Communication between Angular services and the issue of 'circular dependency detected' alerts

I am encountering a circular dependency issue with my AuthenticationService and UserService. The UserService is included within the AuthenticationService, but when I try to use AuthenticationService in UserService as shown below:

constructor(private authService: AuthenticationService){}

An error message stating "Circular dependency detected" appears, pointing to the relationship between src/app/core/authentication/authentication.service.ts, src/app/shared/services/user.service.ts, and src/app/core/authentication/authentication.service.ts. Both services are declared in the app module providers array, so I am confused as to why this circular dependency is occurring. Can anyone shed light on this for me?

angulartypescriptcircular-dependency

Answer №1

A situation has arisen where you have injected AuthenticationService into UserService, and then attempted to inject UserService back into AuthenticationService. This is not a recommended practice!

These circular dependencies occur when files are importing each other either directly or indirectly. While this is common in software development, it can lead to various unpredictable outcomes. Although it may not always result in an error, it's crucial to address because potential issues may arise depending on the specific use case.

In most cases, it is possible to refactor your code to eliminate circular dependencies. Therefore, while this serves as a warning, it is advisable to steer clear of such patterns for better code maintainability.

To remove this warning, consider adding showCircularDependencies to your .angular-cli.json file as shown below:

 "defaults": {
    "build": {
      "showCircularDependencies": false
    }
  }

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