add whatsapp-clone sample app (#1730)

This is a forked version of Urigo's [WhatsApp Clone](https://github.com/Urigo/WhatsApp-Clone-server), integrated with Hasura. Hasura GraphQL APIs are used in place of custom resolvers. A simple JWT server replaces the original auth server. Image uploads use the same Cloudinary APIs. [Original React Client](https://github.com/Urigo/WhatsApp-Clone-Client-React) has been updated to match Hasura APIs and typescript definitions have been generated using GraphQL Code Generator.
2024-12-15 01:12:56 +03:00 · 2019-03-19 12:15:41 +05:30 · 2019-03-19 12:15:41 +05:30 · 6223852e9d
commit 6223852e9d
parent 2777b45335
90 changed files with 19662 additions and 0 deletions
--- a/community/sample-apps/whatsapp-clone-typescript-react/README.md
+++ b/community/sample-apps/whatsapp-clone-typescript-react/README.md
@ -0,0 +1,67 @@
+# WhatsApp Clone
+The react client is a forked version of [urigo/whatsapp-client-react](https://github.com/Urigo/WhatsApp-Clone-Client-React) and the server is backed by Hasura GraphQL Engine
+
+- Checkout the [live app](https://whatsapp-clone.demo.hasura.app/).
+- Explore the backend using [Hasura
+  Console](https://whatsapp-clone.demo.hasura.app/console).
+
+## Running the app yourself
+
+#### Deploy Postgres and GraphQL Engine on Heroku:
+  
+  [![Deploy to
+  heroku](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/hasura/graphql-engine-heroku)
+- Get the Heroku app URL (say `whatsapp-clone.herokuapp.com`)
+- Clone this repo:
+  ```bash
+  git clone https://github.com/hasura/graphql-engine
+  cd graphql-engine/community/sample-apps/whatsapp-clone-typescript-react
+  ```
+- [Install Hasura CLI](https://docs.hasura.io/1.0/graphql/manual/hasura-cli/install-hasura-cli.html)
+- Apply the migrations:
+  ```bash
+  cd hasura 
+  hasura migrate apply --endpoint "https://whatsapp-clone.herokuapp.com"
+  ```
+
+#### Run the auth server
+
+  ```bash
+  cd auth-server
+  ```
+
+- Set the environment variables in `.env`
+
+- Install and run the app
+
+```bash
+  npm install
+  npm start
+```
+
+#### Run the react app
+
+  ```bash
+  cd react-app
+  ```
+
+- Set the environment variables in `.env`
+
+```bash
+  yarn install
+```
+
+- Modify the codegen.yml to include the correct endpoint and headers
+
+- Generate the graphql types by running
+
+```bash
+  gql-gen
+```
+This would generate the required types in `src/graphql/types`
+
+- Run the app
+
+```bash
+  yarn start
+```
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/.dockerignore
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/.dockerignore
@ -0,0 +1 @@
+node_modules
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/.gitignore
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/.gitignore
@ -0,0 +1,2 @@
+node_modules
+.env
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/Dockerfile
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/Dockerfile
@ -0,0 +1,17 @@
+FROM node:alpine
+
+RUN mkdir -p /opt/app
+
+RUN chown node:node /opt/app
+
+WORKDIR /opt/app
+
+COPY --chown=node:node package.json .
+
+USER node
+
+RUN npm install
+
+COPY --chown=node:node . .
+
+CMD npm start
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/Procfile
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/Procfile
@ -0,0 +1 @@
+web: npm start
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/README.md
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/README.md
@ -0,0 +1,101 @@
+# JWT Authentication server Boilerplate
+
+Sample JWT Authentication server for generating a JWT to use in the `Authentication` header by the built in JWT decoder in Hasura GraphQL Engine when started in JWT mode.
+
+## Getting Started
+
+### Deploy locally
+
+#### Local Prerequisites
+
+-   PostgreSQL up and accepting connections
+-   Hasura GraphQL engine up and accepting connections
+-   Node.js 8.9+ installed
+
+#### Local instructions
+
+Install NPM dependencies
+
+```bash
+npm install
+```
+
+Set environment variables. Open `.env` file and add the following env
+
+```bash
+ENCRYPTION_KEY=<replace_it_with_your_JWT_SECRET>
+DATABASE_URL=postgres://<username>:<password>@<host>:<port>/<database_name>
+CLOUDINARY_URL=<replace_it_with_your_cloudinary_url>
+PORT=8010
+```
+
+##### User Schema
+
+The following `users` table is assumed to be present in your schema. The table can have additional fields too.
+
+| name       | type    | nullable | unique | default | primary |
+| ---------- | ------- | -------- | ------ | ------- | ------- |
+| id         | Integer | no       | yes    |         | yes     |
+| username   | Text    | no       | yes    |         | no      |
+| password   | Text    | no       | no     |         | no      |
+| token      | Text    | no       | no     |         | no      |
+| created_at | Date    | no       | no     | now()   |         |
+
+Then start your app
+
+```bash
+npm start
+```
+
+## Usage
+
+### Signup/Login
+
+Once deployed or started locally, we can create an user using `/signup` API like below:
+
+```bash
+curl -H "Content-Type: application/json" \
+     -d'{"username": "test123", "password": "test123", "confirmPassword": "test123"}' \
+     http://localhost:8080/signup
+```
+
+On success, we get the response:
+
+```json
+{
+  "id": 1,
+  "username": "test123"
+}
+```
+
+We can also use `/login` API to fetch the user token:
+
+```bash
+curl -H "Content-Type: application/json" \
+     -d'{"username": "test123", "password": "test123"}' \
+     http://localhost:8080/login
+```
+
+On success, we get the response:
+
+```json
+{
+  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOjEsIm5hbWUiOiJ0ZXN0MTIzIiwiaWF0IjoxNTQwMjkyMzgyLjQwOSwiaHR0cHM6Ly9oYXN1cmEuaW8vand0L2NsYWltcyI6eyJ4LWhhc3VyYS1hbGxvd2VkLXJvbGVzIjpbImVkaXRvciIsInVzZXIiLCJtb2QiXSwieC1oYXN1cmEtdXNlci1pZCI6MSwieC1oYXN1cmEtZGVmYXVsdC1yb2xlIjoidXNlciJ9fQ.KtAUroqyBroBJL7O9og3Z4JnRkWNfr07cHQfeLarclU"
+}
+```
+
+### Authenticate JWT using GraphQL Engine
+
+The GraphQL engine comes with built in JWT authentication.  You will need to start the engine with the same secret/key as the JWT auth server using the environment variable `HASURA_GRAPHQL_JWT_SECRET` (HASURA_GRAPHQL_ACCESS_KEY is also required see the docs)
+
+In your GraphQL engine you will need to add permissions for a user named `user` with read permissions on the table and columns.
+
+A sample CURL command using the above token would be:
+
+```bash
+curl -X POST \
+  http://localhost:8081/v1alpha1/graphql \
+  -H 'Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxIiwibmFtZSI6InRlc3QxMjMiLCJpYXQiOjE1NDAzNzY4MTUuODUzLCJodHRwczovL2hhc3VyYS5pby9qd3QvY2xhaW1zIjp7IngtaGFzdXJhLWFsbG93ZWQtcm9sZXMiOlsiZWRpdG9yIiwidXNlciIsIm1vZCJdLCJ4LWhhc3VyYS11c2VyLWlkIjoiMSIsIngtaGFzdXJhLWRlZmF1bHQtcm9sZSI6InVzZXIiLCJ4LWhhc3VyYS1yb2xlIjoidXNlciJ9fQ.w9uj0FtesZOFUnwYT2KOWHr6IKWsDRuOC9G2GakBgMI' \
+  -H 'Content-Type: application/json' \
+  -d '{ "query": "{ table { column } }" }'
+```
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/app.js
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/app.js
@ -0,0 +1,81 @@
+/**
+ * Module dependencies.
+ */
+require('dotenv').config();
+
+const express = require('express');
+const bodyParser = require('body-parser');
+const chalk = require('chalk');
+const dotenv = require('dotenv');
+const passport = require('passport');
+const expressValidator = require('express-validator');
+const cors = require('cors');
+const cloudinary = require('cloudinary');
+const multer = require('multer');
+const tmp = require('tmp');
+
+/**
+ * Load environment variables from .env file, where API keys and passwords are configured.
+ */
+dotenv.load({ path: '.env' });
+
+if(!process.env.ENCRYPTION_KEY) {
+  throw new Error('JWT encryption key required')
+}
+
+/**
+ * Controllers (route handlers).
+ */
+
+/**
+ * Create Express server.
+ */
+const app = express();
+/**
+ * Express configuration.
+ */
+app.use(cors());
+app.set('host', '0.0.0.0');
+app.set('port', process.env.PORT || 8080);
+app.set('json spaces', 2); // number of spaces for indentation
+app.use(bodyParser.json());
+app.use(expressValidator());
+app.use(passport.initialize());
+app.use(passport.session());
+
+const userController = require('./controllers/user');
+
+const upload = multer({
+  dest: tmp.dirSync({ unsafeCleanup: true }).name,
+})
+const uploadProfilePic = (filePath) => {
+	return new Promise((resolve, reject) => {
+	  cloudinary.v2.uploader.upload(filePath, (error, result) => {
+	    if (error) {
+	      reject(error)
+	    } else {
+	      resolve(result)
+	    }
+	  })
+	})
+}
+
+app.post('/login', userController.postLogin);
+app.post('/signup', userController.postSignup);
+app.post('/upload-profile-pic', upload.single('file'), async (req, res, done) => {
+  try {
+    res.json(await uploadProfilePic(req.file.path))
+  } catch (e) {
+    done(e)
+  }
+})
+
+/**
+ * Start Express server.
