Module questions / "interface" functionality

Hello @elias-michaias and welcome to ReScript!

Thank you for your kind word about ReScript.

For your first question, another way to solve it is to break down your main modules into packages inside a monorepo and use namespace in rescript.json.

{
  // ...
  "namespace": "MyLib1"
  // ... 
}

For your second question, another solution is to include the module type:

module type Foo = {
  type t = string
}

module Bar: {
  include Foo
  let baz: int => int
} = {
  type t = string
  // "extra" functionality
  let baz = x => x + 2
}

Bar.baz(4)->ignore
// no error anymore