Uncaught ReferenceError: goog is not defined (anonymous function)

Uncaught ReferenceError: goog is not defined (anonymous function)

我正在尝试将 intl-tel-input 与 rails 应用程序一起使用,但出现此错误:

Uncaught ReferenceError: goog is not defined (anonymous function)

来自这段代码

// includes
goog.require('i18n.phonenumbers.AsYouTypeFormatter');
goog.require('i18n.phonenumbers.PhoneNumberFormat');
goog.require('i18n.phonenumbers.PhoneNumberUtil');

请告知如何解决?

我通过以下方式解决了我的问题:

添加

gem 'intl-tel-input-rails'

到我的 Gemfile