webpack.optimize.UglifyJsPlugin has been removed, please use config.optimization.minimize instead

[wuweijia]

"webpack": "^4.25.1",

before

  plugins: [
    new webpack.optimize.UglifyJsPlugin({
      sourceMap: true,
      compress: {
        warnings: false,
      },
    }),
  ],

now

const UglifyJsPlugin = require('uglifyjs-webpack-plugin');

  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        sourceMap: true,
        compress: {
          warnings: false,
        },
      }),
    ],
  },