Function onError

src/error-reporting.js:321–364

* Signature designed, so it can work with window.onerror * @param {string|undefined} message * @param {string|undefined} filename * @param {string|undefined} line * @param {string|undefined} col * @param {*|undefined} error * @this {!Window|undefined}

(message, filename, line, col, error)

 * @this {!Window|undefined}
 */
function onError(message, filename, line, col, error) {
  // Make an attempt to unhide the body but don't if the error is actually expected.
  // eslint-disable-next-line local/no-invalid-this
  if (this && this.document && (!error || !error.expected)) {
    // eslint-disable-next-line local/no-invalid-this
    makeBodyVisibleRecovery(this.document);
  }
  if (getMode().localDev || getMode().development || getMode().test) {
    return;
  }
  let hasNonAmpJs = false;
  try {
    hasNonAmpJs = detectNonAmpJs(self);
  } catch (ignore) {
    // Ignore errors during error report generation.
  }
  if (hasNonAmpJs && Math.random() < NON_AMP_JS_ERROR_THRESHOLD) {
    return;
  }
  const data = getErrorReportData(
    message,
    filename,
    line,
    col,
    error,
    hasNonAmpJs
  );
  if (data) {
    reportingBackoff(() => {
      try {
        return reportErrorToServerOrViewer(
          // eslint-disable-next-line local/no-invalid-this
          this,
          /** @type {!JsonObject} */
          (data)
        ).catch(() => {
          // catch async errors to avoid recursive errors.
        });
      } catch (e) {
        // catch async errors to avoid recursive errors.
      }
    });
  }
}

/**
 * Determines the error reporting endpoint which should be used.