pages-router on main [+] via v22.11.0 λ bun run build$ next build ▲ Next.js 15.5.1 - Environments: .env Linting and checking validity of types ..Failed to compile..next/types/validator.ts:52:11Type error: Type 'typeof import("C:/Users/augie/dev/pages-router/src/pages/api/trpc/[trpc]")' does not satisfy the expected type 'ApiRouteConfig'. The types returned by 'default(...)' are incompatible between these types. Type 'unknown' is not assignable to type 'void | Response | Promise<void | Response>'. 50 | { 51 | const handler = {} as typeof import("../../src/pages/api/trpc/[trpc].js")> 52 | handler satisfies ApiRouteConfig | ^ 53 | } 54 | 55 |Next.js build worker exited with code: 1 and signal: nullerror: script "build" exited with code 1
pages-router on main [+] via v22.11.0 λ bun run build$ next build ▲ Next.js 15.5.1 - Environments: .env Linting and checking validity of types ..Failed to compile..next/types/validator.ts:52:11Type error: Type 'typeof import("C:/Users/augie/dev/pages-router/src/pages/api/trpc/[trpc]")' does not satisfy the expected type 'ApiRouteConfig'. The types returned by 'default(...)' are incompatible between these types. Type 'unknown' is not assignable to type 'void | Response | Promise<void | Response>'. 50 | { 51 | const handler = {} as typeof import("../../src/pages/api/trpc/[trpc].js")> 52 | handler satisfies ApiRouteConfig | ^ 53 | } 54 | 55 |Next.js build worker exited with code: 1 and signal: nullerror: script "build" exited with code 1
It appears this bug was introduced with the release of Next 15.5.0 when the file
.next/types/validator.ts
.next/types/validator.ts
is created at build time.
Here are the contents of
[trpc].ts
[trpc].ts
import { createNextApiHandler } from "@trpc/server/adapters/next";import { env } from "~/env";import { appRouter } from "~/server/api/root";import { createTRPCContext } from "~/server/api/trpc";// export API handlerexport default createNextApiHandler({ router: appRouter, createContext: createTRPCContext, onError: env.NODE_ENV === "development" ? ({ path, error }) => { console.error( `❌ tRPC failed on ${path ?? "<no-path>"}: ${error.message}`, ); } : undefined,});
import { createNextApiHandler } from "@trpc/server/adapters/next";import { env } from "~/env";import { appRouter } from "~/server/api/root";import { createTRPCContext } from "~/server/api/trpc";// export API handlerexport default createNextApiHandler({ router: appRouter, createContext: createTRPCContext, onError: env.NODE_ENV === "development" ? ({ path, error }) => { console.error( `❌ tRPC failed on ${path ?? "<no-path>"}: ${error.message}`, ); } : undefined,});