Imagine having a pair of functions like the following with identical return types:
private isFormArrayOrGroup(formControl: AbstractControl): formControl is UntypedFormGroup | UntypedFormArray
How can I create a type that is reusable for
formControl is UntypedFormGroup | UntypedFormArrayFurthermore, what is the appropriate naming convention for this type?
The following is not valid:
type FormType = formControl is UntypedFormGroup | UntypedFormArrayIf you want to create a specific type using the is expression, you'll need to define it as a return type annotation for a type predicate.
One way to achieve this is by creating a type alias for the union
UntypedFormGroup | UntypedFormArraytype UntypedFormType = UntypedFormGroup | UntypedFormArray;
Then, you can use it like so:
private isFormArrayOrGroup(formControl: AbstractControl): formControl is UntypedFormType
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