Deoptimize custom event detail

[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 Incorrect treeshaking when passing detail to global CustomEvent #5122

Description

This deoptimizes the detail property of custom events as that can be mutated later.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
rollup	✅ Ready (Inspect)	Visit Preview	Sep 5, 2023 6:54pm

[github-actions]

Thank you for your contribution! ❤️

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

npm install rollup/rollup#gh-5122-custom-event-detail

or load it into the REPL:
https://rollup-1dby30tni-rollup-js.vercel.app/repl/?pr=5123

[codecov]

Codecov Report

Merging #5123 (b4483bf) into master (bb6bfa7) will increase coverage by 0.00%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5123   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files         226      226           
  Lines        8394     8395    +1     
  Branches     2303     2303           
=======================================
+ Hits         8307     8308    +1     
  Misses         31       31           
  Partials       56       56           

Files Changed	Coverage Δ
src/ast/nodes/shared/knownGlobals.ts	100.00% <100.00%> (ø)

[rollup-bot]

This PR has been released as part of rollup@3.29.0. You can test it via npm install rollup.