def flat_arguments
      args = []
      @config['flow'].each do |_, steps|
        steps.each do |s|
          (args << s['arguments'].keys).flatten! unless s['arguments'].nil?
        end
      end
      args.uniq
    end
def flat_arguments
      args = []
      @config['flow'].each do |_, steps|
        steps.each do |s|
          (args << s['arguments'].keys).flatten! unless s['arguments'].nil?
        end
      end
      args.uniq
    end
Public: Get flat arguments from flow.

 TODO: Move to a normal object: TriggerArgument

 Returns flat Array of arguments.