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Description
Link to the code that reproduces this issue
https://github.com/luishdz1010/next-bug-turbo-parallel-routes
To Reproduce
- Clone this reproduction repo:
npx degit luishdz1010/next-bug-turbo-parallel-routes next-bug-turbo-parallel-routescd next-bug-turbo-parallel-routespnpm installRun
pnpm build.Observe the failure while collecting page data for
/[tenant]/cwith the referenced stack trace.
Current vs. Expected behavior
next build fails under Turbopack when a layout forapp/[tenant]/[[...pages]] exportsgenerateStaticParams while the same route tree also defines a parallel route slot (@nav/c). During static path generation Turbopack attempts to destructure the param descriptor forpages from the regex associated with/[tenant]/c, but that route does not declare the optional catch-all param, leading to:
TypeError: Cannot destructure property 'repeat' of 'regex.groups[paramName]' as it is undefined. at ignore-listed frames> Build error occurredError: Failed to collect page data for /[tenant]/cWorks fine with--webpack, also works fine with Turbo's dev mode.
Expected
next build should succeed with Turbopack. Routes that do not define apages param should not receive static params generated for sibling branches.
Provide environment information
Operating System: Platform: linux Arch: x64 Version:#202508231538~1757385336~22.04~8f363f2 SMP PREEMPT_DYNAMIC Tue S Available memory (MB): 94177 Available CPU cores: 32Binaries: Node: 24.9.0 npm: 11.6.0 Yarn: N/A pnpm: 9.15.4Relevant Packages: next: 15.6.0-canary.42 // Latest available version is detected (15.6.0-canary.42). eslint-config-next: N/A react: 19.2.0 react-dom: 19.2.0 typescript: 5.9.3Next.js Config: output: N/AWhich area(s) are affected? (Select all that apply)
Turbopack, Parallel & Intercepting Routes
Which stage(s) are affected? (Select all that apply)
next build (local)
Additional context
Using this patch as a workaround:
diff --git a/dist/build/static-paths/app.js b/dist/build/static-paths/app.jsindex 1a6b37fa742cc8c47c4b9ae0021d34537bf6c569..de26ca61af03caf08ab5754cda93b8186fc59e62 100644--- a/dist/build/static-paths/app.js+++ b/dist/build/static-paths/app.js@@ -567,6 +567,9 @@ async function buildAppStaticPaths({ dir, page, distDir, cacheComponents, authIn } else { // Collect all the route param keys that are not parallel route params. // These are the ones that will be included in the request pathname.+ if (!(regex.groups && regex.groups[segment.paramName])) {+ continue;+ } childrenRouteParamSegments.push({ name: segment.name, paramName: segment.paramName,@@ -637,7 +640,9 @@ async function buildAppStaticPaths({ dir, page, distDir, cacheComponents, authIn // Precompile the regex patterns for the route params. const paramPatterns = new Map(); for (const { paramName } of childrenRouteParamSegments){- const { repeat, optional } = regex.groups[paramName];+ const group = regex.groups[paramName];+ if (!group) continue;+ const { repeat, optional } = group; let pattern = `[${repeat ? '...' : ''}${paramName}]`; if (optional) { pattern = `[${pattern}]`;