+ */
+app.listen(app.get('port'), () => {
+  console.log('%s App is running at http://localhost:%d in %s mode', chalk.green('✓'), app.get('port'), app.get('env'));
+  console.log('  Press CTRL-C to stop\n');
+});
+
+module.exports = app;
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/config/passport.js
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/config/passport.js
@ -0,0 +1,28 @@
+const passport = require('passport');
+const { Strategy: LocalStrategy } = require('passport-local');
+const { User } = require('../db/schema');
+
+passport.use(
+  new LocalStrategy({
+    usernameField: 'username',
+    passwordField: 'password'
+  },
+  function (username, password, done) {
+    User
+      .query()
+      .where('username', username)
+      .first()
+      .then(function (user) {
+        if (!user) { return done('Unknown user'); }
+        user.verifyPassword(password, function (err, passwordCorrect) {
+          if (err) { return done(err); }
+          if (!passwordCorrect) { return done('Invalid password'); }
+          return done(null, user)
+        })
+      }).catch(function (err) {
+        done(err)
+      })
+  }
+));
+
+module.exports = passport;
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/controllers/user.js
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/controllers/user.js
@ -0,0 +1,83 @@
+const passport = require('../config/passport');
+const { User } = require('../db/schema');
+const { errorHandler } = require('../db/errors');
+const jwt = require('jsonwebtoken');
+
+/**
+ * POST /login
+ * Sign in using username and password.
+ */
+exports.postLogin = async (req, res, next) => {
+  req.assert('username', 'Username is not valid').notEmpty();
+  req.assert('password', 'Password cannot be blank').notEmpty();
+
+  const errors = req.validationErrors();
+
+  if (errors) {
+    return res.status(400).json({'errors': errors});
+  }
+
+  passport.authenticate('local', (err, user) => {
+    if (err) { return handleResponse(res, 400, {'error': err})}
+    if (user) {
+
+      const tokenContents = {
+        sub: '' + user.id,
+        name: user.username,
+        iat: Date.now() / 1000,
+        "https://hasura.io/jwt/claims": {
+          "x-hasura-allowed-roles": ["mine","user"],
+          "x-hasura-user-id": '' + user.id,
+          "x-hasura-default-role": "user",
+          "x-hasura-role": "user"
+        }
+      }
+
+      handleResponse(res, 200, {
+        token: jwt.sign(tokenContents, process.env.ENCRYPTION_KEY)
+      });
+    }
+  })(req, res, next);
+};
+
+
+/**
+ * POST /signup
+ * Create a new local account.
+ */
+exports.postSignup = async (req, res, next) => {
+  req.assert('name', 'Name is not valid').notEmpty();
+  req.assert('username', 'Username is not valid').notEmpty();
+  req.assert('password', 'Password must be at least 4 characters long').len(4);
+  req.assert('confirmPassword', 'Passwords do not match').equals(req.body.password);
+
+  const errors = req.validationErrors();
+
+  if (errors) {
+    return res.status(400).json({'errors': errors});
+  }
+
+  try {
+    await User.query()
+    .allowInsert('[name, username, password]')
+    .insert({
+      name: req.body.name,
+      username: req.body.username,
+      password: req.body.password
+    });
+  } catch (err) {
+    errorHandler(err, res);
+    return;
+  }
+  passport.authenticate('local', (err, user, info) => {
+    if (err) {  return handleResponse(res, 400, {'error': err})}
+    if (user) {
+      handleResponse(res, 200, user.getUser());
+    }
+  })(req, res, next);
+};
+
+
+function handleResponse(res, code, statusMsg) {
+  res.status(code).json(statusMsg);
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/db/errors.js
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/db/errors.js
@ -0,0 +1,120 @@
+const {
+  ValidationError,
+  NotFoundError
+} = require('objection');
+
+const {
+  DBError,
+  ConstraintViolationError,
+  UniqueViolationError,
+  NotNullViolationError,
+  ForeignKeyViolationError,
+  CheckViolationError,
+  DataError
+} = require('objection-db-errors');
+
+// In this example `res` is an express response object.
+function errorHandler(err, res) {
+  if (err instanceof ValidationError) {
+    switch (err.type) {
+      case 'ModelValidation':
+        res.status(400).send({
+          message: err.message,
+          type: 'ModelValidation',
+          data: err.data
+        });
+        break;
+      case 'RelationExpression':
+        res.status(400).send({
+          message: err.message,
+          type: 'InvalidRelationExpression',
+          data: {}
+        });
+        break;
+      case 'UnallowedRelation':
+        res.status(400).send({
+          message: err.message,
+          type: 'UnallowedRelation',
+          data: {}
+        });
+        break;
+      case 'InvalidGraph':
+        res.status(400).send({
+          message: err.message,
+          type: 'InvalidGraph',
+          data: {}
+        });
+        break;
+      default:
+        res.status(400).send({
+          message: err.message,
+          type: 'UnknownValidationError',
+          data: {}
+        });
+        break;
+    }
+  } else if (err instanceof NotFoundError) {
+    res.status(404).send({
+      message: err.message,
+      type: 'NotFound',
+      data: {}
+    });
+  } else if (err instanceof UniqueViolationError) {
+    res.status(409).send({
+      message: err.message,
+      type: 'UniqueViolation',
+      data: {
+        columns: err.columns,
+        table: err.table,
+        constraint: err.constraint
+      }
+    });
+  } else if (err instanceof NotNullViolationError) {
+    res.status(400).send({
+      message: err.message,
+      type: 'NotNullViolation',
+      data: {
+        column: err.column,
+        table: err.table,
+      }
+    });
+  } else if (err instanceof ForeignKeyViolationError) {
+    res.status(409).send({
+      message: err.message,
+      type: 'ForeignKeyViolation',
+      data: {
+        table: err.table,
+        constraint: err.constraint
+      }
+    });
+  } else if (err instanceof CheckViolationError) {
+    res.status(400).send({
+      message: err.message,
+      type: 'CheckViolation',
+      data: {
+        table: err.table,
+        constraint: err.constraint
+      }
+    });
+  } else if (err instanceof DataError) {
+    res.status(400).send({
+      message: err.message,
+      type: 'InvalidData',
+      data: {}
+    });
+  } else if (err instanceof DBError) {
+    res.status(500).send({
+      message: err.message,
+      type: 'UnknownDatabaseError',
+      data: {}
+    });
+  } else {
+    res.status(500).send({
+      message: err.message,
+      type: 'UnknownError',
+      data: {}
+    });
+  }
+}
+
+module.exports = { errorHandler }
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/db/migrations/20180917160913_users.js
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/db/migrations/20180917160913_users.js
@ -0,0 +1,13 @@
+
+exports.up = function(knex, Promise) {
+  return knex.schema.createTable('users', (table) => {
+    table.increments();
+    table.string('username').unique().notNullable();
+    table.string('password').notNullable();
+    table.timestamp('created_at').notNullable().defaultTo(knex.raw('now()'));
+  });
+};
+
+exports.down = function(knex, Promise) {
+  return knex.schema.dropTable('users');
+};
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/db/schema.js
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/db/schema.js
@ -0,0 +1,49 @@
+const { promisify } = require('util');
+const Knex = require('knex');
+const connection = require('../knexfile');
+const { Model } = require('objection');
+const bcrypt = require('bcrypt');
+const crypto = require('crypto');
+
+const knexConnection = Knex(connection);
+
+Model.knex(knexConnection);
+
+class User extends Model {
+  static get tableName () {
+    return 'users'
+  }
+
+  static get idColumn() {
+    return 'id';
+  }
+
+  getUser() {
+    return {
+      'id': this.id,
+      'username': this.username,
+    }
+  }
+
+  async $beforeInsert () {
+    const salt = bcrypt.genSaltSync();
+    this.password = await bcrypt.hash(this.password, salt)
+  }
+
+  verifyPassword (password, callback) {
+    bcrypt.compare(password, this.password, callback)
+  };
+
+  static get jsonSchema () {
+    return {
+      type: 'object',
+      required: ['username'],
+      properties: {
+        id: {type: 'integer'},
+        username: {type: 'string', minLength: 1, maxLength: 255},
+      }
+    }
+  }
+}
+
+module.exports = { User }
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/knexfile.js
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/knexfile.js
@ -0,0 +1,14 @@
+// Update with your config settings.
