Angular

Circular dependency in DI detected Error in Angular


Usually in Angular, a circular dependency occurs when two or more services or components depend on each other, either directly or indirectly, causing a loop. This can create issues during the Dependency Injection (DI) process, leading to errors and breaking the application.

Why Does It Happen?

1. Circular dependencies typically arise when Service A depends on Service B, and Service B, in turn, depends on Service A.

2. This makes it impossible for Angular's DI system to resolve the dependencies, as it keeps trying to inject Service A into Service B and vice versa

Ensure layout recalculations in response to resize events do not recursively trigger additional resize events.

Error Example:

ERROR Error: Uncaught (in promise): Error: NG01203: Circular dependency in DI detected

How to Identify Circular Dependencies:

1. Look at the error logs in the browser’s console, where Angular will indicate which services are involved in the circular dependency.

2. You can also use third-party tools like madge to visually represent dependencies in your project.

How to Fix Circular Dependency:

1. Refactor the Code.

2. Use Injector for Lazy Dependency Injection.

3. Abstract the Dependency.

4.Lazy Loading.

Summary

Circular dependencies should be avoided in Angular DI to ensure the stability of your application. Refactoring and proper design patterns can help in preventing or resolving circular dependency errors.

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