How to organise your schema/structure for large apps?

[kod-man]

I want to have a structure as shown below.

src
├── schema
│   ├── user
│   │   │    index.js(it has its own resolver, types, queries, and mutations)
│   ├── order
│   │   └── index.js((it has its own resolver, types, queries, and mutations))
│   └── index.js
└── app.js

I mean, I want to handle all user-related types, queries and other stuff in its own file.

But how can I combine user types and resolvers with orders resolvers and types?