This may be a better-auth issue, but I am in a critical time crunch and need to get something working so looking for any help possible. When running pnpm build I am getting this:

app/api/auth/[...all]/route.ts
Type error: Route "app/api/auth/[...all]/route.ts" has an invalid export:
  "unknown" is not a valid GET return type:
    Expected "void | Response | Promise<void | Response>", got "unknown".

Next.js build worker exited with code: 1 and signal: null

The route is:

import { auth } from "@/lib/auth";
import { toNextJsHandler } from "better-auth/next-js";

export const { GET, POST } = toNextJsHandler(auth.handler);