On how to build guide it references *While building your module can be useful in some cases, most of the time you won't need to build it on your own: the playground takes care of it while developing, and the release script also has you covered when publishing. *
The case is that i'm not publishing to npm and i want to use the module only for my own project. However when i deploy the main app ( with the module inside ) it seems everything works fine. So does that mean nuxt does that on it's own when building the main app or do i have to add a command to build the module before using?