I'm working on a form and have a property that will be one of several types. I created this custom type for the property.

export type IngredientDataGroupType =

    FormGroup< FlourProfileGroup >   |
    FormGroup< SaltProfileGroup >    |
    FormGroup< SugarProfileGroup >   |
    FormGroup< GrainProfileGroup >   |
    FormGroup< NutProfileGroup >     |
    FormGroup< SpeciesPrimative >    |
    FormGroup< DairyProfileGroup >   |
    FormGroup< ProduceProfileGroup > |
    FormGroup< OilProfileGroup >     |
    FormGroup< HerbProfileGroup >    |
    FormGroup< ExtractProfileGroup > |
    FormGroup< SweetenerProfileGroup >;

I apply this type to an @Input() in my component and started to set up an @switch statement in my template file to toggle the appropriate component. I also have another @Input() for passing in a value to determine which @case to return. Seeing that all my Profile components are strictly typed none of the will accept type IngredientDataGroupType which means I have to return the data as the type the component accepts. Instead of bloating my component by handling it like this.

export class MyComponent {

    @Input() Control!     : IngredientDataGroupType;
    @Input() ProfileType! : IngredientProfileType;



    flourProfile() : FormGroup< FlourProfileGroup > {

        return this.Control as FormGroup< FlourProfileGroup >;

    }

    saltProfile() : FormGroup< SaltProfile > {
    
        return this.Control as FormGroup< SaltProfile >;
    }

    // etc. etc. for each profile

}

So instead I figured I'd do this

export class MyComponent {

    @Input() Control!     : IngredientDataGroupType;
    @Input() ProfileType! : IngredientProfileType;



    getControl< GroupType extends Record< string, AbstractControl< any, any > > >() : FormGroup< GroupType > {

        return this.Control as FormGroup< GroupType >;

    }

}

and use it like this in my template

<section class="mainContainer"[formGroup]="Control">



    @if( Control !== undefined ) {

        @switch ( ProfileType ) {

            @case ( 'flour' ) {
                
                <lib-flour-profile
                    ngDefaultControl
                    [Control]="getControlGroup<FlourProfileGroup>()"
                />
            
            }

        }

    }



</section>

I'm getting a couple of errors, one in regards to the <lib-flour-profile /> component's [Control] input saying it can't accept type boolean, then one with the getControlGroup() method saying it's possibly undefined.

Why is the getControlGroup() method returning type boolean? This is just something I was trying to see if it would work, can we even infer types like this in the template? How can I go about achieving this type of functionality?