oob swap via extension fails if parent had [hx-swap]="outerHTML" about htmx-signalr HOT 2 OPEN

Do you by any chance use web components or some JS lib? I'm completely unable to reproduce Error: A callback for the method 'component-update'

As for subscription not working after first swap, this is a legitimate bug, but it doesn't seem to be related with the error message you observe

Disregard everything above. For some reason I did not see error message in the console so my initial analysis was completely wrong

from htmx-signalr.

Basically, the following happens

1. Message is received
2. Target is extracted from hx-target
3. Swapping begins
4. OOB swapping replaces the target
5. The old target is unmounted from the DOM but the reference to it is still alive within the swapping method
6. The normal swapping begins
7. The element is unmounted so it has no siblings and no parent
8. Error is raised

Workaround with innerHTML is working because there is no attempt to access parent or sibling of the target, and there is a lot of guards for empty values, so when it's unmounted from the DOM, no errors happen.

I'll have to do more triagin, for I suspect that this may affect any cases when OOB swap replaces original target. Maybe the issue would have to be moved back to htmx repo

As a general tip, I would advise against using OOB swaps on existing targets. OOB is intended to be used for updates somewhere else on the page, whereas in your case you are handling the same target. Simply returning [1] without hx-swap-oob from the hub works as expected

[1]

<div id="component" signalr-subscribe="echo" hx-target="this">Some new content here<div/>

from htmx-signalr.