Hydration does not create custom elements

[nolanlawson]

In a normal CSR (Client-Side Rendered) LWC scenario, we create custom elements (demo). So if you render <x-app> and then do:

customElements.get('x-app')

... this will return an actual LWC element constructor.

In SSR+hydration, however, we don't create custom elements (demo).

So customElements.get('x-app') returns undefined:

SSR+hydration should (ideally) result in the same thing as a pure CSR app. So hydration should result in custom elements being defined.

[git2gus[bot]]

This issue has been linked to a new work item: W-11634909

[nolanlawson]

Fixed by https://github.com/salesforce/lwc/pull/3802 although we need a follow-up PR for lifecycle events.