chore: add eslint formatter for multiple formats

[BioPhoton]

This PR includes:

• added MVP custom lint formatter under tools
• add lint-formatter to nx.json#defaultTargets

Related:

• Use artifact generation options in plugin-eslint #1068

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 53c5796

Command	Status	Duration	Result
nx code-pushup --nx-bail -- compare --verbose	✅ Succeeded	23s	View ↗
nx code-pushup --nx-bail -- --verbose	✅ Succeeded	38s	View ↗
nx code-pushup --nx-bail -- print-config --verb...	✅ Succeeded	13m 32s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-08-29 17:21:39 UTC

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commit: 1592f62

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared current commit 4d20a62 with previous commit a6d3965.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🔴 40	🔴 38
Code style	🟢 100	🟢 99
Code coverage	🟢 90	🟡 90
Bug prevention	🟢 100	🟢 99
Updates	🟡 85	🟡 85
Documentation	🔴 23	🔴 23
Security	🟡 64	🟡 64	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Type Safety	🟢 100	🟢 100	–
Miscellaneous	🟢 100	🟢 100	–

👍 2 groups improved, 👎 5 groups regressed, 👍 3 audits improved, 👎 11 audits regressed, 13 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
ESLint	Module systems (import)	🟢 100	🟡 50
Lighthouse	Performance	🔴 40	🔴 38
ESLint	Suggestions	🟢 100	🟢 99
ESLint	Problems	🟢 100	🟢 99
Code coverage	Code coverage metrics	🟢 90	🟡 90
JS Packages	NPM outdated dependencies	🟡 85	🟡 85
JSDoc coverage	Documentation coverage	🔴 23	🔴 23

14 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
ESLint	Ensure that module boundaries are respected within the monorepo	🟩 passed	🟥 2 errors
ESLint	Disallow invocation of require()	🟩 passed	🟥 1 error
ESLint	Prefer JavaScript modules (ESM) over CommonJS.	🟩 passed	🟥 1 warning
ESLint	Forbid CommonJS require calls and module.exports or exports.*.	🟩 passed	🟥 1 error
Lighthouse	Speed Index	🟥 7.2 s	🟥 8.4 s
Lighthouse	First Contentful Paint	🟥 3.2 s	🟥 3.5 s
Lighthouse	Largest Contentful Paint	🟥 4.8 s	🟥 4.9 s
Code coverage	Line coverage	🟨 87.5 %	🟨 86.1 %
Lighthouse	Time to Interactive	🟥 17.8 s	🟥 18.3 s
JS Packages	Outdated NPM dev dependencies.	🟨 50 outdated package versions (21 major, 23 minor, 6 patch)	🟨 50 outdated package versions (21 major, 23 minor, 6 patch)
Code coverage	Function coverage	🟩 93 %	🟩 92.5 %
Code coverage	Branch coverage	🟨 86.3 %	🟨 86 %
JSDoc coverage	Functions coverage	🟥 519 undocumented functions	🟥 517 undocumented functions
JSDoc coverage	Variables coverage	🟥 230 undocumented variables	🟥 229 undocumented variables
Lighthouse	Avoids enormous network payloads	🟨 Total size was 2,678 KiB	🟨 Total size was 2,682 KiB
Lighthouse	Minimizes main-thread work	🟥 16.6 s	🟥 20.2 s
Lighthouse	JavaScript execution time	🟥 6.2 s	🟥 7.9 s
Lighthouse	Total Blocking Time	🟥 5,270 ms	🟥 6,970 ms
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Uses efficient cache policy on static assets	🟨 32 resources found	🟨 32 resources found
Lighthouse	Reduce unused CSS	🟥 Potential savings of 113 KiB	🟥 Potential savings of 113 KiB
Lighthouse	Max Potential First Input Delay	🟥 1,700 ms	🟥 1,860 ms
Lighthouse	Initial server response time was short	🟩 Root document took 420 ms	🟩 Root document took 390 ms
Lighthouse	Server Backend Latencies	🟩 1,080 ms	🟩 1,100 ms
Lighthouse	Network Round Trip Times	🟩 50 ms	🟩 70 ms
Lighthouse	Avoids an excessive DOM size	🟥 2,287 elements	🟥 2,285 elements
JS Packages	Outdated NPM prod dependencies.	🟨 14 outdated package versions (3 major, 6 minor, 5 patch)	🟨 15 outdated package versions (3 major, 7 minor, 5 patch)

583 other audits are unchanged.

[matejchalk]

Can't we use tsc for building the formatter? It would be simpler to stick to the configuration from other projects.

[BioPhoton]

I used it to test a newer bundler to experiment a bit with dual build. Can ylso move it to another PR..

[matejchalk]

Shouldn't there be a dependsOn to ensure dist/eslint-multi-format exists and is up-to-date?

[BioPhoton]

Thats a bit of a dilemma ... in best case we can run lint independent of build.
For now ill fix it, for future we have to publish eslint fotmatter as separate package (already listed in issue)