Circular Dependencies in NestJS and How to Prevent Them
So, you encounter a scenario where you're developing your NestJS server application smoothly, only to be interrupted by an error message like this: [ Nest ] 116557 - 10 /07/2022, 2 :12:40 PM ERROR [ ExceptionHandler ] Nest cannot create the BarModule instance. The module at index [ 0 ] of the BarModule "imports" array is undefined. Potential causes: - A circular dependency between modules. Use forwardRef ( ) to avoid it. Read more: https://docs.nestjs.com/fundamentals/circular-dependency - The module at index [ 0 ] is of type "undefined" . Check your import statements and the type of the module. Scope [ AppModule - > FooModule ] You pause, analyze the situation, and realize that adding a forwardRef to your BarModule and FooModule imports might resolve the issue, correct? Nest can't resolve dependencies of the FooService ( ? ) . Please make sure that the argument dependency at index [ 0 ] is available in the FooModule context. Potenti...