Dependency Injection - Issue with Object containing AuthService instead of Instance of AuthService

[RoyalVICTOR-pro]

Hello, I'm starting to develop an API using AdonisJS. I've created a very first feature that allows creating a user. Initially, I developed this user creation using a classic and straightforward method: a route that calls a method from an AuthController, the controller calls an AuthService, the service calls the UserRepository responsible for creating the user. So far, no problems.

Then, for more flexibility, I wanted to use dependency injection, and that's where things got tricky.
I believe I've managed to implement 98% of what was needed, but I can't seem to make it work.

Here in the attached images are the changes I made to implement dependency injection; there must be an error somewhere or something missing.

When I run 'npm run dev', there's no issue, but as soon as I try to create a user with PostMan, I get the following error message:

error:>> TypeError: this.authService.createUserAccount is not a function
at AuthController.register (app\Controllers\Http\AuthController.ts:32:43)
at processTicksAndRejections (node:internal/process/task_queues:95:5)
at Object.PreCompiler.runRouteHandler [as fn] (node_modules@adonisjs\http-server\build\src\Server\PreCompiler\index.js:47:31)
at Server.handleRequest (node_modules@adonisjs\http-server\build\src\Server\index.js:108:13)

The console log at line 31 of AuthController indicates:
this.authService:>> { AuthService: [class AuthService] }

So, we can see that 'AuthService' is an object containing a class, rather than an instance of the 'AuthService' class."

Thank you for your help!

Furthermore, I had a lot of difficulty setting up this code. I read various blog articles, asked ChatGPT, Bard, Claude, and searched for similar projects on Github. If there are errors in my code or if there's a simpler way to implement dependency injection in AdonisJS, I'd be very interested. Thanks again for your help! And keep up the great work with this framework; it looks fantastic!

[RoyalVICTOR-pro]

I finally managed to find what was wrong in my code. There were 2 errors in the AppProvider.ts file:

I needed to use AuthService, not the AuthService interface in the singleton.
And there was an unnecessary 'async'."

Here's the incorrect code:

this.app.container.singleton('App/Services/ServicesContracts/AuthServiceContract', async () => {  
      const userRepository = this.app.container.use('App/DataAccessLayer/DALContracts/UserContract')  
      return new AuthService(userRepository)  
})  

Here's the corrected code (only the first line):

this.app.container.singleton('App/Services/AuthService', () => {
     const userRepository = this.app.container.use('App/DataAccessLayer/DALContracts/UserContract')
     return new AuthService(userRepository)
})