Danijel Martinek
ed59b4348f
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defineErrorMiddleware matched by instanceof only; the custom server's tsx-bound DI graph and the Next-compiled route handler each load their own copy of every error class, so mapped domain errors (e.g. UnauthenticatedError -> UNAUTHORIZED) fell through and surfaced as raw 500s — hit in production by a downstream app built from this template. Match on the canonical error name (probed from the constructor's string-literal this.name) with instanceof as the fast path; nameless classes stay identity-only so plain Errors never translate. ADR-027 records the decision and the now-load-bearing this.name convention. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>