Dylan Hunn e49fc96ed3 feat(forms): Make Form Statuses use stricter types. (#42952)
Specifically: narrow the type used for form statuses from string to a union of possible statuses. Change the API methods from any to use the new type.

This is a breaking change. However, as discussed in the PR, breakage seems minimal, and google3 has been prepped to land this.

Background: we uncovered these any typings in the course of design work for typed forms. They could be fixed in a non-breaking manner by piggybacking them on top of the new typed forms generics, but it would be much cleaner to fix them separately if possible.

BREAKING CHANGE:

A new type called `FormControlStatus` has been introduced, which is a union of all possible status strings for form controls. `AbstractControl.status` has been narrowed from `string` to `FormControlStatus`, and `statusChanges` has been narrowed from `Observable<any>` to `Observable<FormControlStatus>`. Most applications should consume the new types seamlessly. Any breakage caused by this change is likely due to one of the following two problems: (1) the app is comparing `AbstractControl.status` against a string which is not a valid status; or, (2) the app is using `statusChanges` events as if they were something other than strings.

PR Close #42952
2021-08-04 16:28:20 -07:00
..
2021-02-22 12:37:40 -08:00

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