abstraction.js

import mongo from 'mongo';

export default function myDB(dbConn) {
  return {
    connect() {
      return mongo.connect()
    },
    getData() {
      return mongo.getSomething()
    },
    getSchema() {
      return mongo.getSchema()
    }
  };
} 

// my route
export default function createMetadataRoute(dB) {

  router.get('./', async () => {

    const data = await dB.getData();
  });

  return router;
}

// in my "main" process

import myDb from './myDb';
import createMetadataRoute from '../createMetadataRoute'

(async function() {
  const db = await myDb.connect();
  const route = createMetadataRoute(dB)
})();