Why cannot see any code completion after imported an EmberObject extension into a different file, using Visual Studio Code?

As already explained in the title, I can't see any code completion after imported an EmberObject extension

• file form.js:

  import EmberObject from '@ember/object'; 
  
  const Form = EmberObject.extend({
          isTouched: false,
          isValid: false,
          errors: null,
          value: null,
          init() {...},
          getSomething(){ ... }  
  }
  
  

• file component.js

  import Form from '../../classes/form';
  
  init() {        
   this._super(arguments);        
   // console.log(this.elementId);        
   this.form = Form.create({          
       email: [this.email, Validators.required, Validators.email],
       password: [this.password, Validators.required]         
   });
  }
  
  

at this point in component.js when I type this.form. the editor (VSC) doesn't give me any real suggestion on Form class/EmberObject

Any guess?