After update, plugin not working w/ react-scripts | jQuery.Deferred exception: MyPlugin is not defined

[rfdc]

Is this a bug report?

Not Sure, but it used to work before react-scripts was introduced!
I had some extra config at Webpack config such as:

   new webpack.ProvidePlugin({
      $: 'jquery',
       jQuery: 'jquery',
       'window.jQuery': 'jquery'
   })

AND

new CopyWebpackPlugin([
     {from: root('public/html'), to: root('dist/html')},
     {from: root('public/lang'), to: root('dist/lang')},
     {from: root('public/productDesigner'), to: root('dist/productDesigner')},
])

Did you try recovering your dependencies?

Yes.

Which terms did you search for in User Guide?

react-scripts, Webpack ProvidePlugin, CopyWebpackPlugin
Tried to apply some a solution from #4281 by importing globals.js

Steps to Reproduce

I have added the code at codesandbox https://codesandbox.io/s/871o94jn9

Error

jQuery.Deferred exception: FancyProductDesigner is not defined 
componentDidMount

Let me know your thoughts,
Thanks

[petetnt]

Hi rfdc,

sadly we don't support customization of Webpack configs. Check https://github.com/timarney/react-app-rewired on how to customize react-scripts if needed, although we cannot provide support for it.

That said you probably need to copy the files manually to the public folder in your case to work properly with globals.js.