Creating sessions

import express from "express"import { buildSchema } from 'graphql';import { graphqlHTTP } from 'express-graphql';import { verifySession } from "supertokens-node/recipe/session/framework/express";import { SessionRequest } from "supertokens-node/framework/express";import Session from "supertokens-node/recipe/session";
// ...
let app = express();
var GraphQLSchema = buildSchema(`  type Mutation {      login(email: String, password: String): String  }`);
function getResolvers(req: any, res: any) {    return {        login: async ({ email, password }: { email: string, password: string }) => {            return new Promise(async (resolve, reject) => {                try {                    // TODO: Validate credentials                    let userIdentifier = "userId"                    let session = await Session.createNewSession(res, userIdentifier);                    resolve("Logged In");                } catch (e) {                    reject(e);                }            });        },    };}
app.use("/graphQL", verifySession({ sessionRequired: false }), graphqlHTTP(async (req, res) => {    return {        schema: GraphQLSchema,        rootValue: getResolvers(req, res),        context: {            session: (req as SessionRequest).session,        }    };}))