test: add test for ESLint v9

[ota-meshi]

close #183

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.95%. Comparing base (0c21af5) to head (8b2da74).
Report is 3 commits behind head on main.

❗ Current head 8b2da74 differs from pull request most recent head a1fd76d. Consider uploading reports for the commit a1fd76d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #186   +/-   ##
=======================================
  Coverage   96.95%   96.95%           
=======================================
  Files          13       13           
  Lines        2102     2102           
  Branches      397      397           
=======================================
  Hits         2038     2038           
  Misses         63       63           
  Partials        1        1           

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[fisker]

@ota-meshi

eslint-utils/package.json

Line 68 in 0c21af5

"eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"

[fisker]

Any plan to release a new version?

[voxpelli]

This doesn't just add a test, it also fixes compatibility, right?

[ota-meshi]

I think it's already compatible with v9 (>=8.0.0).
If you use the pre-release, you only need to force install it. Or do you think we also have to do a pre-release?

[voxpelli]

Opened a separate PR for allowing ESLint 9 pre-releases, as that's what's needed for eg. @fisker to be unblocked with eslint-plugin-unicorn: #206

I will review this one separately as its about testing to ensure that we actually work as expected with it, which as you say @ota-meshi we should be 🙂