code: func (app Application) CalculatedBuildpacks() []string {
  	buildpack := app.CalculatedBuildpack()
  	switch {
  	case app.Buildpacks != nil:
  		return app.Buildpacks
  	case len(buildpack) > 0:
  		return []string{buildpack}
  	default:
  		return nil
  	}
  }
docs: // CalculatedBuildpacks will return back the buildpacks for the application.