[CLI] Exit non-zero with a clear message when next typegen fails#94241
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| '\n> Failed to generate route types. The global `PageProps` and ' + | ||
| '`LayoutProps` helpers and other generated route types were not ' + | ||
| "written, which can surface as `Cannot find name 'PageProps'` " + | ||
| 'errors during type checking. This is often caused by ' + | ||
| '`next.config` failing to load. Original error:\n' |
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this seems a little wordy, do we really need to say that the types were not written? (actually they may have been written if the failure was late enough)
A simple: Unexpected error while generating route types, Original error:\n is probably enough.
lukesandberg
approved these changes
May 29, 2026
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The
typegencommand chainednextTypegen(...).then(() => process.exit(0))with no rejection handler. Whennext.configthrows duringloadConfig, the rejection is orphaned by the synchronousprogram.parseand then absorbed by Next'sunhandledRejectionfilter, so the process exits0having written no route types. A latertscthen reportsCannot find name 'PageProps'/'LayoutProps'(and missing*.pngmodules) with nothing tying it back to typegen. Add a.catchthat prints an actionable message about the missing route types andprocess.exit(1), sonext typegen && tschalts on failure. Includes an e2e test whose fixture config throws and asserts a non-zero exit with the diagnostic.