Do I need to use lerna in my own project ?

Although the LuciadRIA distribution ships with a lerna.json file, there is no need to use lerna in your own projects. The Hello world: create your first LuciadRIA based app illustrates how LuciadRIA is added to a project, without lerna.

The lerna.json file is included in the LuciadRIA distribution to allow you to edit the LuciadRIA sample code. For more information, see the Explore and edit the sample code tutorial.