NextAuth: link in console for development

auth.ts

import { type NextAuthOptions } from "next-auth";
import EmailProvider from "next-auth/providers/email";

import { ConsoleEmailLink } from "./dev.auth.ts";

/**
 * ConsoleEmailLink will print a login link to the console.
 * Enables you to login while developing without internet,
 * and makes local setup easier.
 */
export const authOptions: NextAuthOptions = {
  // [...your existing options]
  providers: [
    env.NODE_ENV === "development"
      ? ConsoleEmailLink()
      : EmailProvider({
          server: env.EMAIL_URL,
          from: env.EMAIL_FROM,
        }),
  ],
};

dev.auth.ts

import type { EmailConfig } from "next-auth/providers/email";

export function ConsoleEmailLink(): EmailConfig {
  return {
    id: "email",
    type: "email",
    name: "Email",
    server: { host: "localhost", port: 25, auth: { user: "", pass: "" } },
    from: "NextAuth <[email protected]>",
    maxAge: 24 * 60 * 60,
    async sendVerificationRequest({ url }) {
      console.log(`----------- <ConsoleEmail>  -----------`);
      console.log(JSON.stringify({ subject: "Sign in", url }, undefined, 2));
      console.log(`----------- </ConsoleEmail> -----------`);
    },
    options: { server: undefined, from: "console-email@local" },
  };
}