Next.js 13.4 + NextAuth类型错误：'AuthOptions'无法赋值给'never'

错误原因 #

Next.js App Router的route.ts文件有严格的导出约束：仅允许导出HTTP方法处理函数（如GET、POST）、config或runtime这类特定字段。你当前在路由文件中导出了authOptions变量，这违反了类型检查规则，导致编译失败。

解决方案 #

将authOptions移到单独的非路由文件中，避免在route.ts里导出多余内容：

1. 创建lib/auth.ts文件，存放auth配置：

import { AuthOptions } from "next-auth";
import DiscordProvider from "next-auth/providers/discord";

export const authOptions: AuthOptions = {
  providers: [
    DiscordProvider({
      clientId: process.env.CLIENT_ID as string,
      clientSecret: process.env.CLIENT_SECRET as string,
    }),
  ],
  session: {
    strategy: "jwt",
  },
  secret: process.env.NEXTAUTH_SECRET,
};

2. 修改app/api/auth/[...nextauth]/route.ts，从外部导入配置：

import NextAuth from "next-auth";
import { authOptions } from "@/lib/auth";

const handler = NextAuth(authOptions);

export { handler as GET, handler as POST };

额外说明 #

后续如果需要在服务器组件、其他API路由中复用authOptions，直接从lib/auth.ts导入即可，既符合App Router的规范，也保证了代码的可维护性。

内容的提问来源于stack exchange，提问作者Luk