+
+const databaseName = "postgres";
+const pg = require('pg');
+
+const connection_url = process.env.DATABASE_URL || `postgres://postgres:@localhost:5432/${databaseName}`;
+
+module.exports = {
+  client: 'pg',
+  connection: connection_url,
+  migrations: {
+    directory: __dirname + '/db/migrations'
+  }
+};
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/package-lock.json
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/package-lock.json
--- a/community/sample-apps/whatsapp-clone-typescript-react/auth-server/package.json
+++ b/community/sample-apps/whatsapp-clone-typescript-react/auth-server/package.json
@ -0,0 +1,42 @@
+{
+  "name": "passport-js-auth-webhook",
+  "version": "1.0.0",
+  "engines": {
+    "node": "8.9.1"
+  },
+  "description": "A boilerplate for Hasura Graphql Engine auth webhook with passport js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node app.js",
+    "lint": "eslint \"**/*.js\""
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/hasura/graphql-engine.git"
+  },
+  "author": "Aravind Shankar",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/hasura/graphql-engine/issues"
+  },
+  "homepage": "https://github.com/hasura/graphql-engine/tree/master/community/boilerplates/auth-webhooks/passport-js#readme",
+  "dependencies": {
+    "bcrypt": "3.0.0",
+    "body-parser": "^1.18.3",
+    "chalk": "^2.4.1",
+    "cloudinary": "^1.13.2",
+    "cors": "^2.8.5",
+    "dotenv": "^6.2.0",
+    "express": "^4.16.4",
+    "express-validator": "^5.3.0",
+    "jsonwebtoken": "^8.3.0",
+    "knex": "^0.15.2",
+    "multer": "^1.4.1",
+    "objection": "^1.3.0",
+    "objection-db-errors": "^1.0.0",
+    "passport": "^0.4.0",
+    "passport-local": "^1.0.0",
+    "pg": "^7.5.0",
+    "tmp": "0.0.33"
+  }
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/hasura/config.yaml
+++ b/community/sample-apps/whatsapp-clone-typescript-react/hasura/config.yaml
@ -0,0 +1 @@
+endpoint: http://localhost:8080
--- a/community/sample-apps/whatsapp-clone-typescript-react/hasura/migrations/1552975473860_whatsapp-db.up.sql
+++ b/community/sample-apps/whatsapp-clone-typescript-react/hasura/migrations/1552975473860_whatsapp-db.up.sql
@ -0,0 +1,427 @@
+--
+-- PostgreSQL database dump
+--
+
+-- Dumped from database version 10.5 (Debian 10.5-1.pgdg90+1)
+-- Dumped by pg_dump version 10.1
+
+-- Started on 2019-03-11 11:42:52 IST
+
+-- TOC entry 285 (class 1255 OID 24760)
+-- Name: truncate_tables(character varying); Type: FUNCTION; Schema: public; Owner: -
+--
+
+CREATE FUNCTION truncate_tables(username character varying) RETURNS void
+    LANGUAGE plpgsql
+    AS $$
+DECLARE
+    statements CURSOR FOR
+        SELECT tablename FROM pg_tables
+        WHERE tableowner = username AND schemaname = 'public';
+BEGIN
+    FOR stmt IN statements LOOP
+        EXECUTE 'TRUNCATE TABLE ' || quote_ident(stmt.tablename) || ' CASCADE;';
+    END LOOP;
+END;
+$$;
+
+
+SET default_tablespace = '';
+
+SET default_with_oids = false;
+
+--
+-- TOC entry 216 (class 1259 OID 16585)
+-- Name: chat; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE chat (
+    id integer NOT NULL,
+    name text,
+    picture text,
+    created_at timestamp with time zone DEFAULT now() NOT NULL,
+    owner_id integer
+);
+
+
+--
+-- TOC entry 3059 (class 0 OID 0)
+-- Dependencies: 216
+-- Name: TABLE chat; Type: COMMENT; Schema: public; Owner: -
+--
+
+COMMENT ON TABLE chat IS 'chats having an owner is a group';
+
+
+--
+-- TOC entry 3060 (class 0 OID 0)
+-- Dependencies: 216
+-- Name: COLUMN chat.owner_id; Type: COMMENT; Schema: public; Owner: -
+--
+
+COMMENT ON COLUMN chat.owner_id IS 'If owner_id is present, its a group chat';
+
+
+--
+-- TOC entry 217 (class 1259 OID 16592)
+-- Name: chat_group_admins; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE chat_group_admins (
+    chat_id integer NOT NULL,
+    user_id integer NOT NULL
+);
+
+
+--
+-- TOC entry 3061 (class 0 OID 0)
+-- Dependencies: 217
+-- Name: TABLE chat_group_admins; Type: COMMENT; Schema: public; Owner: -
+--
+
+COMMENT ON TABLE chat_group_admins IS 'chat group admin mapping';
+
+
+--
+-- TOC entry 219 (class 1259 OID 16597)
+-- Name: chat_users; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE chat_users (
+    chat_id integer NOT NULL,
+    user_id integer NOT NULL
+);
+
+
+--
+-- TOC entry 3062 (class 0 OID 0)
+-- Dependencies: 219
+-- Name: TABLE chat_users; Type: COMMENT; Schema: public; Owner: -
+--
+
+COMMENT ON TABLE chat_users IS 'chat user mapping';
+
+
+--
+-- TOC entry 220 (class 1259 OID 16608)
+-- Name: message; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE message (
+    id integer NOT NULL,
+    content text NOT NULL,
+    created_at timestamp with time zone DEFAULT now() NOT NULL,
+    sender_id integer,
+    chat_id integer
+);
+
+
+--
+-- TOC entry 222 (class 1259 OID 16617)
+-- Name: recipient; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE recipient (
+    id integer NOT NULL,
+    received_at timestamp with time zone,
+    read_at timestamp with time zone,
+    user_id integer NOT NULL,
+    message_id integer NOT NULL
+);
+
+
+--
+-- TOC entry 224 (class 1259 OID 16622)
+-- Name: users; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE users (
+    id integer NOT NULL,
+    username text NOT NULL,
+    password text NOT NULL,
+    name text DEFAULT ''''::text,
+    picture text,
+    created_at timestamp with time zone DEFAULT now() NOT NULL
+);
+
+
+--
+-- TOC entry 218 (class 1259 OID 16595)
+-- Name: chat_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE chat_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- TOC entry 3063 (class 0 OID 0)
+-- Dependencies: 218
+-- Name: chat_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE chat_id_seq OWNED BY chat.id;
+
+
+--
+-- TOC entry 221 (class 1259 OID 16615)
+-- Name: message_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE message_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- TOC entry 3064 (class 0 OID 0)
+-- Dependencies: 221
+-- Name: message_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE message_id_seq OWNED BY message.id;
+
+
+--
+-- TOC entry 226 (class 1259 OID 32940)
+-- Name: message_user; Type: VIEW; Schema: public; Owner: -
+--
+
+CREATE VIEW message_user AS
+ SELECT message.id,
+    message.content,
+    message.created_at,
+    message.sender_id,
+    message.chat_id
+   FROM message
+  ORDER BY message.id DESC;
+
+
+--
+-- TOC entry 223 (class 1259 OID 16620)
+-- Name: recipient_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE recipient_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- TOC entry 3065 (class 0 OID 0)
+-- Dependencies: 223
+-- Name: recipient_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE recipient_id_seq OWNED BY recipient.id;
+
+
+--
+-- TOC entry 225 (class 1259 OID 16630)
+-- Name: users_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE users_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- TOC entry 3066 (class 0 OID 0)
+-- Dependencies: 225
+-- Name: users_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE users_id_seq OWNED BY users.id;
+
+
+--
+-- TOC entry 2892 (class 2604 OID 16632)
+-- Name: chat id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat ALTER COLUMN id SET DEFAULT nextval('chat_id_seq'::regclass);
+
+
+--
+-- TOC entry 2894 (class 2604 OID 16634)
+-- Name: message id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY message ALTER COLUMN id SET DEFAULT nextval('message_id_seq'::regclass);
+
+
+--
+-- TOC entry 2895 (class 2604 OID 16635)
+-- Name: recipient id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY recipient ALTER COLUMN id SET DEFAULT nextval('recipient_id_seq'::regclass);
+
+
+--
+-- TOC entry 2898 (class 2604 OID 16636)
+-- Name: users id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY users ALTER COLUMN id SET DEFAULT nextval('users_id_seq'::regclass);
+
+
+--
+-- TOC entry 2902 (class 2606 OID 16638)
+-- Name: chat_group_admins chat_group_admins_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat_group_admins
+    ADD CONSTRAINT chat_group_admins_pkey PRIMARY KEY (chat_id, user_id);
+
+
+--
+-- TOC entry 2900 (class 2606 OID 16640)
+-- Name: chat chat_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat
+    ADD CONSTRAINT chat_pkey PRIMARY KEY (id);
+
+
+--
+-- TOC entry 2904 (class 2606 OID 16642)
+-- Name: chat_users chat_users_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat_users
+    ADD CONSTRAINT chat_users_pkey PRIMARY KEY (chat_id, user_id);
+
+
+--
+-- TOC entry 2906 (class 2606 OID 16646)
+-- Name: message message_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY message
+    ADD CONSTRAINT message_pkey PRIMARY KEY (id);
+
+
+--
+-- TOC entry 2908 (class 2606 OID 16648)
+-- Name: recipient recipient_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY recipient
+    ADD CONSTRAINT recipient_pkey PRIMARY KEY (user_id, message_id);
+
+
+--
+-- TOC entry 2910 (class 2606 OID 16650)
+-- Name: users users_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY users
+    ADD CONSTRAINT users_pkey PRIMARY KEY (id);
+
+
+--
+-- TOC entry 2912 (class 2606 OID 16651)
+-- Name: chat_group_admins chat_group_admins_chat_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat_group_admins
+    ADD CONSTRAINT chat_group_admins_chat_id_fkey FOREIGN KEY (chat_id) REFERENCES chat(id);
+
+
+--
+-- TOC entry 2913 (class 2606 OID 16656)
+-- Name: chat_group_admins chat_group_admins_user_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat_group_admins
+    ADD CONSTRAINT chat_group_admins_user_id_fkey FOREIGN KEY (user_id) REFERENCES users(id);
+
+
+--
+-- TOC entry 2911 (class 2606 OID 16661)
+-- Name: chat chat_owner_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat
+    ADD CONSTRAINT chat_owner_id_fkey FOREIGN KEY (owner_id) REFERENCES users(id);
+
+
+--
+-- TOC entry 2914 (class 2606 OID 16666)
+-- Name: chat_users chat_users_chat_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat_users
+    ADD CONSTRAINT chat_users_chat_id_fkey FOREIGN KEY (chat_id) REFERENCES chat(id);
+
+
+--
+-- TOC entry 2915 (class 2606 OID 16671)
+-- Name: chat_users chat_users_user_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY chat_users
+    ADD CONSTRAINT chat_users_user_id_fkey FOREIGN KEY (user_id) REFERENCES users(id);
+
+
+--
+-- TOC entry 2916 (class 2606 OID 16676)
+-- Name: message message_chat_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY message
