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

core

Is this a regression?

No

Description

With SSR enabled on ng serve I get ERROR ReferenceError: IntersectionObserver is not defined

Please provide a link to a minimal reproduction of the bug

No response

Please provide the exception or error you saw

No response

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

No response

Anything else?

No response