Inversifyjs: Typescript: property not initialized warning when using property injection

[annajolly]

I am trying to inject a service as a property into a class outside of the constructor (since this particular class requires an empty constructor) as below:

@injectable()
export class CustomAuthProvider implements interfaces.AuthProvider {

  @inject(AUTH_TYPES.AUTH_SERVICE)
  private readonly _authService: AuthService;

}

This gives the TS error: Property "_authService" has no initializer and is not definitely assigned in the constructor

I am curious if anyone has run into this issue and found a way around it. It would appear that the typescript compiler is throwing a warning because it doesn't know that the @inject decorator is going to provide the auth service, but as my testing confirms, the property injection is working as expected. Thanks in advance!

[gejgalis]

@annajolly have you tried with ! ?
@inject(AUTH_TYPES.AUTH_SERVICE) private readonly _authService!: AuthService;

[dcavanagh]

@annajolly another option in addition to @gejgalis would be to inject the service in the constructor.

@injectable()
export class CustomAuthProvider implements interfaces.AuthProvider {

  constructor(@inject(AUTH_TYPES.AUTH_SERVICE) private readonly _authService: AuthService) {}

}

[dcavanagh]

@annajolly I am going to close this. Please reopen if you have more problems

[annajolly]

@dcavanagh @gejgalis Yes, I ended up using !, thank you!

[linonetwo]

I get Unable to resolve signature of parameter decorator when called as an expression.ts(1239)

When using it like:

  constructor(@lazyInject(serviceIdentifiers.Window) private readonly windowService: Window) {
    this.cachedPreferences = this.getInitPreferencesForCache();
  }

Why?

While this is good:

constructor(@inject(serviceIdentifiers.Preference) private readonly preferenceService: Preference) {}

---

I ended up using !, too...