+    ADD CONSTRAINT message_chat_id_fkey FOREIGN KEY (chat_id) REFERENCES chat(id);
+
+
+--
+-- TOC entry 2917 (class 2606 OID 16681)
+-- Name: message message_sender_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY message
+    ADD CONSTRAINT message_sender_id_fkey FOREIGN KEY (sender_id) REFERENCES users(id);
+
+
+--
+-- TOC entry 2918 (class 2606 OID 16686)
+-- Name: recipient recipient_message_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY recipient
+    ADD CONSTRAINT recipient_message_id_fkey FOREIGN KEY (message_id) REFERENCES message(id);
+
+
+--
+-- TOC entry 2919 (class 2606 OID 16691)
+-- Name: recipient recipient_user_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY recipient
+    ADD CONSTRAINT recipient_user_id_fkey FOREIGN KEY (user_id) REFERENCES users(id);
+
+
+-- Completed on 2019-03-11 11:42:53 IST
+
+--
+-- PostgreSQL database dump complete
+--
+
--- a/community/sample-apps/whatsapp-clone-typescript-react/hasura/migrations/1552975473860_whatsapp-db.up.yaml
+++ b/community/sample-apps/whatsapp-clone-typescript-react/hasura/migrations/1552975473860_whatsapp-db.up.yaml
@ -0,0 +1,416 @@
+- type: replace_metadata
+  args:
+    functions: []
+    query_templates: []
+    remote_schemas: []
+    tables:
+    - array_relationships: []
+      delete_permissions: []
+      event_triggers: []
+      insert_permissions: []
+      object_relationships:
+      - comment: null
+        name: chat
+        using:
+          manual_configuration:
+            column_mapping:
+              chat_id: id
+            remote_table: chat
+      - comment: null
+        name: sender
+        using:
+          manual_configuration:
+            column_mapping:
+              sender_id: id
+            remote_table: users
+      select_permissions:
+      - comment: null
+        permission:
+          allow_aggregations: true
+          columns:
+          - chat_id
+          - content
+          - created_at
+          - id
+          - sender_id
+          filter:
+            _or:
+            - sender_id:
+                _eq: X-Hasura-User-Id
+            - chat:
+                users:
+                  user_id:
+                    _eq: X-Hasura-User-Id
+          limit: 1
+        role: user
+      table: message_user
+      update_permissions: []
+    - array_relationships: []
+      delete_permissions:
+      - comment: null
+        permission:
+          filter: {}
+        role: user
+      event_triggers: []
+      insert_permissions:
+      - comment: null
+        permission:
+          check: {}
+          columns:
+          - chat_id
+          - user_id
+          set: {}
+        role: user
+      object_relationships: []
+      select_permissions:
+      - comment: null
+        permission:
+          allow_aggregations: false
+          columns:
+          - chat_id
+          - user_id
+          filter: {}
+        role: user
+      table: chat_group_admins
+      update_permissions:
+      - comment: null
+        permission:
+          columns:
+          - chat_id
+          - user_id
+          filter: {}
+          set: {}
+        role: user
+    - array_relationships:
+      - comment: null
+        name: users
+        using:
+          foreign_key_constraint_on:
+            column: chat_id
+            table: chat_users
+      - comment: null
+        name: messages
+        using:
+          foreign_key_constraint_on:
+            column: chat_id
+            table: message
+      delete_permissions:
+      - comment: null
+        permission:
+          filter:
+            _or:
+            - owner_id:
+                _eq: X-Hasura-User-Id
+            - users:
+                user_id:
+                  _eq: X-Hasura-User-Id
+        role: user
+      event_triggers: []
+      insert_permissions:
+      - comment: null
+        permission:
+          check:
+            _or:
+            - owner_id:
+                _eq: X-Hasura-User-Id
+            - users:
+                user_id:
+                  _eq: X-Hasura-User-Id
+            - owner_id:
+                _is_null: true
+          columns:
+          - created_at
+          - id
+          - name
+          - owner_id
+          - picture
+          set: {}
+        role: user
+      object_relationships:
+      - comment: null
+        name: owner
+        using:
+          foreign_key_constraint_on: owner_id
+      select_permissions:
+      - comment: null
+        permission:
+          allow_aggregations: true
+          columns:
+          - created_at
+          - id
+          - name
+          - owner_id
+          - picture
+          filter:
+            _or:
+            - owner_id:
+                _eq: X-Hasura-User-Id
+            - users:
+                user_id:
+                  _eq: X-Hasura-User-Id
+        role: user
+      table: chat
+      update_permissions:
+      - comment: null
+        permission:
+          columns:
+          - created_at
+          - id
+          - name
+          - owner_id
+          - picture
+          filter:
+            _or:
+            - owner_id:
+                _eq: X-Hasura-User-Id
+            - users:
+                user_id:
+                  _eq: X-Hasura-User-Id
+          set: {}
+        role: user
+    - array_relationships: []
+      delete_permissions:
+      - comment: null
+        permission:
+          filter:
+            _or:
+            - user_id:
+                _eq: X-Hasura-User-Id
+            - chat:
+                users:
+                  user_id:
+                    _eq: X-Hasura-User-Id
+        role: user
+      event_triggers: []
+      insert_permissions:
+      - comment: null
+        permission:
+          check: {}
+          columns:
+          - chat_id
+          - user_id
+          set: {}
+        role: user
+      object_relationships:
+      - comment: null
+        name: chat
+        using:
+          foreign_key_constraint_on: chat_id
+      - comment: null
+        name: user
+        using:
+          foreign_key_constraint_on: user_id
+      select_permissions:
+      - comment: null
+        permission:
+          allow_aggregations: true
+          columns:
+          - chat_id
+          - user_id
+          filter:
+            _or:
+            - user_id:
+                _eq: X-Hasura-User-Id
+            - chat:
+                users:
+                  user_id:
+                    _eq: X-Hasura-User-Id
+        role: user
+      table: chat_users
+      update_permissions: []
+    - array_relationships: []
+      delete_permissions:
+      - comment: null
+        permission:
+          filter:
+            id:
+              _eq: X-Hasura-User-Id
+        role: user
+      event_triggers: []
+      insert_permissions:
+      - comment: null
+        permission:
+          check:
+            id:
+              _eq: X-Hasura-User-Id
+          columns:
+          - created_at
+          - id
+          - name
+          - password
+          - picture
+          - username
+          set: {}
+        role: user
+      object_relationships: []
+      select_permissions:
+      - comment: null
+        permission:
+          allow_aggregations: false
+          columns:
+          - created_at
+          - id
+          - name
+          - password
+          - picture
+          - username
+          filter: {}
+        role: user
+      - comment: null
+        permission:
+          allow_aggregations: false
+          columns:
+          - created_at
+          - id
+          - name
+          - password
+          - picture
+          - username
+          filter:
+            id:
+              _eq: X-Hasura-User-Id
+        role: mine
+      table: users
+      update_permissions:
+      - comment: null
+        permission:
+          columns:
+          - created_at
+          - id
+          - name
+          - password
+          - picture
+          - username
+          filter:
+            id:
+              _eq: X-Hasura-User-Id
+          set: {}
+        role: user
+    - array_relationships: []
+      delete_permissions:
+      - comment: null
+        permission:
+          filter: {}
+        role: user
+      event_triggers: []
+      insert_permissions:
+      - comment: null
+        permission:
+          check: {}
+          columns:
+          - id
+          - received_at
+          - read_at
+          - user_id
+          - message_id
+          set: {}
+        role: user
+      object_relationships:
+      - comment: null
+        name: user
+        using:
+          foreign_key_constraint_on: user_id
+      - comment: null
+        name: message
+        using:
+          foreign_key_constraint_on: message_id
+      select_permissions:
+      - comment: null
+        permission:
+          allow_aggregations: false
+          columns:
+          - id
+          - message_id
+          - read_at
+          - received_at
+          - user_id
+          filter: {}
+        role: user
+      table: recipient
+      update_permissions:
+      - comment: null
+        permission:
+          columns:
+          - id
+          - message_id
+          - read_at
+          - received_at
+          - user_id
+          filter: {}
+          set: {}
+        role: user
+    - array_relationships:
+      - comment: null
+        name: recipients
+        using:
+          foreign_key_constraint_on:
+            column: message_id
+            table: recipient
+      delete_permissions:
+      - comment: null
+        permission:
+          filter:
+            _or:
+            - sender_id:
+                _eq: X-Hasura-User-Id
+        role: user
+      event_triggers: []
+      insert_permissions:
+      - comment: null
+        permission:
+          check:
+            _or:
+            - sender_id:
+                _eq: X-Hasura-User-Id
+          columns:
+          - id
+          - content
+          - created_at
+          - sender_id
+          - chat_id
+          set: {}
+        role: user
+      object_relationships:
+      - comment: null
+        name: chat
+        using:
+          foreign_key_constraint_on: chat_id
+      - comment: null
+        name: sender
+        using:
+          foreign_key_constraint_on: sender_id
+      select_permissions:
+      - comment: null
+        permission:
+          allow_aggregations: true
+          columns:
+          - chat_id
+          - content
