Error when trying to inject a service into an angular component “EXCEPTION: Can't resolve all parameters for component”, why?

Question

I\'ve built a basic app in Angular, but I have encountered a strange issue where I cannot inject a service into one of my components. It injects fine into any of the three o

Answer 1

In my case, I was exporting a Class and an Enum from the same component file:

mComponent.component.ts:

export class MyComponentClass{...}
export enum MyEnum{...}

Then, I was trying to use MyEnum from a child of MyComponentClass. That was causing the Can't resolve all parameters error.

By moving MyEnum in a separate folder from MyComponentClass, that solved my issue!

As Günter Zöchbauer mentioned, this is happening because of a service or component is circularly dependent.