fix(react): make __internal_* URL props take precedence over bundled constructors

[jacekradko]

Summary

• __internal_clerkJSUrl now takes precedence over the bundled Clerk constructor prop in IsomorphicClerk.getClerkJsEntryChunk
• __internal_clerkUIUrl now takes precedence over the bundled ui.ClerkUI constructor prop in IsomorphicClerk.getClerkUIEntryChunk
• Previously, bundled constructors silently won, causing internal URL overrides (used for staging/canary testing) to be ignored

Test plan

• Added 4 new tests covering precedence behavior in both directions
• All 378 existing tests pass
• pnpm build passes for @clerk/react

Summary by CodeRabbit

• Tests

  • Expanded test coverage for internal URL configuration precedence and fallback behavior.

• Bug Fixes

  • Fixed loading precedence so externally specified script/UI URLs take priority over bundled constructors, preventing unintended overrides and skipping bundled prefetch/loading when external URLs are present.

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Feb 24, 2026 7:16pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 3dd794a

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

This PR includes changesets to release 6 packages

Name	Type
@clerk/react	Patch
@clerk/chrome-extension	Patch
@clerk/expo	Patch
@clerk/nextjs	Patch
@clerk/react-router	Patch
@clerk/tanstack-react-start	Patch

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• .changeset/internal-url-precedence.md

---

📝 Walkthrough

Walkthrough

The changes make internal URL flags take precedence for resource loading: when `__internal_clerkJSUrl` or `__internal_clerkUIUrl` are set, the implementation loads Clerk JS/UI from those URLs and avoids using or assigning bundled constructors. Tests were expanded and setup/teardown adjusted to verify URL precedence and fallback to bundled resources when the internal flags are absent.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: making internal URL props take precedence over bundled constructors in the Clerk React package.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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commit: 3dd794a