yml

* Update dependabot.yml

* Update dependabot.yml

* Update .github/dependabot.yml

Co-authored-by: Demetrio Girardi <dgirardi@prebid.org>

* Update dependabot.yml

---------

Co-authored-by: Demetrio Girardi <dgirardi@prebid.org>

39347 of 48366 branches covered (81.35%)

194329 of 201883 relevant lines covered (96.26%)

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83.33
/libraries/timeToFirstBytesUtils/timeToFirstBytesUtils.js
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/**
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 * Calculates the Time to First Byte (TTFB) for the given window object.
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 *
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 * This function attempts to use the Navigation Timing Level 2 API first, and falls back to
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 * the Navigation Timing Level 1 API if the former is not available.
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 *
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 * @param {Window} win - The window object from which to retrieve performance timing information.
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 * @returns {string} The TTFB in milliseconds as a string, or an empty string if the TTFB cannot be determined.
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 */
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export function getTimeToFirstByte(win) {
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  const performance = win.performance || win.webkitPerformance || win.msPerformance || win.mozPerformance;
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  const ttfbWithTimingV2 = performance &&
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        typeof performance.getEntriesByType === 'function' &&
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        Object.prototype.toString.call(performance.getEntriesByType) === '[object Function]' &&
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        performance.getEntriesByType('navigation')[0] &&
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        performance.getEntriesByType('navigation')[0].responseStart &&
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        performance.getEntriesByType('navigation')[0].requestStart &&
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        performance.getEntriesByType('navigation')[0].responseStart > 0 &&
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        performance.getEntriesByType('navigation')[0].requestStart > 0 &&
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        Math.round(
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          performance.getEntriesByType('navigation')[0].responseStart - performance.getEntriesByType('navigation')[0].requestStart
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        );
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  if (ttfbWithTimingV2) {
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    return ttfbWithTimingV2.toString();
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  }
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  const ttfbWithTimingV1 = performance &&
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        performance.timing.responseStart &&
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        performance.timing.requestStart &&
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        performance.timing.responseStart > 0 &&
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        performance.timing.requestStart > 0 &&
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        performance.timing.responseStart - performance.timing.requestStart;
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  return ttfbWithTimingV1 ? ttfbWithTimingV1.toString() : '';
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}
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