fix(plugin-lighthouse): prevent cleanup permissions error on windows

[matejchalk]

Fixes #1122

The permissions error seems to be a cleanup bug in lighthouse/chrome-launcher (see GoogleChrome/chrome-launcher#355). Overriding the default system temporary directory path on Windows to a local path fixes the tests.

From Node.js os.tmpdir() docs:

On Windows, the result can be overridden by TEMP and TMP environment variables, and TEMP takes precedence over TMP. If neither is set, it defaults to %SystemRoot%\temp or %windir%\temp.

On non-Windows platforms, TMPDIR, TMP and TEMP environment variables will be checked to override the result of this method, in the described order. If none of them is set, it defaults to /tmp.

Some operating system distributions would either configure TMPDIR (non-Windows) or TEMP and TMP (Windows) by default without additional configurations by the system administrators. The result of os.tmpdir() typically reflects the system preference unless it's explicitly overridden by the users.

I suspect GitHub's recent windows-latest image migration might be the reason the jobs started failing for us recently.

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☁️ Nx Cloud last updated this comment at 2025-09-26 12:45:00 UTC

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared current commit ee07af5 with previous commit b7ce5c6.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🔴 38	🔴 38
Documentation	🔴 24	🔴 24
Code coverage	🟡 90	🟡 90
Security	🟡 56	🟡 56	–
Updates	🟡 84	🟡 84	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Type Safety	🟢 100	🟢 100	–
Bug prevention	🟢 100	🟢 100	–
Miscellaneous	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–

👍 3 groups improved, 👍 4 audits improved, 👎 2 audits regressed, 15 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🔴 38	🔴 38
JSDoc coverage	Documentation coverage	🔴 24	🔴 24
Code coverage	Code coverage metrics	🟡 90	🟡 90

18 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	First Contentful Paint	🟨 2.9 s	🟥 3.1 s
Lighthouse	Total Blocking Time	🟥 1,590 ms	🟥 1,450 ms
Lighthouse	Speed Index	🟥 6.2 s	🟥 6.2 s
JSDoc coverage	Functions coverage	🟥 521 undocumented functions	🟥 521 undocumented functions
Code coverage	Line coverage	🟨 86.3 %	🟨 86.3 %
Code coverage	Branch coverage	🟨 85.5 %	🟨 85.5 %
Lighthouse	Avoids enormous network payloads	🟩 Total size was 2,032 KiB	🟩 Total size was 2,020 KiB
Lighthouse	Server Backend Latencies	🟩 1,500 ms	🟩 300 ms
Lighthouse	Largest Contentful Paint	🟥 11.2 s	🟥 10.6 s
Lighthouse	Uses efficient cache policy on static assets	🟨 30 resources found	🟨 30 resources found
Lighthouse	Reduce unused CSS	🟥 Potential savings of 102 KiB	🟥 Potential savings of 102 KiB
Lighthouse	Reduce unused JavaScript	🟥 Potential savings of 156 KiB	🟥 Potential savings of 179 KiB
Lighthouse	Remove duplicate modules in JavaScript bundles	🟥 Potential savings of 101 KiB	🟥 Potential savings of 101 KiB
Lighthouse	Time to Interactive	🟥 12.9 s	🟥 12.8 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Minimizes main-thread work	🟥 11.2 s	🟥 11.1 s
Lighthouse	JavaScript execution time	🟥 4.6 s	🟥 4.6 s
Lighthouse	Max Potential First Input Delay	🟥 1,120 ms	🟥 1,150 ms
Lighthouse	Initial server response time was short	🟩 Root document took 440 ms	🟩 Root document took 410 ms
Lighthouse	Network Round Trip Times	🟩 10 ms	🟩 30 ms
Code coverage	Function coverage	🟩 92.5 %	🟩 92.5 %

589 other audits are unchanged.

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commit: ebabf97