Error encountered with next-auth and the getServerSession function

Whenever I try to use the getServerSesssion function with all the necessary parameters, it results in a type error. In my code, I have the getServerAuthSession function defined as shown below:

import { authOptions } from '@/pages/api/auth/[...nextauth]';
import type { GetServerSidePropsContext } from 'next';
import { getServerSession } from 'next-auth/next';

export const getServerAuthSession = (ctx: {
  req: GetServerSidePropsContext['req'];
  res: GetServerSidePropsContext['res'];
}) => {
  return getServerSession(ctx.req, ctx.res, authOptions);
};

However, when attempting to make this call, I encounter the following type error:

The argument provided '[IncomingMessage & { cookies: Partial<{ [key: string]: string; }>; }, ServerResponse<IncomingMessage>, { adapter: Adapter; providers: OAuthConfig<...>[]; secret: string | undefined; cookies: { ...; }; callbacks: {}; }]' does not match the expected parameter of type 'GetServerSessionParams<GetServerSessionOptions>'.
  The structure '[IncomingMessage & { cookies: Partial<{ [key: string]: string; }>; }, ServerResponse<IncomingMessage>, { adapter: Adapter; providers: OAuthConfig<...>[]; secret: string | undefined; cookies: { ...; }; callbacks: {}; }]' is not compatible with '[IncomingMessage & { cookies: Partial<{ [key: string]: string; }>; }, ServerResponse<IncomingMessage>, GetServerSessionOptions]'.
    There is an issue with the second type element.
      The provided type '{ adapter: Adapter; providers: OAuthConfig<GoogleProfile>[]; secret: string | undefined; cookies: { sessionToken: { name: string; options: { httpOnly: boolean; sameSite: string; path: string; domain: string; secure: boolean; }; }; }; callbacks: {}; }' does not align with the expected type 'GetServerSessionOptions'.
        The detailed errors indicate a mismatch within different adapter properties and configurations.

I have followed the configuration guidelines outlined in the documentation available here: https://next-auth.js.org/configuration/nextjs

If anyone has any insights or suggestions, they would be greatly appreciated.

Answer №1

Encountering an error in your [...nextauth].ts file can be traced back to the use of an adapter type Adapter. This results in the authOptions passed as the 3rd parameter to getServerSession being incompatible with what is expected, leading to a type mismatch error between Adapter and DefaultAdapter.

You may find guidance on how to correctly implement adapters with TypeScript in next-auth within this section. It's worth noting that they import Adapter from "next-auth/adapters", but it is recommended to utilize an adapter of type DefaultAdapter in your authOptions object within the [...nextauth].ts file.

import { DefaultAdapter } from "next-auth/adapters";

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