I am getting this error
Error:
webpack.optimize.CommonsChunkPlugin
has been removed, please useconfig.optimization.splitChunks
instead.
new webpack.optimize.CommonsChunkPlugin({
filename: DEBUG ? 'bundle.js' : 'bundle.min.js',
name: "vendor"
})
As the error states, the plugin is deprecated since webpack 4
You should remove it and use a different plugin.
There are plenty of posts where you can find how to do this but here is an example: Webpack 4 migration CommonsChunkPlugin