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fix(nextjs): stop renaming the shared ClerkProvider at module load - #10773
Since 7.9.24, packages/nextjs/src/pages/ClerkProvider.tsx runs ReactClerkProvider.displayName = 'ReactClerkProvider' at module top level. ReactClerkProvider is InternalClerkProvider from @clerk/react/internal, the same component the App Router ClerkProvider renders, and @clerk/react names it 'ClerkProvider'.
The Pages module is loaded through #components (components.client.js) whenever a client component imports Show or ClerkProvider from @clerk/nextjs. After that happens on the server, the shared component's name has changed: the build-time prerender recorded <ClerkProvider>, the warm server resumes with <ReactClerkProvider>, and React's resume check fails on every request after the first:
Error: Expected the resume to render <ClerkProvider> in this slot but instead it rendered <ReactClerkProvider>. The tree doesn't match so React will fallback to client rendering.
The browser shows minified React error #419 and the page falls back to client rendering.
This PR removes the line. displayName only affects React DevTools and error messages, so nothing else changes. A regression test checks that importing the Pages provider leaves the shared component's displayName unchanged.
pnpm --filter @clerk/nextjs test -- src/pages/__tests__/displayName.test.ts. It fails with the removed line restored and passes without it.
End to end: in the reproduction above, point @clerk/nextjs at this build, run npm run build && npm start, and request the page twice. The resume error no longer appears.
I couldn't run the build locally. On Windows, @clerk/shared fails to build (rolldown-plugin-dts: "Export 'waitForElement' is not defined" in dom/index.d.mts). That happens without this change too, and CI builds the package fine on Linux, so I'm relying on CI for test and build.
Checklist
pnpm test runs as expected.
pnpm build runs as expected.
(If applicable) JSDoc comments have been added or updated for any package exports
No actionable comments were generated in the recent review.
Walkthrough
The Pages Router provider module no longer assigns ReactClerkProvider as the shared provider's display name. A regression test checks that importing the module leaves InternalClerkProvider.displayName as ClerkProvider. A changeset declares a patch release for @clerk/nextjs.
No actionable merge-blocking risk remains from the reviewed change.
Pre-merge checks: 4
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Explanation
Title check
The title names the main change: the Pages Router ClerkProvider module no longer renames the shared ClerkProvider component at module load. It states the fix and the affected area in one sentence, and…
Description check
The description explains the bug, the cause (a module-level assignment to ReactClerkProvider.displayName), the resulting resume error, the fix (removing the line), and how to test it. It relates direc…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Title check
Explanation
The title names the main change: the Pages Router ClerkProvider module no longer renames the shared ClerkProvider component at module load. It states the fix and the affected area in one sentence, and it matches the diff, which removes the displayName assignment.
Full details: Description check
Explanation
The description explains the bug, the cause (a module-level assignment to ReactClerkProvider.displayName), the resulting resume error, the fix (removing the line), and how to test it. It relates directly to the changeset.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @packages/nextjs/src/pages/__tests__/displayName.test.ts:
- Line 8: Update the dynamic import in the display-name test to use the `.js`
extension for `ClerkProvider`, satisfying the test configuration’s NodeNext
typechecking requirement.
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Regressed in #10526: the React Compiler purity rule flagged mutating ReactClerkProvider.displayName during render, and it was moved to module scope, which made it run on import in App Router apps too. Removing it satisfies the rule without the global mutation.
`pages/ClerkProvider` set `InternalClerkProvider.displayName = 'ReactClerkProvider'`
at module top level. That component is shared with the App Router provider, so
once `components.client.js` is loaded on the server (by importing `Show` or
`ClerkProvider` from `@clerk/nextjs` in a client component), its name changes
between the build-time PPR prerender and the runtime resume. React then aborts
the resume with "Expected the resume to render <ClerkProvider> in this slot but
instead it rendered <ReactClerkProvider>" and falls back to client rendering.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Description
Since 7.9.24,
packages/nextjs/src/pages/ClerkProvider.tsxrunsReactClerkProvider.displayName = 'ReactClerkProvider'at module top level.ReactClerkProviderisInternalClerkProviderfrom@clerk/react/internal, the same component the App RouterClerkProviderrenders, and@clerk/reactnames it'ClerkProvider'.The Pages module is loaded through
#components(components.client.js) whenever a client component importsShoworClerkProviderfrom@clerk/nextjs. After that happens on the server, the shared component's name has changed: the build-time prerender recorded<ClerkProvider>, the warm server resumes with<ReactClerkProvider>, and React's resume check fails on every request after the first:The browser shows minified React error #419 and the page falls back to client rendering.
This PR removes the line.
displayNameonly affects React DevTools and error messages, so nothing else changes. A regression test checks that importing the Pages provider leaves the shared component'sdisplayNameunchanged.Minimal reproduction: https://github.com/marcvive/clerk-ppr-resume-repro (Next 16.4.5 with
cacheComponents; works on 7.9.23, fails on 7.9.24 and 7.9.25).How to test
pnpm --filter @clerk/nextjs test -- src/pages/__tests__/displayName.test.ts. It fails with the removed line restored and passes without it.@clerk/nextjsat this build, runnpm run build && npm start, and request the page twice. The resume error no longer appears.I couldn't run the build locally. On Windows,
@clerk/sharedfails to build (rolldown-plugin-dts: "Export 'waitForElement' is not defined" indom/index.d.mts). That happens without this change too, and CI builds the package fine on Linux, so I'm relying on CI for test and build.Checklist
pnpm testruns as expected.pnpm buildruns as expected.Type of change
🤖 Generated with Claude Code