How to create a monorepo?

[nojaf]

Rewatch opens the door to use monorepos.
But what are the ReScript specific bits to make this work?

I'm happy to contribute a section on this, but I don't quite grasp the execution yet.

@jfrolich or @Bushuo could you give me some steps?

Do I install ReScript in the top-level package.json?
Do I have a top-level rescript.json?

Do I add stuff like this in the top-level rescript.json?

  "package-specs": {
    "module": "esmodule",
    "in-source": true
  },
  "suffix": ".res.mjs",

will the packages inherit this?