fix(utils): prevent race condition in parallel plugin runs

[beaussan]

Summary

Fixes a race condition when running the same plugin for multiple projects in parallel (e.g., via Nx targets).

Problem

When two processes started within the same millisecond, the timestamp-based directory naming in createRunnerFiles would collide:

node_modules/.code-pushup/{pluginSlug}/{timestamp}/

This caused one process to delete the output directory (in executeRunnerConfig) while another was still using it, leading to failures.

Solution

Added process.pid and a random suffix to the directory name to ensure uniqueness:

const uniqueId = `${Date.now()}-${process.pid}-${Math.random().toString(36).slice(2, 8)}`;

This ensures that even when multiple processes run simultaneously, each gets its own unique working directory.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 49d8341

Command	Status	Duration	Result
nx run ci:code-pushup -- merge-diffs --files=/h...	✅ Succeeded	6s	View ↗
nx run-many --targets=code-pushup --parallel=fa...	✅ Succeeded	1m 21s	View ↗
nx run-many -t unit-test,int-test	✅ Succeeded	<1s	View ↗
nx run-many --targets=code-pushup --parallel=fa...	✅ Succeeded	1m 22s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-01-20 12:27:36 UTC

[pkg-pr-new]

Open in StackBlitz

@code-pushup/ci

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/ci@1222

@code-pushup/cli

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/cli@1222

@code-pushup/core

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/core@1222

@code-pushup/create-cli

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/create-cli@1222

@code-pushup/models

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/models@1222

@code-pushup/nx-plugin

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/nx-plugin@1222

@code-pushup/axe-plugin

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/axe-plugin@1222

@code-pushup/eslint-plugin

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/eslint-plugin@1222

@code-pushup/coverage-plugin

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/coverage-plugin@1222

@code-pushup/js-packages-plugin

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/js-packages-plugin@1222

@code-pushup/jsdocs-plugin

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/jsdocs-plugin@1222

@code-pushup/lighthouse-plugin

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/lighthouse-plugin@1222

@code-pushup/typescript-plugin

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/typescript-plugin@1222

@code-pushup/utils

npm i https://pkg.pr.new/code-pushup/cli/@code-pushup/utils@1222

commit: 49d8341

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared current commit 1d7ffda with previous commit 1d7ffda.

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🔴 40	🔴 32
Bug prevention	🟡 75	🟡 75	–
Code style	🟢 100	🟢 100	–
Code coverage	🟢 92	🟢 92	–
Security	🟡 51	🟡 51	–
Updates	🟡 78	🟡 78	–
Type Safety	🟡 67	🟡 67	–
Miscellaneous	🟡 67	🟡 67	–
Documentation	🔴 42	🔴 42	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟢 92	🟢 92	–
Axe Accessibility	🟡 88	🟡 88	–

👎 1 group regressed, 👍 1 audit improved, 👎 4 audits regressed, 13 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🔴 40	🔴 32

33 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Initial server response time was short	🟥 Root document took 630 ms	🟩 Root document took 580 ms
Lighthouse	Speed Index	🟥 6.0 s	🟥 7.5 s
Lighthouse	Total Blocking Time	🟥 1,280 ms	🟥 3,120 ms
Lighthouse	Time to Interactive	🟥 12.1 s	🟥 14.7 s
Lighthouse	First Contentful Paint	🟥 3.1 s	🟥 3.3 s
Lighthouse	Avoids enormous network payloads	🟩 Total size was 2,112 KiB	🟩 Total size was 2,100 KiB
Lighthouse	Minimizes main-thread work	🟥 7.0 s	🟥 13.1 s
Lighthouse	JavaScript execution time	🟥 3.2 s	🟥 6.2 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Largest Contentful Paint	🟥 10.4 s	🟥 12.2 s
Lighthouse	Max Potential First Input Delay	🟥 830 ms	🟥 1,690 ms
Lighthouse	Server Backend Latencies	🟩 1,000 ms	🟩 520 ms
Lighthouse	Reduce unused CSS	🟥 Potential savings of 95 KiB	🟥 Potential savings of 95 KiB
Lighthouse	Remove duplicate modules in JavaScript bundles	🟥 Potential savings of 82 KiB	🟥 Potential savings of 88 KiB
Lighthouse	Reduce unused JavaScript	🟥 Potential savings of 226 KiB	🟥 Potential savings of 226 KiB
Lighthouse	Uses efficient cache policy on static assets	🟨 31 resources found	🟨 31 resources found
Lighthouse	Network Round Trip Times	🟩 70 ms	🟩 60 ms
Lighthouse	Cumulative Layout Shift	🟩 0.003	🟩 0

661 other audits are unchanged.

[github-actions]

Code PushUp

😐 Code PushUp report is unchanged – compared current commit 1d7ffda with previous commit 1d7ffda.

---

All of 14 projects are unchanged.

[BioPhoton]

added a suggestion