Using of external es6 module inside angular component

Question

I have new angular cli project that created using ng new and i extract the webpack configuration using ng eject.

So now i have an external es6 module and i want to use it inside one of my components.

Let us assume the project structure like this: src\app\customModule this folder has two files myModule.ts, myModule2.ts.

I have create new entry point and chunk for this module and call it customeModule and make sure it downloaded before the main chunk.

Here is myModule.ts file:

module MyModule{
    export interface CarProperties {
          name:string;
          price:number;
    }

    export enum CarType{
          BMW,
          Hyundai
    }
}

And myModule2.ts file:

module MyModule{
    export class Car {
         private speed:number;

         constructor(){
              console.log("New car has been initialized");
         }
    }
}

So Assume i will use it in app.component.ts:

ngOnInit(){
   console.log(MyModule);
}

Once i run npm run start or npm run build, i saw the new chunk with the network tab but still get MyModule is undefined

Any suggestions ? Thanks in advance :)