TypeError: webpack.optimize.UglifyJsPlugin is not a constructor

This is in webpack@4.0.0-beta.0

Do you want to request a feature or report a bug?

bug

What is the current behavior?

TypeError: webpack.optimize.UglifyJsPlugin is not a constructor

If the current behavior is a bug, please provide the steps to reproduce.

const webpack = require('webpack');
new webpack.optimize.UglifyJsPlugin()

Also:

$ npm i webpack@4.0.0-beta.0
$ node -e 'console.log(require("webpack").optimize)'

{ AggressiveMergingPlugin: [Getter],
  AggressiveSplittingPlugin: [Getter],
  ChunkModuleIdRangePlugin: [Getter],
  LimitChunkCountPlugin: [Getter],
  MinChunkSizePlugin: [Getter],
  ModuleConcatenationPlugin: [Getter],
  OccurrenceOrderPlugin: [Getter],
  RuntimeChunkPlugin: [Getter],
  SideEffectsFlagPlugin: [Getter],
  SplitChunksPlugin: [Getter] }

What is the expected behavior?

webpack.optimize.UglifyJsPlugin === function

Please mention other relevant information such as the browser version, Node.js version, webpack version and Operating System.

❯ node v8.6.0 ❯ npm 5.6.0 ❯ webpack 4.0.0-beta.0

[fregante]

Any docs available for config.optimization.minimize? Google brings up zero results.

Also it’d be nice to include a friendly message about this in webpack itself because plenty of people will be hitting that error.

[backflip]

I was using an outdated structure, the config needs to be wrapped with uglifyOptions:

optimization: {
  minimizer: [
    new UglifyJSPlugin({
      uglifyOptions: {
        mangle: {
          keep_fnames: true,
        },
      },
    }),
  ],
},

Sorry for spamming.