fix(shared): improve single-session sign-in/sign-up dev warning wording

[alexcarpenter]

Summary

• The cannot_render_single_session_enabled dev warning previously used phrasing like "this is no-op" which made it look like something was broken
• Reworded to clearly state this is expected behavior when a user is already signed in under single-session mode, and points developers to the Dashboard to enable multi-session if that's what they want
• Before: The SignIn or SignUp modals do not render when a user is already signed in, unless the application allows multiple sessions. Since a user is signed in and this application only allows a single session, this is no-op.
• After: The <SignIn/> and <SignUp/> modals are hidden because a user is already signed in and this application is configured for single-session mode. This is expected behavior — no action is needed. To allow rendering while signed in, enable multi-session mode in your Clerk Dashboard.

Ref: SDK-66

Test plan

• Added warnings.test.ts verifying the warning contains key phrases ("expected behavior", "single-session mode", "multi-session mode", dev notice)
• Verify in dev mode that the warning renders with the updated wording when triggering openSignIn/openSignUp while signed in

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	May 6, 2026 2:56pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 68033c5

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

This PR includes changesets to release 20 packages

Name	Type
@clerk/shared	Patch
@clerk/astro	Patch
@clerk/backend	Patch
@clerk/chrome-extension	Patch
@clerk/clerk-js	Patch
@clerk/expo-passkeys	Patch
@clerk/expo	Patch
@clerk/express	Patch
@clerk/fastify	Patch
@clerk/hono	Patch
@clerk/localizations	Patch
@clerk/msw	Patch
@clerk/nextjs	Patch
@clerk/nuxt	Patch
@clerk/react-router	Patch
@clerk/react	Patch
@clerk/tanstack-react-start	Patch
@clerk/testing	Patch
@clerk/ui	Patch
@clerk/vue	Patch

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: 26d5eae7-757d-4891-8fd7-dd120d5b78da

📥 Commits

Reviewing files that changed from the base of the PR and between 8976922 and 68033c5.

📒 Files selected for processing (1)

• .changeset/single-session-warning-wording.md

✅ Files skipped from review due to trivial changes (1)

• .changeset/single-session-warning-wording.md

---

📝 Walkthrough

Walkthrough

This PR adds a Vitest test file that asserts the cannotOpenSignInOrSignUp warning includes the phrases "expected behavior", "single-session mode", "multi-session mode", and a development notice. It also updates the cannotOpenSignInOrSignUp warning string in warnings.ts to reference single-session mode behavior and direct developers toward enabling multi-session mode. A changeset patch file documenting the wording change was added.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: improving the wording of a developer warning for single-session mode sign-in/sign-up scenarios.
Description check	✅ Passed	The description is directly related to the changeset, providing clear before/after comparisons and explaining why the wording was changed.
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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Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 Microsoft Presidio Analyzer (2.2.362)

.changeset/single-session-warning-wording.md

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commit: 68033c5