webpack-encore-babel-issue

Installing and adding @babel/plugin-proposal-decorators to the plugin list make encore exit without building.

To recreate the issue:

1. Clone this git repository
2. Run yarn install
3. Then run yarn encore (or npx encore dev --stats=verbose)
4. Encore should say Running webpack ... and then exists without building
5. Now comment out line 53 in webpack.config.js
6. Run yarn encore (or npx encore dev --stats=verbose) again and now it does build but without @babel/plugin-proposal-decorators