function createResourceTimingSpans()

in packages/rum-core/src/performance-monitoring/navigation/resource-timing.js [62:99]

• 23 lines of code
• 9 McCabe index (conditional complexity)

function createResourceTimingSpans(entries, requestPatchTime, trStart, trEnd) {
  const spans = []
  for (let i = 0; i < entries.length; i++) {
    const { initiatorType, name, startTime, responseEnd } = entries[i]
    /**
     * Skip span creation if initiatorType is other than known types specified as part of RESOURCE_INITIATOR_TYPES
     * The reason being, there are other types like embed, video, audio, navigation etc
     *
     * Check the below webplatform test to know more
     * https://github.com/web-platform-tests/wpt/blob/b0020d5df18998609b38786878f7a0b92cc680aa/resource-timing/resource_initiator_types.html#L93
     */
    if (
      RESOURCE_INITIATOR_TYPES.indexOf(initiatorType) === -1 ||
      name == null
    ) {
      continue
    }

    /**
     * Create Spans for API calls (XHR, Fetch) only if its not captured by the patch
     *
     * This would happen if our agent is downlaoded asyncrhonously and page does
     * API requests before the agent patches the required modules.
     */
    if (
      (initiatorType === 'xmlhttprequest' || initiatorType === 'fetch') &&
      (isIntakeAPIEndpoint(name) ||
        isCapturedByPatching(startTime, requestPatchTime))
    ) {
      continue
    }

    if (shouldCreateSpan(startTime, responseEnd, trStart, trEnd)) {
      spans.push(createResourceTimingSpan(entries[i]))
    }
  }
  return spans
}