Example of dependency injection registration

di.js

const { createContainer, asValue, asFunction, asClass } = require('awilix')

function initDI ({serverSettings, dbSettings, database, models, services}, mediator) {
  mediator.once('init', () => {
    mediator.on('db.ready', (db) => {
      const container = createContainer()
      
      // loading dependecies in a single source of truth
      container.register({
        database: asValue(db).singleton(),
        validate: asValue(models.validate),
        booking: asValue(models.booking),
        user: asValue(models.booking),
        ticket: asValue(models.booking),
        ObjectID: asClass(database.ObjectID),
        serverSettings: asValue(serverSettings),
        paymentService: asValue(services.paymentService),
        notificationService: asValue(services.notificationService)
      })
      
      // we emit the container to be able to use it in the API
      mediator.emit('di.ready', container)
    })

    mediator.on('db.error', (err) => {
      mediator.emit('di.error', err)
    })

    database.connect(dbSettings, mediator)

    mediator.emit('boot.ready')
  })
}

module.exports.initDI = initDI

Hello,

I have implemented this example and everything works great except for the fact that I cannot set my DB to a singleton. I get:

(node:94072) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): TypeError: (0 , _awilix.asValue)(...).singleton is not a function(node:94072) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Any ideas what's going on here?

Thanks!