The project uses express@^4.18.3 at runtime but had @types/express@^5.0.6 as type definitions. The v5 types widened ParamsDictionary from string to string | string[], causing 115 type errors across all route handlers. Fix: downgrade @types/express to ^4.17.25 (latest v4), which correctly types req.params as string — matching Express 4 runtime behaviour. Removes the StringParams = Record<string, string> workaround from types.ts and the Request<StringParams> annotations from all 15 route files that were introduced as a workaround for the type mismatch.
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1.0 KiB