Example of dependency injection

dependency-injection-index.js

// more code

mediator.on('db.ready', (db) => {
  let rep
  // here we are making DI to the repository
  // we are injecting the database object and the ObjectID object
  repository.connect({
    db, 
    ObjectID: config.ObjectID
  })
  .then(repo => {
      console.log('Connected. Starting Server')
      rep = repo
      // here we are also making DI to the server
      // we are injecting serverSettings and the repo object
      return server.start({
        port: config.serverSettings.port,
        ssl: config.serverSettings.ssl,
        repo
      })
    })
    .then(app => {
      console.log(`Server started succesfully, running on port: ${config.serverSettings.port}.`)
      app.on('close', () => {
        rep.disconnect()
      })
    })
})

// more code