chore: Remove jest-process-manager dependency by implementing server …

[ysknsid25]

What I did

jest-process-manager is now a public archive and can no longer be updated. Its transitive dependency axios contains a known vulnerability (CVE-2026-40175). Specifically, jest-process-manager depends on wait-on@^7.0.0, which in turn depends on a vulnerable version of axios. Since jest-process-manager is archived, there is no way to get a fix, meaning the vulnerability will remain indefinitely. Depending on a publicly archived package is also generally inappropriate.

As an alternative, jest-dev-server — the package that jest-process-manager was originally forked from — is also archived and cannot be used as a replacement.

This PR removes the dependency entirely by reimplementing the setup / teardown functionality inline using Node.js built-in child_process and the existing wait-on devDependency. The API signature remains fully compatible with the previous behavior.

Checklist for Contributors

Manual Testing Steps

A minimal reproduction environment is available in the test/ directory of the test/server-options-repro branch.

Setup

# 1. Clone the branch
git clone -b test/server-options-repro https://github.com/ysknsid25/test-runner.git
cd test-runner

# 2. Build the test-runner
yarn install && yarn build

# 3. Install dependencies for the test project
cd test
npm install

# 4. Build Storybook static files
npm run build-storybook

Run

npm run test-storybook:ci

What to verify

• serverOptions starts src/mock-server.js (port 3001) automatically before tests run
  • Console output shows Mock server running on port 3001
• Button/Primary and Button/Secondary stories pass
• src/mock-server.js process is terminated after tests complete
  • lsof -ti :3001 returns nothing after the run
• Jest exits cleanly (no "Jest did not exit one second after the test run" warning)

Expected output

[1]  PASS   browser: chromium  src/Button.stories.jsx
[1]   Example/Button
[1]     Primary
[1]       ✓ smoke-test
[1]     Secondary
[1]       ✓ smoke-test
[1]
[1] Test Suites: 1 passed, 1 total
[1] Tests:       2 passed, 2 total

Documentation

• Add or update documentation reflecting your changes in this repository
• Request documentation updates in the test-runner docs website

Checklist for Maintainers

• Make sure this PR contains one of the labels below:

  Available labels

  • skip-release: Skip any releases, e.g., documentation only changes, CI config etc.
  • patch: Upgrade patch version (e.g. 0.0.x)
  • minor: Upgrade patch version (e.g. 0.x.0)
  • major: Upgrade patch version (e.g. x.0.0)