npm install @google-cloud/connect-datastore

const {Datastore} = require('@google-cloud/datastore');const {DatastoreStore} = require('@google-cloud/connect-datastore');const express = require('express');const session = require('express-session');const app = express();app.use(session({  store: newDatastoreStore({    kind: 'express-sessions',    // Optional: expire the session after this many milliseconds.    // note: datastore does not automatically delete all expired sessions    // you may want to run separate cleanup requests to remove expired sessions    // 0 means do not expire    expirationMs: 0,    dataset: new Datastore({      // For convenience, @google-cloud/datastore automatically looks for the      // GCLOUD_PROJECT environment variable. Or you can explicitly pass in a      // project ID here:      projectId: process.env.GCLOUD_PROJECT,      // For convenience, @google-cloud/datastore automatically looks for the      // GOOGLE_APPLICATION_CREDENTIALS environment variable. Or you can      // explicitly pass in that path to your key file here:      keyFilename: process.env.GOOGLE_APPLICATION_CREDENTIALS    })  }),  secret: 'my-secret'}));