Add features and properties dynamically to a resource type

package_settings.rb

# lib/puppet/backport/type/package/package_settings.rb

package = Puppet::Type.type(:package)
unless package.features.include? :package_settings
  package.feature :package_settings ...
  package.newproperty(:package_settings, :required_features=>:package_settings) do
  ...
  end
end

portsng.rb

# lib/puppet/provider/package/portsng.rb

require 'puppet/backport/type/package/package_settings' # "dynamically" add 'package_settings' to 'package' resource

Puppet::Type.type(:package).provide :portsng, :parent => Puppet::Provider::Package do
...
end