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Overview

This PR upgrades eslint from major version 8.x to 9.x. I'm very thankful for insights given by @Lightning00Blade in the original issue on try-catch issue with currently used Rollup bundler.

Contrary to other dev deps upgrade, eslint v9 is bit bloat-y but it helps out with tons of outdated transitive deps instead so it's a net positive IMO.

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@mark-wiemer mark-wiemer left a comment

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This looks pretty good, just a couple suggestions :)

@mark-wiemer mark-wiemer self-assigned this Dec 3, 2025
@mark-wiemer mark-wiemer added the status: waiting for author waiting on response from OP or other posters - more information needed label Dec 4, 2025
@hainenber hainenber force-pushed the chore/upgrade-eslint-8-to-9 branch from cb853ec to baf9cdf Compare December 4, 2025 16:06
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codecov bot commented Dec 4, 2025

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.52%. Comparing base (cafa782) to head (ee7fe65).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files
@@           Coverage Diff           @@
##             main    #5559   +/-   ##
=======================================
  Coverage   93.52%   93.52%           
=======================================
  Files          57       57           
  Lines        4465     4465           
  Branches      918      918           
=======================================
  Hits         4176     4176           
  Misses        289      289           

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@mark-wiemer mark-wiemer removed the status: waiting for author waiting on response from OP or other posters - more information needed label Dec 6, 2025
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@JoshuaKGoldberg JoshuaKGoldberg left a comment

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LGTM, thanks! 🚀

I was tripped up a bit by the removals of the inline disables. Most of the rules are actually ones I was expecting to be enabled. But they're not, and enabling them separately would be a followup issue (#5281 & friends).

@JoshuaKGoldberg JoshuaKGoldberg merged commit bb24ca8 into mochajs:main Dec 10, 2025
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@hainenber hainenber deleted the chore/upgrade-eslint-8-to-9 branch December 11, 2025 02:18
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🛠 Repo: Bump eslint from 8 to 9

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