extended diagnostic for non-nullable optional is wrong

Which @angular/* package(s) are the source of the bug?

core

Is this a regression?

No

Description

Having the case below produces the warning for optional chain operation. Because of ! it will always return a boolean to the input. Relates to the new feature https://github.com/angular/angular/pull/46686 https://github.com/angular/angular/issues/44870

Also can we have a angularCompilerOptions to disable this warnings?

First case:

optionalArrayElement: {a: 'value'}[] = [];

<button [disabled]="!optionalArrayElement[0]?.a"></button>

Second case:

enum MapKeys {
  A,
  B
}

 optionalMapElement: {[key: string]: {a: string}} = {[MapKeys.A] : {a: 'value'}};

<button [disabled]="!optionalMapElement[MapKeys.B]?.a"></button>

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/angular-r3n3ec?file=src/app/app.component.ts

Please provide the exception or error you saw

warning NG8107: The left side of this optional chain operation does not include 'null' or 'undefined' in its type, therefore the '?.' operator can be replaced with the '.' operator.

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 14.1.0
Node: 16.15.1
Package Manager: npm 8.13.2
OS: win32 x64

Angular: 14.1.0
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
... service-worker

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1401.0
@angular-devkit/build-angular   14.1.0
@angular-devkit/core            14.1.0
@angular-devkit/schematics      14.1.0
@schematics/angular             14.1.0
rxjs                            7.5.6
typescript                      4.7.4

Anything else?

No response

[e-oz]

An example of how to suppress this check right now (it’s not obvious from previous comments):

  "angularCompilerOptions": {
    "extendedDiagnostics": {
      "checks": {
        "optionalChainNotNullable": "suppress"
      }
    }
  }

[JoostK]

I’d also like to turn off this warning.

"angularCompilerOptions": {

    "strictNullChecks": false

  }

Please do not do this. strictNullChecks is not an Angular compiler option, and disabling the TypeScript option is definitely not recommended.

This particular rule can be disabled like any other extended diagnostic, as documented here: https://angular.io/extended-diagnostics#configuration. The rule name is optionalChainNotNullable, which is currently not yet included in the docs.