chore(repo): allow PORT and UI_PORT overrides for sandbox dev servers

[iagodahlem]

Summary

Sandbox dev servers couldn't honor PORT or UI_PORT env overrides because of two coupled gaps:

• Turbo 2.x strict env mode silently strips env vars not declared in globalEnv / globalPassThroughEnv, so PORT and UI_PORT never reached the package scripts.
• @clerk/ui's dev:sandbox:serve and the clerk-js sandbox template's uiScriptUrl were hardcoded to localhost:4011.

After this PR:

PORT=4001 UI_PORT=4012 pnpm dev:sandbox

starts clerk-js on 4001 and @clerk/ui on 4012, and the sandbox template loads ui.browser.js from the matching UI_PORT.

PORT and UI_PORT default to their original values when unset, so existing workflows are unchanged.

Test plan

• pnpm dev:sandbox (no env vars) starts on 4000/4011 as before
• PORT=4001 UI_PORT=4012 pnpm dev:sandbox starts on 4001/4012, sandbox HTML loads ui.browser.js from 4012
• CI green

[changeset-bot]

🦋 Changeset detected

Latest commit: 0e53798

The changes in this PR will be included in the next version bump.

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	May 27, 2026 7:24pm

[github-actions]

Snapi: no API changes detected in @clerk/backend, @clerk/clerk-js, @clerk/nextjs, @clerk/react, @clerk/shared, @clerk/ui.

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commit: 0e53798

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📥 Commits

Reviewing files that changed from the base of the PR and between 0796911 and 0e53798.

📒 Files selected for processing (4)

• .changeset/sandbox-port-env-vars.md
• packages/clerk-js/rspack.config.js
• packages/ui/package.json
• turbo.json

---

📝 Walkthrough

Walkthrough

This PR introduces environment variable configurability for the UI port in the sandbox development setup. The turbo.json configuration is updated to pass through PORT and UI_PORT environment variables globally across monorepo tasks. The rspack.config.js build configuration then uses process.env.UI_PORT (defaulting to 4011) instead of a hardcoded port when constructing the UI script URL for the sandbox. Similarly, the dev:sandbox:serve script in packages/ui/package.json is updated to use the configurable UI_PORT environment variable. A changeset file documents this change.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: allowing PORT and UI_PORT environment variable overrides for sandbox dev servers, which is exactly what the changeset accomplishes across turbo.json, rspack.config.js, and package.json.
Description check	✅ Passed	The description is well-related to the changeset, clearly explaining the problem (Turbo 2.x strict env mode and hardcoded port values), the solution implemented (adding env vars to globalPassThroughEnv and parameterizing ports), and practical examples of the new functionality.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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