What npm commands are run on deploy

Could someone clarify what npm commands are run when `slc deploy` is ran. We use the `slc build --scripts` to build the app, and then do `slc deploy` to deploy it. We however found that npm install is failing  during deploy every time, but doing `npm install` manually on the new directory under `../work` has no problems.

Would it be possible to document all the steps that `slc deploy` runs?
