"Pass all your pack names when using javascript_packs_with_chunks_tag helper otherwise you will get duplicated chunks on the page"
```slim
<%= stylesheet_pack_tag 'YOUR_PACK_NAME_HERE' %>
<%# DO %>
<%= javascript_packs_with_chunks_tag 'calendar', 'map' %>
<%# DON'T %>
<%= javascript_packs_with_chunks_tag 'calendar' %>
<%= javascript_packs_with_chunks_tag 'map' %>
```
https://github.com/rails/webpacker/blob/master/docs/webpack.md#add-splitchunks-webpack-v4