build project with ivy enabled

[SourceCodeBot]

help wanted, question

using ivy enabled and form typed
export type RecipeForm = Omit<Recipe, 'id'>;
cause in prod build the following error

ERROR in .../component.html(1,7): Type 'FormGroup<Pick<Recipe, "title" | "parts" | "description" | "duration">>' is missing the following properties from type 'FormGroup': _parent, _asyncValidationSubscription, _updateAncestors, _setInitialStatus, and 4 more.

source line is <form [formGroup]="form">

and the necessary code parts are
public form: FormGroup<RecipeForm>;
and
this.form = new FormGroup({ title: new FormControl<string>('', [ Validators.required, Validators.maxLength(100) ]), description: new FormControl<string>('', Validators.required), duration: new FormControl(null) });

is this error in ivy or this project?
without ivy enabled in tsconfig.app.json it build fine.

[SourceCodeBot]

see package.json and yarn.lock
gist

[no0x9d]

First off, sorry for the late reply.
I have an idea what causes this error. There are private fields on the Angular classes I didn't include in my type definitions. It seems that Ivy has stronger type checking in Templates than the current compiler and are not longer compatible.
I will try to find a solution for this problem

[no0x9d]

I did some research on this problem. It seems that Ivy has stronger compile time type checking than the aot build before. Because I don't inherite from the Angular classes my types are not compatible. For more information a see the TS documentation
The main problem here is, that I can't inherite from two classes, eg. my FormControl has to inherite from my AbstractControl<> and from Angulars FormControl.
I'll try to get a inheritance hierarchy without breaking changes or loosing type safety, or finding another way.

[SourceCodeBot]

dear @no0x9d,
thanks for reply and researching.
I hope you could find a good way to solve this problem.
I'll also try to find a solution

[RohanHart]

In Angular 9-rc.1 this error only occurs in the strictest typecheck mode, ie., with strictTemplates: true

[RohanHart]

Potential fix in #26 or more radically #27