App1:
  module: app1.database
  class: Database
  other_kwargs: value
  dependencies: Sound

App1Foo:
  module: app1.subdir.foo
  class: Foo
  # dependencies:
  #   - companion_app

App2:
  module: app2.database
  class: OtherDatabaseApp
  dependencies:
    - App1
    - App1Foo
    - globals

App3:
  module: app2.database
  class: OtherDatabaseApp
  dependencies:
    - App2