I'm using RxJS6 in Undux, via typed-rx-emitter. I use it by importing Observable, and calling Observable.create. I don't use any other Rx methods.

Bundling Undux (+typed-rx-emitter, +rxjs) in as part of undux-todomvc, I see all sorts of things included in the bundle that I'm not using. Eg:

• CombineLatestOperator
• MergeMapOperator
• MapOperator
• RaceOperator
• ZipOperator
• AsyncSubject
• BehaviorSubject
• Subject
• ReplayEvent
• AsapScheduler
• VirtualTimeScheduler
• ForkJoinSubscriber
• ZipBufferIterator

All in all, that's ~80kb (unmangled). Even after running the code through Uglify's tree shaker, these are included. Are they core parts of Rx.Observable.create? Is there a way to remove them? Am I doing something wrong when bundling?

Repro:

Generated bundle.js (after Uglify)

Uglify options:

new UglifyJsPlugin({
  cache: true,
  parallel: true,
  sourceMap: true,
  uglifyOptions: {
    keep_classnames: true,
    keep_fnames: true,
    mangle: false
  }
})