@sentry/browser/build/npm/esm/dev/tracing/backgroundtab.js

Official Sentry SDK for browsers

import { getActiveSpan, getRootSpan, spanToJSON, debug, SPAN_STATUS_ERROR } from '@sentry/core/browser';
import { DEBUG_BUILD } from '../debug-build.js';
import { WINDOW } from '../helpers.js';

function registerBackgroundTabDetection() {
  if (WINDOW.document) {
    WINDOW.document.addEventListener("visibilitychange", () => {
      const activeSpan = getActiveSpan();
      if (!activeSpan) {
        return;
      }
      const rootSpan = getRootSpan(activeSpan);
      if (WINDOW.document.hidden && rootSpan) {
        const cancelledStatus = "cancelled";
        const { op, status } = spanToJSON(rootSpan);
        if (DEBUG_BUILD) {
          debug.log(`[Tracing] Transaction: ${cancelledStatus} -> since tab moved to the background, op: ${op}`);
        }
        if (!status) {
          rootSpan.setStatus({ code: SPAN_STATUS_ERROR, message: cancelledStatus });
        }
        rootSpan.setAttribute("sentry.cancellation_reason", "document.hidden");
        rootSpan.end();
      }
    });
  } else {
    DEBUG_BUILD && debug.warn("[Tracing] Could not set up background tab detection due to lack of global document");
  }
}

export { registerBackgroundTabDetection };
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