+          - created_at
+          - id
+          - sender_id
+          filter:
+            _or:
+            - sender_id:
+                _eq: X-Hasura-User-Id
+            - chat:
+                users:
+                  user_id:
+                    _eq: X-Hasura-User-Id
+        role: user
+      table: message
+      update_permissions:
+      - comment: null
+        permission:
+          columns:
+          - chat_id
+          - content
+          - created_at
+          - id
+          - sender_id
+          filter:
+            _or:
+            - sender_id:
+                _eq: X-Hasura-User-Id
+          set: {}
+        role: user
--- a/community/sample-apps/whatsapp-clone-typescript-react/hasura/migrations/metadata.yaml
+++ b/community/sample-apps/whatsapp-clone-typescript-react/hasura/migrations/metadata.yaml
@ -0,0 +1,414 @@
+functions: []
+query_templates: []
+remote_schemas: []
+tables:
+- array_relationships: []
+  delete_permissions: []
+  event_triggers: []
+  insert_permissions: []
+  object_relationships:
+  - comment: null
+    name: chat
+    using:
+      manual_configuration:
+        column_mapping:
+          chat_id: id
+        remote_table: chat
+  - comment: null
+    name: sender
+    using:
+      manual_configuration:
+        column_mapping:
+          sender_id: id
+        remote_table: users
+  select_permissions:
+  - comment: null
+    permission:
+      allow_aggregations: true
+      columns:
+      - chat_id
+      - content
+      - created_at
+      - id
+      - sender_id
+      filter:
+        _or:
+        - sender_id:
+            _eq: X-Hasura-User-Id
+        - chat:
+            users:
+              user_id:
+                _eq: X-Hasura-User-Id
+      limit: 1
+    role: user
+  table: message_user
+  update_permissions: []
+- array_relationships: []
+  delete_permissions:
+  - comment: null
+    permission:
+      filter: {}
+    role: user
+  event_triggers: []
+  insert_permissions:
+  - comment: null
+    permission:
+      check: {}
+      columns:
+      - chat_id
+      - user_id
+      set: {}
+    role: user
+  object_relationships: []
+  select_permissions:
+  - comment: null
+    permission:
+      allow_aggregations: false
+      columns:
+      - chat_id
+      - user_id
+      filter: {}
+    role: user
+  table: chat_group_admins
+  update_permissions:
+  - comment: null
+    permission:
+      columns:
+      - chat_id
+      - user_id
+      filter: {}
+      set: {}
+    role: user
+- array_relationships:
+  - comment: null
+    name: users
+    using:
+      foreign_key_constraint_on:
+        column: chat_id
+        table: chat_users
+  - comment: null
+    name: messages
+    using:
+      foreign_key_constraint_on:
+        column: chat_id
+        table: message
+  delete_permissions:
+  - comment: null
+    permission:
+      filter:
+        _or:
+        - owner_id:
+            _eq: X-Hasura-User-Id
+        - users:
+            user_id:
+              _eq: X-Hasura-User-Id
+    role: user
+  event_triggers: []
+  insert_permissions:
+  - comment: null
+    permission:
+      check:
+        _or:
+        - owner_id:
+            _eq: X-Hasura-User-Id
+        - users:
+            user_id:
+              _eq: X-Hasura-User-Id
+        - owner_id:
+            _is_null: true
+      columns:
+      - created_at
+      - id
+      - name
+      - owner_id
+      - picture
+      set: {}
+    role: user
+  object_relationships:
+  - comment: null
+    name: owner
+    using:
+      foreign_key_constraint_on: owner_id
+  select_permissions:
+  - comment: null
+    permission:
+      allow_aggregations: true
+      columns:
+      - created_at
+      - id
+      - name
+      - owner_id
+      - picture
+      filter:
+        _or:
+        - owner_id:
+            _eq: X-Hasura-User-Id
+        - users:
+            user_id:
+              _eq: X-Hasura-User-Id
+    role: user
+  table: chat
+  update_permissions:
+  - comment: null
+    permission:
+      columns:
+      - created_at
+      - id
+      - name
+      - owner_id
+      - picture
+      filter:
+        _or:
+        - owner_id:
+            _eq: X-Hasura-User-Id
+        - users:
+            user_id:
+              _eq: X-Hasura-User-Id
+      set: {}
+    role: user
+- array_relationships: []
+  delete_permissions:
+  - comment: null
+    permission:
+      filter:
+        _or:
+        - user_id:
+            _eq: X-Hasura-User-Id
+        - chat:
+            users:
+              user_id:
+                _eq: X-Hasura-User-Id
+    role: user
+  event_triggers: []
+  insert_permissions:
+  - comment: null
+    permission:
+      check: {}
+      columns:
+      - chat_id
+      - user_id
+      set: {}
+    role: user
+  object_relationships:
+  - comment: null
+    name: chat
+    using:
+      foreign_key_constraint_on: chat_id
+  - comment: null
+    name: user
+    using:
+      foreign_key_constraint_on: user_id
+  select_permissions:
+  - comment: null
+    permission:
+      allow_aggregations: true
+      columns:
+      - chat_id
+      - user_id
+      filter:
+        _or:
+        - user_id:
+            _eq: X-Hasura-User-Id
+        - chat:
+            users:
+              user_id:
+                _eq: X-Hasura-User-Id
+    role: user
+  table: chat_users
+  update_permissions: []
+- array_relationships: []
+  delete_permissions:
+  - comment: null
+    permission:
+      filter:
+        id:
+          _eq: X-Hasura-User-Id
+    role: user
+  event_triggers: []
+  insert_permissions:
+  - comment: null
+    permission:
+      check:
+        id:
+          _eq: X-Hasura-User-Id
+      columns:
+      - created_at
+      - id
+      - name
+      - password
+      - picture
+      - username
+      set: {}
+    role: user
+  object_relationships: []
+  select_permissions:
+  - comment: null
+    permission:
+      allow_aggregations: false
+      columns:
+      - created_at
+      - id
+      - name
+      - password
+      - picture
+      - username
+      filter: {}
+    role: user
+  - comment: null
+    permission:
+      allow_aggregations: false
+      columns:
+      - created_at
+      - id
+      - name
+      - password
+      - picture
+      - username
+      filter:
+        id:
+          _eq: X-Hasura-User-Id
+    role: mine
+  table: users
+  update_permissions:
+  - comment: null
+    permission:
+      columns:
+      - created_at
+      - id
+      - name
+      - password
+      - picture
+      - username
+      filter:
+        id:
+          _eq: X-Hasura-User-Id
+      set: {}
+    role: user
+- array_relationships: []
+  delete_permissions:
+  - comment: null
+    permission:
+      filter: {}
+    role: user
+  event_triggers: []
+  insert_permissions:
+  - comment: null
+    permission:
+      check: {}
+      columns:
+      - id
+      - received_at
+      - read_at
+      - user_id
+      - message_id
+      set: {}
+    role: user
+  object_relationships:
+  - comment: null
+    name: user
+    using:
+      foreign_key_constraint_on: user_id
+  - comment: null
+    name: message
+    using:
+      foreign_key_constraint_on: message_id
+  select_permissions:
+  - comment: null
+    permission:
+      allow_aggregations: false
+      columns:
+      - id
+      - message_id
+      - read_at
+      - received_at
+      - user_id
+      filter: {}
+    role: user
+  table: recipient
+  update_permissions:
+  - comment: null
+    permission:
+      columns:
+      - id
+      - message_id
+      - read_at
+      - received_at
+      - user_id
+      filter: {}
+      set: {}
+    role: user
+- array_relationships:
+  - comment: null
+    name: recipients
+    using:
+      foreign_key_constraint_on:
+        column: message_id
+        table: recipient
+  delete_permissions:
+  - comment: null
+    permission:
+      filter:
+        _or:
+        - sender_id:
+            _eq: X-Hasura-User-Id
+    role: user
+  event_triggers: []
+  insert_permissions:
+  - comment: null
+    permission:
+      check:
+        _or:
+        - sender_id:
+            _eq: X-Hasura-User-Id
+      columns:
+      - id
+      - content
+      - created_at
+      - sender_id
+      - chat_id
+      set: {}
+    role: user
+  object_relationships:
+  - comment: null
+    name: chat
+    using:
+      foreign_key_constraint_on: chat_id
+  - comment: null
+    name: sender
+    using:
+      foreign_key_constraint_on: sender_id
+  select_permissions:
+  - comment: null
+    permission:
+      allow_aggregations: true
+      columns:
+      - chat_id
+      - content
+      - created_at
+      - id
+      - sender_id
+      filter:
+        _or:
+        - sender_id:
+            _eq: X-Hasura-User-Id
+        - chat:
+            users:
+              user_id:
+                _eq: X-Hasura-User-Id
+    role: user
+  table: message
+  update_permissions:
+  - comment: null
+    permission:
+      columns:
+      - chat_id
+      - content
+      - created_at
+      - id
+      - sender_id
+      filter:
+        _or:
+        - sender_id:
+            _eq: X-Hasura-User-Id
+      set: {}
+    role: user
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/.gitignore
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/.gitignore
@ -0,0 +1,3 @@
+node_modules
+npm-debug.log
+.env
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/LICENSE
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/LICENSE
@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2019 Uri Goldshtein
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/README.md
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/README.md
@ -0,0 +1,36 @@
+# WhatsApp Clone React Client
+
+### Run instructions
+
+Make sure to setup Hasura GraphQL Engine first.
+
+####Install Dependencies
+
+    yarn install
+
+Run codegen to generate TypeScript types
+
+    yarn generate
+
+**Note**: The types are generated from the server! So if you have `admin secret` enabled in your graphql-engine server, make sure to update the headers in `codegen.yml` file.
+
+Set environment variables. Open `.env` file and add the following env
+
+```bash
+REACT_APP_SERVER_URL='<graphql_engine_server_url'>
+REACT_APP_AUTH_URL='<auth_server_url'>
+REACT_APP_ENV='dev'
+```
+
+####Start the app
+
+```
+yarn start
+```
+
+Note that the auth server should run on port `8010`. If you decide to change that, be sure to edit the `.env` file in the auth server.
