anchor.diff:  
   Then in the same file, we will add two {url-meteor}[Meteor] methods, one to add a Todo and another to switch the status of Todo with its ID:
   
  -```ts
  +```js
   Meteor.methods({
     "todos.addTodo"(value: string) {
       if (value !== "") {
  
positive.code: Finally we need to send todos everytime the collection change.
  To do that, we use `Tracker.autorun` that will run the callback when necessary.
  
  ```ts
    // We use the Tracker.autorun to send todos each time the fetch result
    // changes
    Tracker.autorun(() => {
  
negative.code: 
  In the *client/main.ts* file, add the following code:
  
  ```js
  import { init } from "meteor/elm-app";
  import { Meteor } from 'meteor/meteor';
  
  