Angular FormControl is a built-in class that belongs to the Angular forms module. It

I’ve been working on adjusting tslint for the proper return type, and here’s what I have so far:

 get formControls(): any {
    return this.form.controls;
  }

However, I encountered an error stating Type declaration of 'any' loses type-safety. Consider replacing it with a more precise type.

In a previous inquiry on FormControl type angular typescript, I received guidance to modify it as follows:

 get formControls(): { [key: string]: AbstractControl } {
    return this.form.controls;
  }

This adjustment resolved the issue in that specific case, but now I’m facing difficulties with other functions within the component due to similar declarations like these:

  get addressFormControls(): any {
    return this.formControls.address.controls;
  }

  get addressFormGroup(): any {
    return this.formControls.address;
  }

As a result, I’m encountering another error – Property 'controls' does not exist on type 'AbstractControl'

Below is my revised code snippet. Would appreciate any assistance in defining the proper return type:

  get formControls(): { [key: string]: AbstractControl } {
    return this.form.controls;
  }

  get addressFormControls(): any {
    return this.formControls.address.controls;
  }

  get addressFormGroup(): any {
    return this.formControls.address;
  }

Thank you in advance for any help provided.

Answer №1

It's clear that an error will occur in that situation.

AbstractControl serves as the foundation class for FormGroup, FormArray, and FormControl.

FormGroup and FormArray have a control property which is not present in FormControl or AbstractControl.

According to Angular definitions, if we define a form of type FormArray, then formControls() should return an array of AbstractControls.

get formControls(): AbstractControl[] {
  return this.form.controls;
}

However, if the form is a FormGroup, then the return type as you mentioned is correct.

get formControls(): { [key: string]: AbstractControl } {
  return this.form.controls;
}

Since AbstractControl doesn't have a controls property, we can manually cast it to FormGroup. This approach would resolve the issue.

get addressFormControls(): { [key: string]: AbstractControl } {
  return (this.formControls.address as FormGroup).controls;
}

get addressFormGroup(): FormGroup {
  return this.formControls.address as FormGroup;
}

Update: I recommend refactoring it as follows:

get addressFormControls(): { [key: string]: AbstractControl } {
  return this.addressFormGroup.controls;
}

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