Comments (1)
The group
method has two type signatures:
group<T extends {}>(controls: T, options?: AbstractControlOptions|null): FormGroup<{[K in keyof T]: ɵElement<T[K], null>}>;
group(controls: {[key: string]: any}, options: {[key: string]: any}): FormGroup;
I assume you're referring to the second signature. Tragically, this was actually the original signature shipped with Angular 2, and we are stuck supporting it to avoid breaking a ton of old code.
Note also that the options
argument has a different shape as well, which is the root of the evil:
* @deprecated This API is not typesafe and can result in issues with Closure Compiler renaming.
* Use the `FormBuilder#group` overload with `AbstractControlOptions` instead.
* Note that `AbstractControlOptions` expects `validators` and `asyncValidators` to be valid
* validators. If you have custom validators, make sure their validation function parameter is
* `AbstractControl` and not a sub-class, such as `FormGroup`. These functions will be called
* with an object of type `AbstractControl` and that cannot be automatically downcast to a
* subclass, so TypeScript sees this as an error. For example, change the `(group: FormGroup) =>
* ValidationErrors|null` signature to be `(group: AbstractControl) => ValidationErrors|null`.
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