Javascript error only happens when uglify mangle is false

Question

This javascript error

Super expression must either be null or a function, not undefined

Is only thrown when webpack mode is set to production, which I've narrowed down to UglifyJsPlugin > uglifyOptions > compress.

Has anybody experienced this issue? Or have a suggestion on where to look?

user_9219318 · Answer

new UglifyJsPlugin({
        uglifyOptions: {
          compress: {
            inline: false,
          },
        },
      }),