Function getErrorReportData

src/error-reporting.js:490–653

(
  message,
  filename,
  line,
  col,
  error,
  hasNonAmpJs
)

 * visibleForTesting
 */
export function getErrorReportData(
  message,
  filename,
  line,
  col,
  error,
  hasNonAmpJs
) {
  message = buildErrorMessage_(message, error);
  // An "expected" error is still an error, i.e. some features are disabled
  // or not functioning fully because of it. However, it's an expected
  // error. E.g. as is the case with some browser API missing (storage).
  // Thus, the error can be classified differently by log aggregators.
  // The main goal is to monitor that an "expected" error doesn't deteriorate
  // over time. It's impossible to completely eliminate it.
  let expected = !!(error && error.expected);
  if (/_reported_/.test(message)) {
    return;
  }
  if (message == CANCELLED) {
    return;
  }

  const detachedWindow = !(self && self.window);
  const throttleBase = Math.random();

  // We throttle load errors and generic "Script error." errors
  // that have no information and thus cannot be acted upon.
  if (
    isLoadErrorMessage(message) ||
    // See https://github.com/ampproject/amphtml/issues/7353
    // for context.
    message == 'Script error.' ||
    // Window has become detached, really anything can happen
    // at this point.
    detachedWindow
  ) {
    expected = true;

    if (throttleBase < NON_ACTIONABLE_ERROR_THROTTLE_THRESHOLD) {
      return;
    }
  }

  const isUserError = isUserErrorMessage(message);

  // Only report a subset of user errors.
  if (isUserError && throttleBase < USER_ERROR_THROTTLE_THRESHOLD) {
    return;
  }

  // This is the App Engine app in
  // https://github.com/ampproject/error-tracker
  // It stores error reports via https://cloud.google.com/error-reporting/
  // for analyzing production issues.
  const data = /** @type {!JsonObject} */ (Object.create(null));
  data['v'] = getMode().rtvVersion;
  data['noAmp'] = hasNonAmpJs ? '1' : '0';