I am running into the same issue, the TerserPlugin pointed to by Andrew Mackie's link will address the issue, but is also a pretty heavy solution. One option would be changing how the optimization setting in webpack works. A convenient approach (without having given in huge thought) would be:

optimization: {

  minimize: true|false|"compress"|"preserve"

}

"compress" would remove white space but not mangle
"preserve" would minimize but not mangle function and class names

Here is the Terser configuration for webpack.conf:

optimization: {

    minimize: true,

    minimizer: [

        new TerserPlugin({

            terserOptions: {

                keep_classnames: true,

                keep_fnames: true

            }

          })

        ]

  },