old_contents: """Project signals."""
  
  import django.dispatch
  
  
  before_vcs = django.dispatch.Signal(providing_args=['version'])
  after_vcs = django.dispatch.Signal(providing_args=['version'])
  
  before_build = django.dispatch.Signal(providing_args=['version'])
  after_build = django.dispatch.Signal(providing_args=['version'])
  
  project_import = django.dispatch.Signal(providing_args=['project'])
  
  # Used to force verify a domain (eg. for SSL cert issuance)
  domain_verify = django.dispatch.Signal(providing_args=['domain'])
  
new_contents: """Project signals."""
  
  import django.dispatch
  
  
  before_vcs = django.dispatch.Signal(providing_args=['version'])
  after_vcs = django.dispatch.Signal(providing_args=['version'])
  
  before_build = django.dispatch.Signal(providing_args=['version'])
  after_build = django.dispatch.Signal(providing_args=['version'])
  
  project_import = django.dispatch.Signal(providing_args=['project'])
  
  # Used to purge files from the CDN
  files_changed = django.dispatch.Signal(providing_args=['project', 'files'])
  
  # Used to force verify a domain (eg. for SSL cert issuance)
  domain_verify = django.dispatch.Signal(providing_args=['domain'])
  
subject: Bring back files_changed signal