+
+### License
+
+MIT
+
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/codegen-interpreter.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/codegen-interpreter.ts
@ -0,0 +1,6 @@
+require('ts-node').register({
+  transpileOnly: true,
+  compilerOptions: {
+    module: 'commonjs'
+  }
+})
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/codegen.yml
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/codegen.yml
@ -0,0 +1,13 @@
+schema:
+  - http://localhost:8080/v1alpha1/graphql:
+      #headers:
+      #  x-hasura-admin-secret: 
+documents:
+  - ./src/**/*.tsx
+  - ./src/**/*.ts
+overwrite: true
+generates:
+  ./src/graphql/types.ts:
+    plugins:
+      - typescript-common
+      - typescript-client
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/now.json
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/now.json
@ -0,0 +1,10 @@
+{
+  "name":"whatsapp-clone",
+  "version": 1,
+  "env": {
+    "REACT_APP_SERVER_URL": "https://whatsapp-clone-hasura.herokuapp.com/v1alpha1/graphql",
+    "REACT_APP_AUTH_URL": "https://warm-hamlet-82072.herokuapp.com"
+  },
+  "public": true,
+  "alias": ["whatsapp-clone-hasura.now.sh"]
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/package.json
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/package.json
@ -0,0 +1,61 @@
+{
+  "name": "whatsapp-clone-client",
+  "version": "0.1.0",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://Urigo@github.com/Urigo/WhatsApp-Clone-Client-React.git"
+  },
+  "dependencies": {
+    "@material-ui/core": "3.9.2",
+    "@material-ui/icons": "3.0.2",
+    "@types/moment": "2.13.0",
+    "apollo-cache-inmemory": "1.4.3",
+    "apollo-client": "2.4.13",
+    "apollo-link": "1.2.8",
+    "apollo-link-context": "1.0.14",
+    "apollo-link-http": "1.5.11",
+    "apollo-link-ws": "1.0.14",
+    "apollo-utilities": "1.1.3",
+    "graphql": "14.1.1",
+    "graphql-tag": "2.10.1",
+    "moment": "2.24.0",
+    "react": "16.8.3",
+    "react-apollo-hooks": "0.4.1",
+    "react-dom": "16.8.3",
+    "react-fast-compare": "2.0.4",
+    "react-router-dom": "4.3.1",
+    "react-router-transition": "1.2.1",
+    "react-scripts": "2.1.5",
+    "styled-components": "4.1.3",
+    "subscriptions-transport-ws": "0.9.15",
+    "uniqid": "5.0.3"
+  },
+  "devDependencies": {
+    "@types/graphql": "14.0.7",
+    "@types/node": "11.9.5",
+    "concurrently": "4.1.0",
+    "graphql-code-generator": "0.18.0",
+    "graphql-codegen-typescript-client": "0.18.0",
+    "graphql-codegen-typescript-common": "0.18.0",
+    "nodemon": "1.18.10",
+    "ts-node": "^8.0.2"
+  },
+  "scripts": {
+    "start": "concurrently \"yarn generate:watch\" \"react-scripts start\"",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject",
+    "generate": "gql-gen",
+    "generate:watch": "nodemon --exec yarn generate -e graphql"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": [
+    ">0.2%",
+    "not dead",
+    "not ie <= 11",
+    "not op_mini all"
+  ]
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/assets/chat-background.jpg
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/assets/chat-background.jpg
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/assets/default-group-pic.jpg
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/assets/default-group-pic.jpg
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/assets/default-profile-pic.jpg
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/assets/default-profile-pic.jpg
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/assets/whatsapp-icon.png
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/assets/whatsapp-icon.png
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/favicon.ico
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/favicon.ico
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/index.html
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/index.html
@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta
+      name="viewport"
+      content="width=device-width, initial-scale=1, shrink-to-fit=no"
+    />
+    <meta name="theme-color" content="#000000" />
+    <!--
+      manifest.json provides metadata used when your web app is added to the
+      homescreen on Android. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>WhatsApp Clone</title>
+    <!-- Global site tag (gtag.js) - Google Analytics -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-129818961-1"></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+
+      gtag('config', 'UA-129818961-1');
+    </script>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/manifest.json
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/public/manifest.json
@ -0,0 +1,15 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/renovate.json
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/renovate.json
@ -0,0 +1,14 @@
+{
+  "extends": [
+    "config:base",
+    ":automergeMajor"
+  ],
+  "baseBranches": [
+    "master-step1",
+    "master-step2",
+    "master-step3",
+    "master-step4"
+  ],
+  "prHourlyLimit": 60,
+  "recreateClosed": true
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/App.css
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/App.css
@ -0,0 +1,32 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  animation: App-logo-spin infinite 20s linear;
+  height: 40vmin;
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/App.test.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/App.test.tsx
@ -0,0 +1,9 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+
+it('renders without crashing', () => {
+  const div = document.createElement('div');
+  ReactDOM.render(<App />, div);
+  ReactDOM.unmountComponentAtNode(div);
+});
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/App.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/App.tsx
@ -0,0 +1,31 @@
+import * as React from 'react'
+import { BrowserRouter, Route, Redirect } from 'react-router-dom'
+import ChatRoomScreen from './components/ChatRoomScreen'
+import NewChatScreen from './components/NewChatScreen'
+import AnimatedSwitch from './components/AnimatedSwitch'
+import AuthScreen from './components/AuthScreen'
+import ChatsListScreen from './components/ChatsListScreen'
+import GroupDetailsScreen from './components/GroupDetailsScreen'
+import SettingsScreen from './components/SettingsScreen'
+import NewGroupScreen from './components/NewGroupScreen'
+import { withAuth } from './services/auth.service'
+
+const RedirectToChats = () => (
+  <Redirect to="/chats" />
+)
+
+export default () => (
+  <BrowserRouter>
+    <AnimatedSwitch>
+      <Route exact path="/sign-(in|up)" component={AuthScreen} />
+      <Route exact path="/chats" component={withAuth(ChatsListScreen)} />
+      <Route exact path="/settings" component={withAuth(SettingsScreen)} />
+      <Route exact path="/chats/:chatId" component={withAuth(ChatRoomScreen)} />
+      <Route exact path="/new-chat" component={withAuth(NewChatScreen)} />
+      <Route exact path="/new-chat/group" component={withAuth(NewGroupScreen)} />
+      <Route exact path="/new-chat/group/details" component={withAuth(GroupDetailsScreen)} />
+      <Route exact path="/chats/:chatId/details" component={withAuth(GroupDetailsScreen)} />
+      <Route component={RedirectToChats} />
+    </AnimatedSwitch>
+  </BrowserRouter>
+)
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/apollo-client.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/apollo-client.ts
@ -0,0 +1,55 @@
+import { InMemoryCache } from 'apollo-cache-inmemory'
+import { ApolloClient } from 'apollo-client'
+import { ApolloLink, split } from 'apollo-link'
+import { setContext } from 'apollo-link-context'
+import { HttpLink } from 'apollo-link-http'
+import { WebSocketLink } from 'apollo-link-ws'
+import { getMainDefinition } from 'apollo-utilities'
+import { OperationDefinitionNode } from 'graphql'
+import { getAuthHeader } from './services/auth.service'
+
+const httpUri = process.env.REACT_APP_SERVER_URL
+const wsUri = httpUri.replace(/^https?/, process.env.REACT_APP_ENV === 'dev' ? 'ws' : 'wss')
+
+const httpLink = new HttpLink({
+  uri: httpUri,
+})
+
+const wsLink = new WebSocketLink({
+  uri: wsUri,
+  options: {
+    lazy: true,
+    reconnect: true,
+    connectionParams: () => {
+      return { headers: {'Authorization': getAuthHeader()} };
+    },
+  },
+})
+
+const authLink = setContext((_, { headers }) => {
+  const auth = getAuthHeader()
+
+  return {
+    headers: {
+      ...headers,
+      Authorization: auth,
+    },
+  }
+})
+
+const terminatingLink = split(
+  ({ query }) => {
+    const { kind, operation } = getMainDefinition(query) as OperationDefinitionNode
+    return kind === 'OperationDefinition' && operation === 'subscription'
+  },
+  wsLink,
+  authLink.concat(httpLink),
+)
+
+const link = ApolloLink.from([terminatingLink])
+const cache = new InMemoryCache()
+
+export default new ApolloClient({
+  link,
+  cache,
+})
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/AnimatedSwitch.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/AnimatedSwitch.tsx
@ -0,0 +1,30 @@
+import styled from 'styled-components'
+import { AnimatedSwitch, spring } from 'react-router-transition'
+
+const glide = val =>
+  spring(val, {
+    stiffness: 174,
+    damping: 24,
+  })
+
+const mapStyles = styles => ({
+  transform: `translateX(${styles.offset}%)`,
+})
+
+export default styled(AnimatedSwitch).attrs(() => ({
+  atEnter: { offset: 100 },
+  atLeave: { offset: glide(-100) },
+  atActive: { offset: glide(0) },
+  mapStyles,
+}))`
+  position: relative;
+  overflow: hidden;
+  width: 100%;
+  height: 100%;
+  > div {
+    position: absolute;
+    overflow: hidden;
+    width: 100%;
+    height: 100%;
+  }
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/AuthScreen/SignInForm.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/AuthScreen/SignInForm.tsx
@ -0,0 +1,84 @@
+import Button from '@material-ui/core/Button'
+import TextField from '@material-ui/core/TextField'
+import { History } from 'history'
+import * as React from 'react'
+import { useState } from 'react'
+import { signIn } from '../../services/auth.service'
+
+interface SignInFormProps {
+  history: History
+}
+
+export default ({ history }: SignInFormProps) => {
+  const [username, setUsername] = useState('')
+  const [password, setPassword] = useState('')
+  const [error, setError] = useState('')
+
+  const onUsernameChange = ({ target }) => {
+    setError('')
+    setUsername(target.value)
+  }
+
+  const onPasswordChange = ({ target }) => {
+    setError('')
+    setPassword(target.value)
+  }
+
+  const maySignIn = () => {
+    return !!(username && password)
+  }
+
+  const handleSignIn = () => {
+    signIn({ username, password })
+      .then(() => {
+        history.push('/chats')
+      })
+      .catch(error => {
+        setError(error.message || error)
+      })
+  }
+
+  const handleSignUp = () => {
+    history.push('/sign-up')
+  }
+
+  return (
+    <div className="SignInForm Screen">
+      <form>
+        <legend>Sign in</legend>
+        <div style={{ width: '100%' }}>
+          <TextField
+            className="AuthScreen-text-field"
+            label="Username"
+            value={username}
+            onChange={onUsernameChange}
+            margin="normal"
+            placeholder="Enter your username"
