react project created based on creat-react-app,. In order to solve the compatibility of IE with some methods of Es6, babel-polyfill is introduced into the project. Can run normally in the local development environment, performing packaging upload to the server found that it did not take effect, and still reported an error

:
1 webpack.config.prod.js

2index.js

3npm run build

this should be that the packaging was not successful, right?

4, effect