Danijel Martinek
aac37fd9af
Code-quality reviewer flagged a stale 'try/catch' phrase in the jsdoc that didn't match the actual result.ok inspection pattern. Updated description to accurately describe how tRPC v11 middleware sees errors (returned result, not thrown exception) and how the middleware discriminates and rethrows. Pure docstring change — no behavioral or signature impact.
42 lines
1.5 KiB
TypeScript
42 lines
1.5 KiB
TypeScript
import { TRPCError } from "@trpc/server";
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import type { TRPC_ERROR_CODE_KEY } from "@trpc/server/rpc";
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import { t } from "./init";
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type ErrorCtor = new (...args: never[]) => Error;
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/**
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* Build a tRPC middleware that translates domain errors to TRPCError.
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*
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* Each tuple pairs a constructor with a TRPC error code. tRPC v11
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* middleware sees procedure throws as a returned `result` (not an
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* exception): `next()` resolves to `{ ok: false, error: TRPCError }`
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* where `error.cause` is the original domain error wrapped by
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* `getTRPCErrorFromUnknown`. The middleware checks `result.ok`,
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* matches `result.error.cause` against each `instanceof Ctor`, and
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* on a hit throws a fresh TRPCError with the configured code and the
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* original error preserved as `.cause`. Unmapped errors fall through
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* unchanged — tRPC's default INTERNAL_SERVER_ERROR wrapping applies
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* with the original error still reachable via `.cause`.
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*
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* Owned by features: each feature passes its own constructors in.
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* core-shared never enumerates feature-specific error classes.
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*/
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export function defineErrorMiddleware(
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map: ReadonlyArray<readonly [ErrorCtor, TRPC_ERROR_CODE_KEY]>,
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) {
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return t.middleware(async ({ next }) => {
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const result = await next();
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if (!result.ok) {
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const cause = result.error.cause;
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if (cause instanceof Error) {
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for (const [Ctor, code] of map) {
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if (cause instanceof Ctor) {
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throw new TRPCError({ code, message: cause.message, cause });
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}
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}
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}
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}
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return result;
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});
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}
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