intersection_observer library Null safety

Intersection Observer

https://w3c.github.io/IntersectionObserver/

Classes

IntersectionObserver
IntersectionObserverEntry
IntersectionObserverEntryInit
IntersectionObserverInit

Extensions

PropsIntersectionObserver
PropsIntersectionObserverEntry
PropsIntersectionObserverEntryInit
PropsIntersectionObserverInit