tools: enable eslint concurrency mode

[JLHwung]

In this PR we enable the ESLint --concurrency mode. Per report from TIME(1), a cache-missed eslint job has improved from 75 seconds to 25 seconds on my machine. In the cache-hit scenario, both mode exit in less than 2 seconds.

[anonrig]

We also bumped all eslint deps. Linter is still happy, no code changes are required.

Can you open a different pull-request for this?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.16%. Comparing base (f96dccc) to head (2ecbf9a).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #62352   +/-   ##
=======================================
  Coverage   90.15%   90.16%           
=======================================
  Files         751      751           
  Lines      253443   253443           
  Branches    47729    47731    +2     
=======================================
+ Hits       228496   228508   +12     
- Misses      16201    16208    +7     
+ Partials     8746     8727   -19     

see 37 files with indirect coverage changes

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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[JLHwung]

We also bumped all eslint deps. Linter is still happy, no code changes are required.

Can you open a different pull-request for this?

Sure, open #62356.

[anonrig]

Can you update this PR?

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71952/

[JLHwung]

It seems that CI errors are not related, could anyone restart the CI?

[github-actions]

This pull request has been marked as stale due to 90 days of inactivity.
It will be automatically closed in 30 days if no further activity occurs. If this is still relevant, please leave a comment or update it to keep it open.

[JLHwung]

Not stale. I don't have the Jenkins CI permission so don't what is going on, could anyone restart the CI?

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/76300/

[nodejs-github-bot]

Commit Queue failed

⚠ Could not retrieve the email or name of the PR author's from user's GitHub profile!

The pull request was removed from the Commit Queue and labeled commit-queue-failed An error occurred while landing this pull request using GitHub Actions. . After resolving the failure, remove that label and add commit-queue Add this label to land a pull request using GitHub Actions. to retry.

Full Commit Queue output

- Loading data for nodejs/node/pull/62352
✔  Done loading data for nodejs/node/pull/62352
----------------------------------- PR info ------------------------------------
Title      tools: enable eslint concurrency mode (#62352)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     JLHwung:improve-eslint-ci-perf -> nodejs:main
Labels     build, tools, author ready, needs-ci, commit-queue
Commits    1
 - tools: enable concurrency for eslint
Committers 1
 - Huáng Jùnliàng <jlhwung@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/62352
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/62352
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
--------------------------------------------------------------------------------
   ℹ  This PR was created on Fri, 20 Mar 2026 15:30:45 GMT
   ✔  Approvals: 4
   ✔  - Aviv Keller (@avivkeller): https://github.com/nodejs/node/pull/62352#pullrequestreview-3988128487
   ✔  - Yagiz Nizipli (@anonrig) (TSC): https://github.com/nodejs/node/pull/62352#pullrequestreview-3988257998
   ✔  - Luigi Pinca (@lpinca): https://github.com/nodejs/node/pull/62352#pullrequestreview-4009815856
   ✔  - Trivikram Kamat (@trivikr): https://github.com/nodejs/node/pull/62352#pullrequestreview-4010284063
   ✔  Last GitHub CI successful
   ℹ  Last Full PR CI on 2026-08-23T15:35:56Z: https://ci.nodejs.org/job/node-test-pull-request/76300/
- Querying data for job/node-test-pull-request/76300/
✔  Build data downloaded
   ✔  Last Jenkins CI successful
--------------------------------------------------------------------------------
   ✔  No git cherry-pick in progress
   ✔  No git am in progress
   ✔  No git rebase in progress
--------------------------------------------------------------------------------
- Bringing origin/main up to date...
From https://github.com/nodejs/node
 * branch                  main       -> FETCH_HEAD
✔  origin/main is now up-to-date
- Downloading patch for 62352
From https://github.com/nodejs/node
 * branch                  refs/pull/62352/merge -> FETCH_HEAD
✔  Fetched commits as 82e7ff4f8452..7831d51999ce
--------------------------------------------------------------------------------
Auto-merging Makefile
[main 00fec459bd] tools: enable concurrency for eslint
 Author: Huáng Jùnliàng <jlhwung@gmail.com>
 Date: Wed Mar 18 17:59:15 2026 -0400
 1 file changed, 3 insertions(+), 2 deletions(-)
   ✔  Patches applied
--------------------------------------------------------------------------------
--------------------------------- New Message ----------------------------------
tools: enable concurrency for eslint

PR-URL: https://github.com/nodejs/node/pull/62352
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
--------------------------------------------------------------------------------
[main f2176a2fec] tools: enable concurrency for eslint
 Author: Huáng Jùnliàng <jlhwung@gmail.com>
 Date: Wed Mar 18 17:59:15 2026 -0400
 1 file changed, 3 insertions(+), 2 deletions(-)
  ✖  f2176a2fecb36e79913dd64262061e9eb7a185ef
     ✔  0:0      no Assisted-by metadata                   assisted-by-is-trailer
     ✔  0:0      no Co-authored-by metadata                co-authored-by-is-trailer
     ✔  0:0      skipping fixes-url                        fixes-url
     ✔  0:0      blank line after title                    line-after-title
     ✔  0:0      line-lengths are valid                    line-length
     ✔  0:0      metadata is at end of message             metadata-end
     ✔  1:8      PR-URL is valid.                          pr-url
     ✔  0:0      reviewers are valid                       reviewers
     ✖  0:0      Commit must have a "Signed-off-by" trailer signed-off-by
     ✔  0:0      valid subsystems                          subsystem
     ✔  0:0      Title is formatted correctly.             title-format
     ✔  0:0      Title is <= 50 columns.                   title-length
--------------------------------------------------------------------------------
   ℹ  Please fix the commit message and try again.
Please manually ammend the commit message, by running
`git commit --amend`
Once commit message is fixed, finish the landing command running
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[trivikr]

@JLHwung Can you please sign your commit message and force push?

It's required as per instructions

Your commit must contain the Signed-off-by line with your name and email address as an acknowledgement that you agree to the Developer Certificate of Origin.

[JLHwung]

@JLHwung Can you please sign your commit message and force push?

It's required as per instructions

Your commit must contain the Signed-off-by line with your name and email address as an acknowledgement that you agree to the Developer Certificate of Origin.

Thank you. Rebased and signed off.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/76339/