[Question] @Constant/@Value are not available inside the constructor

[ktalebian]

Information

• Version: 7.34.2
• Packages:

When using @Constant or @Value to inject the configuration into a client/service, the value is undefined inside the constructor.

Example

For example, I have

@Service()
export class GoogleClient {
  @Constant('sso.google')
  config: GoogleSSOConfig;

  constructor() {
    console.log(this.config);
  }

  doSomething() {
    console.log(this.config);
  }

In the example above, when the app boots, the constructor prints undefined but when I call doSomething() the config value exists. How come?

Acceptance criteria

• Criteria 1

[Romakita]

Hello @ktalebian

It's an intended behavior. Decorators used on properties like Constant/Value/Inject are filed by the injector service after the construtor. All props are filled before the $onInit hook.

If you need settings on constructor just inject the Configuration service:

construtor(settings: Configuration){
  const value = settings.get<string>('myValue');
}

Is equivalent of:

export class MyService {
  @Constant('myValue')
  value: string;

  $onInit(){
    console.log(this.value)
  }

See you
Romain

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