Webpack V4: Remove console.logs with Webpack & Uglify

You're still putting it in config.plugins, have you tried putting it in config.optimization.minimizer?

const UglifyJSPlugin = require('uglifyjs-webpack-plugin')

...

optimization: {
  minimizer: [
    new UglifyJSPlugin({
      uglifyOptions: {
        compress: {
          drop_console: true,
        }
      }
    })
  ]
}