How to handle boolean observables with the async pipe in Angular

Here's a way where you can share the subscription and not have to make any custom pipe:

<ng-container *ngIf="{value: obs$ | async} as context">
    {{context.value}}
</ng-container>

The *ngIf will evaluate to true no matter what (I believe) and then you can do your own tests on the value in the context object.

...would be better if they would just implement *ngLet I think!

The thing I like about this solution is that the resulting value is reusable with only the single use of an async pipe and its still pretty concise (even if it isn't perfect).

You can do (obs$ | async) !== null