prismy-di

[Rokt33r]

Implement dependency injection decorator

import { BaseInject, createInjector } from 'prismy-di'

const PRODUCTION = process.env.NODE_ENV === 'production'

const ServiceTypes = {
  MailService: 'MailService',
  NotificationService: 'NotificationService'
}

abstract class MailService {
}

class LiveMailService implements MailService {
}

class MockMailService implements MailService {
}

class NotificationService {
  constructor(@BaseInject(ServiceTypes.MailService) mailer: MailService) {
    ...
  }
}

const container = {
  [ServiceTypes.MailService]: PRODUCTION ? LiveMailService : MockMailService,
  [ServiceTypes.NotificationService]: NotificationService
}

const {
  Inject,
  injector
} = createInjector(container)

class MyHandler {
  handle(@Inject(ServiceTypes.NotificationService) notifier: NotificationService) {
    ...
    // Or
    const notifier = injector.inject(ServiceTypes.NotificationService)
    // Or
    const notifier = injector.instantiate(NotificationService)
  }
}

[Rokt33r]

Maybe we don't need decorators.

See https://github.com/jeffijoe/awilix