Contrived JS DI

contrived-di-example.js

const User = require('./db/user');


const interface = {
  find(id) {},
  update(id, data) {}
}

// index.js or main.js
// const userRoute = requrie('./routes/users');

const mongo = {
  find(id) {},
  update(id, data) {}
}

const firestore = {
  find(id) {},
  update(id, data) {}
}

const userRoutes = userRoute(firestore);
router.get('/users', userRoutes.getUser);

module.exports = function (database) {
  return {
    async getUser(req, res) {
      const user = await database.find(req.body.id);

      // logic to compute inventory

      database.update();

      return res.json({
        user
      });
    }
  }
}