MongoDB backend - TypeError: <class>.injectDB is not a function

JavaScript
1 
import app from "./server.js"
import mongodb from "mongodb"
import dotenv from "dotenv"
import FBrainUsersDAOs from "./dao/fBrainUsersDAO.js"
dotenv.config()
const MongoClient = mongodb.MongoClient;

const port = process.env.PORT || 8000

MongoClient.connect(process.env.FB_USERS_DB_URI, {
    maxPoolSize: 50,
    wtimeoutMS: 2500,
    useNewUrlParser: true,
})
  .catch((err) => {
      console.error(err.stack);
      process.exit(1);
  })
    .then(async client => {
        console.log(FBrainUsersDAOs.injectDB(client))

        await FBrainUsersDAOs.injectDB(client);
        app.listen(port, () => {
            console.log(`listening on port ${port}`);
        });
    });

Here’s the error message:
image

File structure:
image

2

For context

3

Thanks. I wrote it as the other thread was getting too long. Thanks for replying here as well.

4

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