Purging unmanaged yumrepo resources in puppet v3.5+

example.pp

# This was tested on puppet v3.6.1 but believe the fix was in v3.5

yumrepo { 'epel':
  ensure  => present,
  baseurl => 'http://whatever'
  ...
}

# This purges any yumrepo resource that isn't specified anywhere in manifest.
# On node run `puppet resource yumrepo` to get a list of all yumrepo resources
# puppet sees on node even if not defined in manifest
resources { 'yumrepo':
  purge => true,
}

# -----  IMPORTANT IMPORTANT IMPORTANT  -----
# do not purge the directory like this:
file { '/etc/yum.repos.d':
  ensure  => directory,
  force   => true,
  purge   => true,
  recurse => true,
}
# as that will remove all yumrepo resources. The fix pre v3.5 was to create file resources for each repo.
# that would still work but above method is better