Synthetic Industry

Troubleshooting guide · updated 2026-10-11

Next.js deployment blocked by a type error: fix the contract, not the check

Distinguish a genuine TypeScript mismatch from different build configurations and retain a production type check when repairing a failed deployment.

A release gate, not an arbitrary red badge

For an owner waiting to publish a change, record the first type diagnostic, affected file and source revision. A development page opening is not evidence that the production type check passed. The official reference says ignoreBuildErrors bypasses type checking altogether; it does not repair the reported contract.

  • Record the locked Next.js, TypeScript and package-manager versions.
  • Compare the build's selected tsconfigPath and its included files with the local production build.
  • Keep the diagnostic text but remove private paths and source excerpts from an initial enquiry.

Find what disagrees

Classify the error: a possibly missing value, incompatible component input, changed library interface or a different TypeScript configuration. Ask the maintainer to trace the actual value and its expected contract on an authorised copy. A blanket cast, non-null assertion or ignored error can merely hide a runtime failure.

  • Use the same revision, lockfile and documented production-build command on the isolated copy.
  • If configuration differs, explain why the two builds check different files before changing either.
  • If application behaviour is wrong, preserve an ordinary synthetic regression that demonstrates the intended behaviour.

Acceptance that keeps the gate meaningful

An authored acceptance case is a passing production type check with the original check enabled, the same commit building in the agreed preview and the affected route rendering its synthetic expected state. Also inspect the diff for new suppressions. These are proposed checks, not an executed repair.

  • Test a missing optional value as well as the usual populated value when that is the reported contract.
  • Record build configuration and exit result, not just a green deployment icon.

Non-fit and priced route

The current nextjs-vercel-build-fails offer is £149 only for its eligible local-production-pass/Vercel-fail deployment case. If both production builds fail, that fixed offer does not fit: describe one ordinary, reproducible application defect to fix-one-bug-with-regression-test, from £295 after bounded reproduction and a fixed repair quote. A dependency-wide type migration needs separate scope. These are untested offer prices, not demonstrated willingness to pay.

  • No code, keys, private repository invitations or complete logs at first contact.
  • No live deployment or weakened release check is authorised by this guide; the account holder approves publication.

Sources and limits