Does a VS code plugin have the ability to update the workspace watch exclusion list? As more users migrate to build_runner we'll have more occurrences of this directory with lots of files and excluding it can prevent the editor from picking up too many file watchers which are a limited resource.

See https://gitter.im/dart-lang/angular?at=5aba15b9e4ff28713a7aeb6e

If we can't do it automatically should we document it somewhere?