Minifying JS

optimizing-and-managing-a-chrome-extension-with-webpack-4.js

// ...

if (isDevelopment === false) {
  plugins = plugins.concat([
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false,
        screw_ie8: true,
        conditionals: true,
        unused: true,
        comparisons: true,
        sequences: true,
        dead_code: true,
        evaluate: true,
        if_return: true,
        join_vars: true,
      },
      output: {
        comments: false,
      },
    }),
  ]);
}
// ..