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(req, 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,
        }
    };
}))