feat: Use globalThis if available

[eps1lon]

What:

Closes #1061

Why:

Test runners like vitest create environments where window does not reflect self. This is not an environment that exists outside of vitest. This was fixed in latest versions of vitest (see vitest-dev/vitest#1256).

But it's good to get in anyway to support older versions as well as other test environments that aren't configured properly but run in later versions of Node or browsers.

How:

Use globalThis if available.

Checklist:

• [ ] Documentation added to the
  docs site
• Tests
• [ ] TypeScript definitions updated
• Ready to be merged
  

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[codecov]

Codecov Report

Merging #1070 (4df5d4d) into main (f176285) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #1070   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          181       181           
  Branches        36        36           
=========================================
  Hits           181       181           

Flag	Coverage Δ
experimental	100.00% <100.00%> (ø)
latest	100.00% <100.00%> (ø)
next	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/act-compat.js	100.00% <100.00%> (ø)

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[nknapp]

I've been wondering if this should be covered by a test. This is always the hard part...

[eps1lon]

We didn't cover the other branches as well.

The specific bug can only be tested with older versions of vitest anyway.

[github-actions]

🎉 This PR is included in version 13.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[ph-fritsche]

I've been wondering if this should be covered by a test. This is always the hard part...

I've added a linting rule in user-event making sure that any global is accessed per globalThis.

(Because of issues with environments which shadow global variables in test. Resulting in constructors not being identical, thus errors in jsdom internals due to instanceof failing.)

See testing-library/user-event#931