We go to our terminal, in our app's folder and run the following command:

$ meteor create --package reactive-timer

This will create a folder named packages with a reactive-timer folder inside it. Inside the reactive-timer folder, Meteor has already created a package.js file and some example package files.

Now we can delete all the files inside the reactive-timer folder, except the package.js file.

Then we move the my-meteor-blog/client/ReactiveTimer.js file, which we created in Chapter 9, Advanced Reactivity, to our newly created reactive-timer package folder.

Lastly, we open the copied ReactiveTimer.js file and remove the following lines:

timer = new ReactiveTimer();
timer.start(10);

Later, we'll instantiate the timer object inside the app itself and not in the package file.