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feat(core-shared): add defineErrorMiddleware factory + export t

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Factory takes [[ErrorCtor, TRPC_CODE], ...] tuples and returns a tRPC
middleware that translates matching domain errors to TRPCError. Discrim-
inates by instanceof; preserves original error as cause; unmapped
errors propagate (tRPC then wraps them as INTERNAL_SERVER_ERROR with
the original error as .cause — middleware does not interfere).

core-shared never enumerates feature errors — each feature passes its
own constructors in via integrations/api/procedures.ts (Tasks 3-7).

Also exports the `t` instance from trpc/init.ts so feature procedure
files can do t.procedure.use(...).

Also fixes tsconfig.json: rootDir set to "." and @/* path alias added
so test files using @/ resolve correctly under tsc --noEmit.

Refactor log: §1, §2, §4
Spec: R13–R17
This commit is contained in:
Danijel Martinek
2026-05-06 11:43:45 +02:00
parent 61baaae99a
commit e25b1f7a1c
6 changed files with 142 additions and 6 deletions
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12
docs/superpowers/refactor-logs/2026-05-06-input-output-unification.md
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@@ -15,11 +15,14 @@ doc-update items so docs are written once for the post-Plan-9 state.
## 1. Files added
(populated as work progresses)
- packages/core-shared/src/trpc/define-error-middleware.ts — middleware factory mapping [ErrorCtor, TRPC_CODE] tuples to TRPCError translation
- packages/core-shared/src/trpc/define-error-middleware.test.ts — 4 tests covering mapped translation, multiple codes, unmapped passthrough (verifies INTERNAL_SERVER_ERROR + cause preservation), cause preservation
## 2. Files modified
(populated as work progresses)
- packages/core-shared/src/trpc/init.ts — `t` instance now exported (was internal const) so feature procedures.ts can do `t.procedure.use(...)`
- packages/core-shared/package.json — added "./trpc/define-error-middleware" subpath export
- packages/core-shared/tsconfig.json — set `rootDir: "."` and added `@/*` path alias so test files using `@/` resolve correctly under `tsc --noEmit`
## 3. Pattern changes (code-level)
@@ -34,7 +37,10 @@ doc-update items so docs are written once for the post-Plan-9 state.
## 4. Error-middleware adoption
(populated when defineErrorMiddleware is wired in core-shared and consumed by features)
- core-shared infrastructure landed; feature routers will adopt in Tasks 3-7.
- Discriminator: `instanceof Ctor` (not error name string), so duck-typing is impossible — features pass their own class constructors.
- Cause preservation: TRPCError carries the original domain error in `.cause` for client structured-error inspection.
- Note on tRPC v11 behavior: unmapped errors still surface as `TRPCError(code: INTERNAL_SERVER_ERROR)` because tRPC's `createCaller` wraps all procedure errors. Our middleware does not interfere — the original error is preserved as `.cause` for inspection.
## 5. Public-API surface