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prebid / Prebid.js / 16504477541

24 Jul 2025 06:08PM UTC coverage: 96.266%. Remained the same
16504477541

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Feature: added obtention of gpid, divid and other information and adding tests (#13624)

Co-authored-by: Jordi Arnau <jarnau@tappx.com>

39408 of 48411 branches covered (81.4%)

37 of 37 new or added lines in 2 files covered. (100.0%)

16 existing lines in 7 files now uncovered.

194828 of 202385 relevant lines covered (96.27%)

83.0 hits per line

Source File
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66.67
/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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