Feature request: defaultOnError

[sachinahya]

We're using TanStack Router with tRPC and TanStack Query (without Start) on a client-side app.

We use the onError callback to catch NOT_FOUND errors from tRPC and translate them to notFound so that they trigger the notFoundComponent rather than the errorComponent. Currently this has to be registered on every route via a helper function:

// utils/trpc.ts
export function throwNotFoundOnTrpcNotFound(error: unknown): void {
  if (error instanceof TRPCClientError && error.data?.code === 'NOT_FOUND') {
    throw notFound();
  }
}

// route
export const Route = createFileRoute('/path')({
  loader: ...,
  onError: throwNotFoundOnTrpcNotFound,
  notFoundComponent: ...,
});

It would be useful and less error-prone if we could configure this behaviour globally for all routes. A defaultOnError callback similar to defaultOnCatch would be useful:

const router = createRouter({
  routeTree,
  defaultOnError: (error) => {
    if (error instanceof TRPCClientError && error.data?.code === 'NOT_FOUND') {
      throw notFound();
    }
  },
  // ...
});