Function assertSuccess

third_party/subscriptions-project/swg.js:13587–13601

* Returns the response if successful or otherwise throws an error. * @param {!FetchResponse} response * @return {!Promise<!FetchResponse>} * @private Visible for testing

(response)

 * @private Visible for testing
 */
function assertSuccess(response) {
  return new Promise((resolve) => {
    if (response.ok) {
      return resolve(response);
    }

    const {status} = response;
    const err = new Error(`HTTP error ${status}`);
    err.retriable = isRetriable(status);
    // TODO(@jridgewell, #9448): Callers who need the response should
    // skip processing.
    err.response = response;
    throw err;
  });
}

/**
 * Response object in the Fetch API.