docs: function (instruction, evaluator, context) {
          return Promise
              .resolve(evaluator.call(context, instruction))
              .then(function () {
              if (!('viewPorts' in instruction.config)) {
                  instruction.config.viewPorts = {
                      'default': {
                          moduleId: instruction.config.moduleId
                      }
                  };
              }
              return instruction;
          });
      }