chore: drop structuredClone polyfill for v9

[bakkot]

I noticed this comment about a thing which could be removed and wanted to make sure it didn't get lost. Happy to close this if you don't want to worry about it.

This doesn't pass linting because no-undef claims that structuredClone is not defined, but I couldn't for the life of me figure out why. The globals package has listed structuredClone in node since 13.12.0. Fixed by upgrade to eslint-plugin-n, see below.

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[x] Other, please explain:

Removes a dependency which is no longer necessary in v9.

What changes did you make? (Give an overview)

Removed a polyfill.

Is there anything you'd like reviewers to focus on?

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[mdjermanovic]

This doesn't pass linting because no-undef claims that structuredClone is not defined, but I couldn't for the life of me figure out why. The globals package has listed structuredClone in node since 13.12.0.

@aladdin-add this seems to be related to eslint-plugin-n?

[aladdin-add]

@aladdin-add this seems to be related to eslint-plugin-n?

Yes, will take a look later!

also, I'm changing the pr title "feat!" => "chore", as it's a not a user-facing change.

[mdjermanovic]

In the meantime, I think we can enable the global variable manually in this PR to make the linting pass.

eslint/eslint.config.js

Lines 100 to 102 in 8792464

	languageOptions: {
	ecmaVersion: "latest"
	},

languageOptions: {
-    ecmaVersion: "latest",
+    ecmaVersion: "latest",
+    globals: {
+       structuredClone: "readonly"
+    }
},

[mdjermanovic]

Okay, this works now with the new version of eslint-plugin-n, there's no need to update our eslint.config.js.

[mdjermanovic]

LGTM, thanks! Would like @nzakas to verify before merging.

[nzakas]

LGTM. Thanks!