code: function genModuleGetter (instanceId) {
    var instance = instances[instanceId];
    return function (name) {
      var nativeModule = modules[name] || [];
      var output = {};
      var loop = function ( methodName ) {
        output[methodName] = function () {
          var args = [], len = arguments.length;
          while ( len-- ) args[ len ] = arguments[ len ];
  
          var finalArgs = args.map(function (value) {
            return normalize(value, instance)
          });
          renderer.sendTasks(instanceId + '', [{ module: name, method: methodName, args: finalArgs }], -1);
        };
      };
  
      for (var methodName in nativeModule) loop( methodName );
      return output
    }
  }
docs: Generate native module getter. Each native module has several
  methods to call. And all the behaviors is instance-related. So
  this getter will return a set of methods which additionally
  send current instance id to native when called. Also the args
  will be normalized into "safe" value. For example function arg
  will be converted into a callback id.
  @param  {string}  instanceId
  @return {function}