auth.ts

import NextAuth from "next-auth";
import Credentials from "next-auth/providers/credentials";

import { authConfig } from "./auth.config";

export const { handlers, signIn, signOut, auth } = NextAuth({
  ...authConfig,
  providers: [
    Credentials({
      // You can specify which fields should be submitted, by adding keys to the `credentials` object.
      // e.g. domain, username, password, 2FA token, etc.
      credentials: {
        email: {},
        password: {},
      },
      authorize: async (_credentials) => {
        let user = null;

        // logic to salt and hash password
        //const pwHash = saltAndHashPassword(credentials.password);

        // logic to verify if user exists
        //user = await getUserFromDb(credentials.email, pwHash);

        user = { id: "test", email: "test@test.test" };

        if (!user) {
          // No user found, so this is their first attempt to login
          // meaning this is also the place you could do registration
          throw new Error("User not found.");
        }

        // return user object with the their profile data
        return user;
      },
    }),
  ],
  pages: { signIn: "/sign-in" },
});