+          />
+          <TextField
+            className="AuthScreen-text-field"
+            label="Password"
+            type="password"
+            value={password}
+            onChange={onPasswordChange}
+            margin="normal"
+            placeholder="Enter your password"
+          />
+        </div>
+        <Button
+          type="button"
+          color="secondary"
+          variant="contained"
+          disabled={!maySignIn()}
+          onClick={handleSignIn}
+        >
+          Sign in
+        </Button>
+        <div className="AuthScreen-error">{error}</div>
+        <span className="AuthScreen-alternative">
+          Don't have an account yet? <a onClick={handleSignUp}>Sign up!</a>
+        </span>
+      </form>
+    </div>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/AuthScreen/SignUpForm.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/AuthScreen/SignUpForm.tsx
@ -0,0 +1,131 @@
+import Button from '@material-ui/core/Button'
+import TextField from '@material-ui/core/TextField'
+import { History } from 'history'
+import * as React from 'react'
+import { useState } from 'react'
+import { signUp } from '../../services/auth.service'
+
+interface SignUpFormProps {
+  history: History
+}
+
+export default ({ history }: SignUpFormProps) => {
+  const [name, setName] = useState('')
+  const [username, setUsername] = useState('')
+  const [oldPassword, setOldPassword] = useState('')
+  const [password, setPassword] = useState('')
+  const [error, setError] = useState('')
+
+  const updateName = ({ target }) => {
+    setError('')
+    setName(target.value)
+  }
+
+  const updateUsername = ({ target }) => {
+    setError('')
+    setUsername(target.value)
+  }
+
+  const updateOldPassword = ({ target }) => {
+    setError('')
+    setOldPassword(target.value)
+  }
+
+  const updateNewPassword = ({ target }) => {
+    setError('')
+    setPassword(target.value)
+  }
+
+  const maySignUp = () => {
+    return !!(name && username && oldPassword && oldPassword === password)
+  }
+
+  const handleSignUp = () => {
+    signUp({ username, password, name })
+      .then((response) => {
+        if(response.ok) {
+          history.push('/sign-in')
+        } else {
+          alert('Could not signup now. Try again later');
+        }
+      })
+      .catch(error => {
+        setError(error.message || error)
+      })
+  }
+
+  const handleSignIn = () => {
+    history.push('/sign-in')
+  }
+
+  return (
+    <div className="SignUpForm Screen">
+      <form>
+        <legend>Sign up</legend>
+        <div
+          style={{
+            float: 'left',
+            width: 'calc(50% - 10px)',
+            paddingRight: '10px',
+          }}
+        >
+          <TextField
+            className="AuthScreen-text-field"
+            label="Name"
+            value={name}
+            onChange={updateName}
+            autoComplete="off"
+            margin="normal"
+          />
+          <TextField
+            className="AuthScreen-text-field"
+            label="Username"
+            value={username}
+            onChange={updateUsername}
+            autoComplete="off"
+            margin="normal"
+          />
+        </div>
+        <div
+          style={{
+            float: 'right',
+            width: 'calc(50% - 10px)',
+            paddingLeft: '10px',
+          }}
+        >
+          <TextField
+            className="AuthScreen-text-field"
+            label="Enter password"
+            type="password"
+            value={oldPassword}
+            onChange={updateOldPassword}
+            autoComplete="off"
+            margin="normal"
+          />
+          <TextField
+            className="AuthScreen-text-field"
+            label="Confirm password"
+            type="password"
+            value={password}
+            onChange={updateNewPassword}
+            autoComplete="off"
+            margin="normal"
+          />
+        </div>
+        <Button
+          type="button"
+          color="secondary"
+          variant="contained"
+          disabled={!maySignUp()}
+          onClick={handleSignUp}
+        >
+          Sign up
+        </Button>
+        <div className="AuthScreen-error">{error}</div>
+        <span className="AuthScreen-alternative">
+          Already have an accout? <a onClick={handleSignIn}>Sign in!</a>
+        </span>
+      </form>
+    </div>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/AuthScreen/index.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/AuthScreen/index.tsx
@ -0,0 +1,118 @@
+import * as React from 'react'
+import { RouteComponentProps } from 'react-router-dom'
+import { Route } from 'react-router-dom'
+import styled from 'styled-components'
+import AnimatedSwitch from '../AnimatedSwitch'
+import SignInForm from './SignInForm'
+import SignUpForm from './SignUpForm'
+
+const Style = styled.div`
+  background: radial-gradient(rgb(34, 65, 67), rgb(17, 48, 50)),
+    url(/assets/chat-background.jpg) no-repeat;
+  background-size: cover;
+  background-blend-mode: multiply;
+  color: white;
+
+  .AuthScreen-intro {
+    height: 265px;
+  }
+
+  .AuthScreen-icon {
+    width: 125px;
+    height: auto;
+    margin-left: auto;
+    margin-right: auto;
+    padding-top: 70px;
+    display: block;
+  }
+
+  .AuthScreen-title {
+    width: 100%;
+    text-align: center;
+    color: white;
+  }
+
+  .AuthScreen-text-field {
+    width: 100%;
+    position: relative;
+  }
+
+  .AuthScreen-text-field > div::before {
+    border-color: white !important;
+  }
+
+  .AuthScreen-error {
+    position: absolute;
+    color: red;
+    font-size: 15px;
+    margin-top: 20px;
+  }
+
+  .AuthScreen-alternative {
+    position: absolute;
+    bottom: 10px;
+    left: 10px;
+
+    a {
+      color: var(--secondary-bg);
+    }
+  }
+
+  .Screen {
+    height: calc(100% - 265px);
+  }
+
+  form {
+    padding: 20px;
+
+    > div {
+      padding-bottom: 35px;
+    }
+  }
+
+  legend {
+    font-weight: bold;
+    color: white;
+  }
+
+  label {
+    color: white !important;
+  }
+
+  input {
+    color: white;
+
+    &::placeholder {
+      color: var(--primary-bg);
+    }
+  }
+
+  button {
+    width: 100px;
+    display: block;
+    margin-left: auto;
+    margin-right: auto;
+    background-color: var(--secondary-bg) !important;
+
+    &[disabled] {
+      color: #38a81c;
+    }
+
+    &:not([disabled]) {
+      color: white;
+    }
+  }
+`
+
+export default ({ history, location }: RouteComponentProps) => (
+  <Style className="AuthScreen Screen">
+    <div className="AuthScreen-intro">
+      <img src="assets/whatsapp-icon.png" className="AuthScreen-icon" />
+      <h2 className="AuthScreen-title">WhatsApp Clone</h2>
+    </div>
+    <AnimatedSwitch>
+      <Route exact path="/sign-in" component={SignInForm} />
+      <Route exact path="/sign-up" component={SignUpForm} />
+    </AnimatedSwitch>
+  </Style>
+)
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatRoomScreen/ChatNavbar.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatRoomScreen/ChatNavbar.tsx
@ -0,0 +1,214 @@
+import Button from '@material-ui/core/Button'
+import List from '@material-ui/core/List'
+import ListItem from '@material-ui/core/ListItem'
+import Popover from '@material-ui/core/Popover'
+import ArrowBackIcon from '@material-ui/icons/ArrowBack'
+import DeleteIcon from '@material-ui/icons/Delete'
+import InfoIcon from '@material-ui/icons/Info'
+import MoreIcon from '@material-ui/icons/MoreVert'
+import gql from 'graphql-tag'
+import { History } from 'history'
+import * as React from 'react'
+import { useState } from 'react'
+import { useQuery, useMutation } from 'react-apollo-hooks'
+import styled from 'styled-components'
+import * as fragments from '../../graphql/fragments'
+import * as queries from '../../graphql/queries'
+import { useMe } from '../../services/auth.service';
+import { ChatList, DeleteChat, ChatsListQueryCache } from '../../graphql/types'
+
+const Style = styled.div`
+  padding: 0;
+  display: flex;
+  flex-direction: row;
+
+  margin-left: -20px;
+  .ChatNavbar-title {
+    line-height: 56px;
+  }
+
+  .ChatNavbar-back-button {
+    color: var(--primary-text);
+  }
+
+  .ChatNavbar-picture {
+    height: 40px;
+    width: 40px;
+    margin-top: 3px;
+    margin-left: -22px;
+    object-fit: cover;
+    padding: 5px;
+    border-radius: 50%;
+  }
+
+  .ChatNavbar-rest {
+    flex: 1;
+    justify-content: flex-end;
+  }
+
+  .ChatNavbar-options-btn {
+    float: right;
+    height: 100%;
+    font-size: 1.2em;
+    margin-right: -15px;
+    color: var(--primary-text);
+  }
+
+  .ChatNavbar-options-item svg {
+    margin-right: 10px;
+    padding-left: 15px;
+  }
+`
+
+const query = gql`
+  query ChatList($chatId: Int!, $userId: Int!) {
+    chat_users(where:{chat_id: {_eq: $chatId}, user_id: {_neq: $userId}}) {
+      chat {
+        ...chat
+      }
+      user {
+        ...user
+      }
+    }
+  }
+  ${fragments.chat}
+  ${fragments.user}
+`
+
+const queryCache = gql`
+  query ChatsListQueryCache($userId: Int!) {
+    chat(order_by:[{messages_aggregate:{max:{created_at:desc}}}]) {
+      ...chat
+      users(where:{user_id:{_neq:$userId}}) {
+        user {
+          ...user
+        }
+      }
+    }
+  }
+  ${fragments.chat}
+  ${fragments.user}
+`;
+
+const mutation = gql`
+  mutation deleteChat($chatId: Int!) {
+    delete_chat_users(where:{chat_id:{_eq: $chatId}}) {
+      affected_rows
+    }
+    delete_message(where:{chat_id:{_eq: $chatId}}) {
+      affected_rows
+    }
+    delete_chat(where:{id: {_eq: $chatId}}) {
+      affected_rows
+    }
+  }
+`
+
+interface ChatNavbarProps {
+  chatId: string
+  history: History
+}
+
+export default ({ chatId, history }: ChatNavbarProps) => {
+  const me = useMe();
+  const parsedChatId = parseInt(chatId,10)
+  const {
+    data: { chat_users },
+  } = useQuery<ChatList.Query, ChatList.Variables>(query, {
+    variables: { chatId: parsedChatId, userId: me.id },
+    suspend: true,
+  })
+  const removeChat = useMutation<DeleteChat.Mutation, DeleteChat.Variables>(
+    mutation,
+    {
+      variables: { chatId: parsedChatId },
+      update: (client, { data: { delete_chat } }) => {
+        let chats
+        try {
+          chats = client.readQuery<ChatsListQueryCache.Query, ChatsListQueryCache.Variables>({
+            query: queryCache,
+            variables: {userId: me.id}
+          }).chat
+        } catch(e) {
+          console.error(e)
+        }
+        if (chats) {
+          // filter current parsedChatId
+          chats = chats.filter((chat) => chat.id !== parsedChatId);
+          try {
+            client.writeQuery<ChatsListQueryCache.Query, ChatsListQueryCache.Variables>({
+              query: queryCache,
+              variables: {userId: me.id},
+              data: { chat: chats },
+            })
+          } catch(e) {
+            console.error(e)
+          }
+        }
+      },
+    },
+  )
+  const [popped, setPopped] = useState(false)
+
+  const navToChats = () => {
+    history.push('/chats')
+  }
+
+  const navToGroupDetails = () => {
+    setPopped(false)
+    history.push(`/chats/${chatId}/details`, { chat_users })
+  }
+
+  const handleRemoveChat = () => {
+    setPopped(false)
+    removeChat().then(navToChats)
+  }
