@braze/web-sdk/src/models/backend-errors.js

Braze SDK for web sites and other JS platforms.

export default {
  $u: "invalid_api_key",
  Xu: "blacklisted",
  Lu: "no_device_identifier",
  Mu: "invalid_json_response",
  zu: "empty_response",
  __: "sdk_auth_error",
};