How do I deploy a shared monorepo?

Question

I'm not using anything like turborepo, workspaces, pnpm, etc.

My project structure looks like this

```
/_shared
/client
/server
  /dist
  /src
  package.json
```

`_shared` are common files like types and utils that both `client` and `server` uses. I'm not concern about deploy `client` because I'm using vercel for that. I'm trying to deploy `server`, but if I set the root to `server`, it cannot access files in `_shared`. If I don't set a root, I think I was getting an error that it doesn't know how to build my app. If I put into the build command something like `cd server && npm i && npm run build`, I get `npm: command not found`. If I leave the build command blank, it says it doesn't know how to build my app. The only way it will build is if I set root directory to `server`.

So what do I have to do to deploy `server`?