Trying to use 'X' before it has been initialized is not allowed

I have encountered an issue while attempting to create a child class within my parent class. Here is the code snippet:

class Stage {
    a() {
        return new ChestStage();
    }
}

Below is the child class code:

 class ChestStage extends Stage {
     constructor(){
        super();
     }
}

Unfortunately, I received the following error message:

Unhandled Promise rejection: Cannot access 'XModule' before initialization ; Zone: <root> ; Task: Promise.then ; Value: ReferenceError: Cannot access 'XModule' before initialization

The error seems to be related to the 'extends' keyword, as removing it resolves the issue. However, I am unsure of how to address this problem. Any suggestions or ideas would be appreciated.

Answer №1

Imagine if a method called a () is written directly in the ChestStage class without inheritance from the Stage class. It would look something like this:

class ChestStage {
  a() {
    return new ChestStage();
  }
}

This means that you are attempting to create an instance of ChestStage within a method of the ChestStage class itself... which is not possible.

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