build_directives

# File actionpack/lib/action_dispatch/http/permissions_policy.rb, line 178
      def build_directives(context)
        @directives.map do |directive, sources|
          if sources.is_a?(Array)
            "#{directive} #{build_directive(sources, context).join(' ')}"
          elsif sources
            directive
          else
            nil
          end
        end
      end