Immutable Flux Store example from Lee Byron (@leeb) from his React.js Conf 2015 talk

immutable-js-flux-store.js

var Immutable = require('immutable');
var todos = OrderedMap();

var TodoStore = createStore({
  getAll() { return todos; }
});

Dispatcher.register(function(action) {
  if (action.actionType === "create") {
    var id = createGUID();
    todos = todos.set(id, Map({
      id: id,
      complete: false,
      text: action.text.trim();
    }));
    TodoStore.emitChange();
  }
});

var TodoApp = React.createClass({ ...PureRenderMixin... });

Hi, I suppose you wanted to write (?)

var todos = Immutable.OrderedMap();
...