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@babel/runtime/helpers not found

See original GitHub issue

This may be related to #2564, but after replacing the dev branch with RC 12 and running npm run dev I’m getting the following output:

 ERROR  Failed to compile with 199 errors                                                                                                           4:29:10 PM

These dependencies were not found:

* @babel/runtime/helpers/interopRequireWildcard in ./~/bootstrap-vue/es/index.js, ./~/bootstrap-vue/es/components/badge/badge.js and 12 others
* @babel/runtime/helpers/interopRequireDefault in ./~/bootstrap-vue/es/components/index.js, ./~/bootstrap-vue/es/directives/index.js and 122 others
* @babel/runtime/helpers/defineProperty in ./~/bootstrap-vue/es/components/button/button.js, ./~/bootstrap-vue/es/components/button/button-close.js and 22 others
* @babel/runtime/helpers/typeof in ./~/bootstrap-vue/es/components/breadcrumb/breadcrumb.js, ./~/bootstrap-vue/es/components/link/link.js and 11 others
* @babel/runtime/helpers/objectSpread in ./~/bootstrap-vue/es/components/input-group/input-group-addon.js, ./~/bootstrap-vue/es/components/input-group/input-group-prepend.js and 8 others
* @babel/runtime/helpers/toConsumableArray in ./~/bootstrap-vue/es/components/card/card.js, ./~/bootstrap-vue/es/components/card/card-body.js and 1 other
* @babel/runtime/helpers/classCallCheck in ./~/bootstrap-vue/es/utils/popover.class.js, ./~/bootstrap-vue/es/utils/bv-event.class.js and 2 others
* @babel/runtime/helpers/createClass in ./~/bootstrap-vue/es/utils/popover.class.js, ./~/bootstrap-vue/es/utils/bv-event.class.js and 2 others
* @babel/runtime/helpers/possibleConstructorReturn in ./~/bootstrap-vue/es/utils/popover.class.js
* @babel/runtime/helpers/getPrototypeOf in ./~/bootstrap-vue/es/utils/popover.class.js
* @babel/runtime/helpers/inherits in ./~/bootstrap-vue/es/utils/popover.class.js

To install them, you can run: npm install --save @babel/runtime/helpers/interopRequireWildcard @babel/runtime/helpers/interopRequireDefault @babel/runtime/helpers/defineProperty @babel/runtime/helpers/typeof @babel/runtime/helpers/objectSpread @babel/runtime/helpers/toConsumableArray @babel/runtime/helpers/classCallCheck @babel/runtime/helpers/createClass @babel/runtime/helpers/possibleConstructorReturn @babel/runtime/helpers/getPrototypeOf @babel/runtime/helpers/inherits
> Listening at http://localhost:8080