add mongo adapter via mongoose

db/index.ts

@@ -3,11 +3,11 @@ import BookingModel, { Booking, BookingDocument } from './booking'
 import BillModel, { Bill } from './bill'
 import { BOOKING_STATUS } from './enums'
 
-let connectedPromise: Promise<typeof mongoose>
+let connectedPromise: Promise<mongoose.Mongoose>
 
-function connect(): Promise<typeof mongoose> {
+export function connect(): Promise<mongoose.Mongoose> {
   if (connectedPromise) {
-    return
+    return connectedPromise
   }
 
   connectedPromise = mongoose.connect(process.env.MONGO_URI, {

pages/api/auth/[...nextauth].ts

@@ -1,23 +1,30 @@
+import { NextApiRequest, NextApiResponse } from 'next'
 import NextAuth from "next-auth"
-import GithubProvider from "next-auth/providers/github"
 import EmailProvider from "next-auth/providers/email"
 
-export default NextAuth({
-  providers: [
-    EmailProvider({
-      server: {
-        host: "smtp.sendgrid.net",
-        port: 587,
-        auth: {
-          user: "apikey",
-          pass: process.env.SENDGRID_API_KEY,
+import { MongoDBAdapter } from "@next-auth/mongodb-adapter"
+import { connect } from "../../../db"
+import { Mongoose } from 'mongoose';
+
+let mongooseConnection: Mongoose;
+
+export default async function auth(req: NextApiRequest, res: NextApiResponse) {
+  return await NextAuth(req, res, {
+    adapter: MongoDBAdapter({ db: (await connect()).connection.db }),
+    providers: [
+      EmailProvider({
+        server: {
+          host: "smtp.sendgrid.net",
+          port: 587,
+          auth: {
+            user: "apikey",
+            pass: process.env.SENDGRID_API_KEY,
+          },
         },
-      },
-      from: process.env.FROM_EMAIL
-    }),
-    GithubProvider({
-      clientId: process.env.GITHUB_ID,
-      clientSecret: process.env.GITHUB_SECRET,
-    }),
-  ],
-})
+        from: process.env.FROM_EMAIL
+      }),
+    ],
+  })
+}
+
+