Support for Intersection Observer?

[ApoorvSaxena]

Is it possible to make use of polyfills to add support of IntersectionObserver or any missing JS feature in JSDOM?

IntersectionObserver polyfill

[Zirro]

...or any missing JS feature in JSDOM?

You can polyfill many missing features, but IntersectionObserver would be of little use since jsdom doesn't do any layouting. We would need at least parts of #1322 implemented first.

[sanderd17]

As far as I know, JSDOM is mainly used for tests. So it doesn't need a layout engine IMO, but it would need a way to mock elements coming into view and back out again.

[thedamon]

Whether or not they function completely, I think a simple way to globally mock supported browser APIs makes everyone's legitimate web targeted code less likely to throw exceptions once it runs in jsdom. Wouldn't that be ideal?

[chad-fossa]

+1 to having this be a proxy object or something. Letting jsdom sort of just ignore this (and other valid layout engine objects) would let tests "just render" these components. For example, I'm trying to render something with React Testing Library that uses this object and I'm getting "IntersectionObserver is not defined"