Support default exported classes that extend other classes

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

• resolves Rollup stalling #4783

Description

The logic that automatically adds ids when default exporting anonymous classes was not prepared to handle extends properly, which lead to an instance where Rollup stalled due to an infinite loop.

[vercel]

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Name	Status	Preview	Updated (UTC)
rollup	✅ Ready (Inspect)	Visit Preview	Apr 20, 2023 11:46am

[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#gh-4783-default-export-extends

or load it into the REPL:
https://rollup-a0ji70zed-rollup-js.vercel.app/repl/?pr=4950

[codecov]

Codecov Report

Merging #4950 (15b0c10) into master (e5691a0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4950   +/-   ##
=======================================
  Coverage   98.98%   98.98%           
=======================================
  Files         222      222           
  Lines        8047     8049    +2     
  Branches     2208     2210    +2     
=======================================
+ Hits         7965     7967    +2     
  Misses         28       28           
  Partials       54       54           

Impacted Files	Coverage Δ
src/ast/nodes/ExportDefaultDeclaration.ts	100.00% <100.00%> (ø)

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[rollup-bot]

This PR has been released as part of rollup@3.20.7. You can test it via npm install rollup.