chore: Add document is null check in invariant

[zombieJ]

Summary

In jest, when a test is ended, it will make document as null instead of undefined. So the invariant of typeof document !== 'undefined' will miss the case of null.

Test Plan

Update ReactDOM-test.js for null case.

[sizebot]

Comparing: 2e8bbcb...42adb80

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js	=	122.55 kB	122.56 kB	=	39.48 kB	39.48 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	129.13 kB	129.14 kB	=	41.53 kB	41.53 kB
facebook-www/ReactDOM-prod.classic.js	=	406.12 kB	406.14 kB	=	75.38 kB	75.39 kB
facebook-www/ReactDOM-prod.modern.js	=	394.47 kB	394.49 kB	=	73.49 kB	73.49 kB
facebook-www/ReactDOMForked-prod.classic.js	=	406.13 kB	406.15 kB	=	75.38 kB	75.39 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 42adb80

[zombieJ]

hi @acdlite, could you pls take a look? thanks~

[zombieJ]

cc @bvaughn

[zombieJ]

cc @gaearon

[zombieJ]

cc @rickhanlonii

[zombieJ]

cc @sebmarkbage

[zombieJ]

@acdlite @bvaughn @gaearon @rickhanlonii @sebmarkbage

[bvaughn]

@zombieJ Don't spam mentions. There are a lot of PRs waiting for review. The team will review them when we get the opportunity.

[zombieJ]

@zombieJ Don't spam mentions. There are a lot of PRs waiting for review. The team will review them when we get the opportunity.

Thanks for reply.

[zombieJ]

Hi @bvaughn,
This PR has passed month no processed. Seems recently days many PR have been merged. What should I do next?

[rickhanlonii]

Hey @zombieJ, thanks for the suggestion and I'm super sorry for the delay.

The real issue here is that this code is firing after jest has torn down the environment at all. To fix the core issue, we've created #20915, but that's a breaking change so we've been waiting until we're ready for the next release to land it.