/Javascript/AngularJS/Angular observer if not length

Angular observer if not length

<div>
    Length: {{(list$ | async)?.length}}
    <div *ngIf="(list$ | async)?.length>0">
        <ul>
            <li *ngFor="let item of (list$ | async)">
                {{item.firstName}}
            </li>
        </ul>
    </div>
</div>

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