+  let picture = chat_users[0].chat.owner_id ? chat_users[0].chat.picture : chat_users[0].user.picture;
+  if(!picture) {
+    picture = chat_users[0].chat.owner_id ? '/assets/default-group-pic.jpg' : '/assets/default-profile-pic.jpg';
+  }
+  return (
+    <Style className={name}>
+      <Button className="ChatNavbar-back-button" onClick={navToChats}>
+        <ArrowBackIcon />
+      </Button>
+      <img
+        className="ChatNavbar-picture"
+        src={picture}
+      />
+      <div className="ChatNavbar-title">{chat_users[0].chat.owner_id ? chat_users[0].chat.name : chat_users[0].user.username}</div>
+      <div className="ChatNavbar-rest">
+        <Button className="ChatNavbar-options-btn" onClick={setPopped.bind(null, true)}>
+          <MoreIcon />
+        </Button>
+      </div>
+      <Popover
+        open={popped}
+        onClose={setPopped.bind(null, false)}
+        anchorOrigin={{
+          vertical: 'top',
+          horizontal: 'right',
+        }}
+        transformOrigin={{
+          vertical: 'top',
+          horizontal: 'right',
+        }}
+      >
+        <Style style={{ marginLeft: '-15px' }}>
+          <List>
+            {chat_users[0].chat.owner_id && (
+              <ListItem className="ChatNavbar-options-item" button onClick={navToGroupDetails}>
+                <InfoIcon />
+                Details
+              </ListItem>
+            )}
+            <ListItem className="ChatNavbar-options-item" button onClick={handleRemoveChat}>
+              <DeleteIcon />
+              Delete
+            </ListItem>
+          </List>
+        </Style>
+      </Popover>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatRoomScreen/MessageBox.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatRoomScreen/MessageBox.tsx
@ -0,0 +1,165 @@
+import Button from '@material-ui/core/Button'
+import SendIcon from '@material-ui/icons/Send'
+import gql from 'graphql-tag'
+import * as React from 'react'
+import { useState } from 'react'
+import { useMutation } from 'react-apollo-hooks'
+import styled from 'styled-components'
+import { time as uniqid } from 'uniqid'
+import * as fragments from '../../graphql/fragments'
+import { MessageBoxMutation, MessagesListQueryLocal } from '../../graphql/types'
+import { useMe } from '../../services/auth.service'
+
+const Style = styled.div`
+  display: flex;
+  height: 50px;
+  padding: 5px;
+  width: calc(100% - 10px);
+
+  .MessageBox-input {
+    width: calc(100% - 50px);
+    border: none;
+    border-radius: 999px;
+    padding: 10px;
+    padding-left: 20px;
+    padding-right: 20px;
+    font-size: 15px;
+    outline: none;
+    box-shadow: 0 1px silver;
+    font-size: 18px;
+    line-height: 45px;
+  }
+
+  .MessageBox-button {
+    min-width: 50px;
+    width: 50px;
+    border-radius: 999px;
+    background-color: var(--primary-bg);
+    margin: 0 5px;
+    margin-right: 0;
+    color: white;
+    padding-left: 20px;
+    svg {
+      margin-left: -3px;
+    }
+  }
+`
+
+const mutation = gql`
+  mutation MessageBoxMutation($chatId: Int!, $content: String!, $sender_id: Int!) {
+    insert_message(objects: [{chat_id: $chatId, content: $content, sender_id: $sender_id}]) {
+      affected_rows
+      returning {
+        id
+        content
+        created_at
+        sender_id
+        chat_id
+        chat {
+          id
+        }
+        sender {
+          id
+          name
+        }
+        recipients {
+          user {
+            id
+          }
+          message {
+            id
+            chat {
+              id
+            }
+          }
+          received_at
+          read_at
+        }
+      }
+    }
+  }
+`
+interface MessageBoxProps {
+  chatId: string
+}
+
+export default ({ chatId }: MessageBoxProps) => {
+  const [message, setMessage] = useState('')
+  const me = useMe()
+  const senderId = me.id;
+
+  const addMessage = useMutation<MessageBoxMutation.Mutation, MessageBoxMutation.Variables>(
+    mutation,
+    {
+      variables: {
+        chatId: parseInt(chatId,10),
+        content: message,
+        sender_id: senderId
+      },
+      update: (client, { data: { insert_message } }) => {
+        const chatQuery = gql`
+          query MessagesListQueryLocal($chatId: Int!) {
+            chat(where:{id: {_eq: $chatId}}) {
+              ...chat
+            }
+          }
+          ${fragments.chat}
+        `
+
+        let chatData
+        try {
+          chatData = client.readQuery<MessagesListQueryLocal.Query, MessagesListQueryLocal.Variables>(
+            {query: chatQuery, variables: {chatId: parseInt(chatId,10)}})
+        } catch(e) {
+          console.error(e);
+        }
+        const finalChatData = {...chatData};
+        finalChatData.chat[0].messages.push(insert_message.returning[0]);
+        try {
+          client.writeQuery<MessagesListQueryLocal.Query, MessagesListQueryLocal.Variables>(
+            {query: chatQuery, variables: {chatId: parseInt(chatId,10)}, data: finalChatData})
+        } catch(e) {
+          console.error(e);
+        }
+      },
+    },
+  )
+
+  const onKeyPress = e => {
+    if (e.charCode === 13) {
+      submitMessage()
+    }
+  }
+
+  const onChange = ({ target }) => {
+    setMessage(target.value)
+  }
+
+  const submitMessage = () => {
+    if (!message) return
+
+    addMessage()
+    setMessage('')
+  }
+
+  return (
+    <Style className="MessageBox">
+      <input
+        className="MessageBox-input"
+        type="text"
+        placeholder="Type a message"
+        value={message}
+        onKeyPress={onKeyPress}
+        onChange={onChange}
+      />
+      <Button
+        variant="contained"
+        color="primary"
+        className="MessageBox-button"
+        onClick={submitMessage}
+      >
+        <SendIcon />
+      </Button>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatRoomScreen/MessagesList.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatRoomScreen/MessagesList.tsx
@ -0,0 +1,149 @@
+import gql from 'graphql-tag'
+import * as moment from 'moment'
+import * as React from 'react'
+import { useRef, useEffect } from 'react'
+import { useQuery, useMutation } from 'react-apollo-hooks'
+import * as ReactDOM from 'react-dom'
+import styled from 'styled-components'
+import * as fragments from '../../graphql/fragments'
+import { useMe } from '../../services/auth.service'
+import { MessagesListQuery } from '../../graphql/types'
+
+const Style = styled.div`
+  display: block;
+  height: calc(100% - 60px);
+  width: calc(100% - 30px);
+  overflow-y: overlay;
+  padding: 0 15px;
+
+  .MessagesList-message {
+    display: inline-block;
+    position: relative;
+    max-width: 100%;
+    border-radius: 7px;
+    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
+    margin-top: 10px;
+    margin-bottom: 10px;
+    clear: both;
+
+    &::after {
+      content: '';
+      display: table;
+      clear: both;
+    }
+  }
+
+  .MessagesList-message-mine {
+    float: right;
+    background-color: #dcf8c6;
+
+    &::before {
+      right: -11px;
+      background-image: url(/assets/message-mine.png);
+    }
+  }
+
+  .MessagesList-message-others {
+    float: left;
+    background-color: #fff;
+
+    &::before {
+      left: -11px;
+      background-image: url(/assets/message-other.png);
+    }
+  }
+
+  .MessagesList-message-others::before,
+  .MessagesList-message-mine::before {
+    content: '';
+    position: absolute;
+    bottom: 3px;
+    width: 12px;
+    height: 19px;
+    background-position: 50% 50%;
+    background-repeat: no-repeat;
+    background-size: contain;
+  }
+
+  .MessagesList-message-sender {
+    font-weight: bold;
+    margin-left: 5px;
+    margin-top: 5px;
+  }
+
+  .MessagesList-message-contents {
+    padding: 5px 7px;
+    word-wrap: break-word;
+
+    &::after {
+      content: ' \00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0';
+      display: inline;
+    }
+  }
+
+  .MessagesList-message-timestamp {
+    position: absolute;
+    bottom: 2px;
+    right: 7px;
+    color: gray;
+    font-size: 12px;
+  }
+`
+
+const query = gql`
+  query MessagesListQuery($chatId: Int!) {
+    chat(where:{id: {_eq: $chatId}}) {
+      ...chat
+    }
+  }
+  ${fragments.chat}
+`
+
+interface MessagesListProps {
+  chatId: string
+}
+
+export default ({ chatId }: MessagesListProps) => {
+  const me = useMe();
+  const {
+    data
+  } = useQuery<MessagesListQuery.Query, MessagesListQuery.Variables>(query, {
+    variables: { chatId: parseInt(chatId,10) },
+    suspend: true,
+  })
+  const messages = data.chat[0].messages;
+  const owner_id = data.chat[0].owner_id;
+  const selfRef = useRef(null)
+
+  const resetScrollTop = () => {
+    if (!selfRef.current) return
+
+    const selfDOMNode = ReactDOM.findDOMNode(selfRef.current) as HTMLElement
+    selfDOMNode.scrollTop = Number.MAX_SAFE_INTEGER
+  }
+
+  useEffect(resetScrollTop, [selfRef.current])
+  useEffect(resetScrollTop, [messages.length])
+
+  return (
+    <Style className={name} ref={selfRef}>
+      {messages &&
+        messages.map(message => (
+          <div
+            key={message.id+message.created_at}
+            className={`MessagesList-message ${
+              message.sender.id === me.id ? 'MessagesList-message-mine' : 'MessagesList-message-others'
+            }`}
+          >
+            {owner_id && (
+              <div className="MessagesList-message-sender">{message.sender.name}</div>
+            )}
+            <div className="MessagesList-message-contents">{message.content}</div>
+            <span className="MessagesList-message-timestamp">
+              {moment(message.created_at).format('HH:mm')}
+            </span>
+          </div>
+        ))}
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatRoomScreen/index.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatRoomScreen/index.tsx
@ -0,0 +1,56 @@
+import * as React from 'react'
+import { Suspense } from 'react'
+import { RouteComponentProps } from 'react-router-dom'
+import styled from 'styled-components'
+import Navbar from '../Navbar'
+import ChatNavbar from './ChatNavbar'
+import MessageBox from './MessageBox'
+import MessagesList from './MessagesList'
+
+const Style = styled.div`
+  .ChatScreen-body {
+    position: relative;
+    background: url(/assets/chat-background.jpg);
+    width: 100%;
+    height: calc(100% - 56px);
+
+    .MessagesList {
+      position: absolute;
+      height: calc(100% - 60px);
+      top: 0;
+    }
+
+    .MessageBox {
+      position: absolute;
+      bottom: 0;
+      left: 0;
+    }
+
+    .AddChatButton {
+      right: 0;
+      bottom: 0;
+    }
+  }
+`
+
+export default ({ match, history }: RouteComponentProps) => {
+  const chatId = match.params.chatId
+
+  return (
+    <Style className="ChatScreen Screen">
+      <Navbar>
+        <Suspense fallback={null}>
+          <ChatNavbar chatId={chatId} history={history} />
+        </Suspense>
+      </Navbar>
+      <div className="ChatScreen-body">
+        <Suspense fallback={null}>
+          <MessagesList chatId={chatId} />
+        </Suspense>
+        <Suspense fallback={null}>
+          <MessageBox chatId={chatId} />
+        </Suspense>
+      </div>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatsListScreen/AddChatButton.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatsListScreen/AddChatButton.tsx
@ -0,0 +1,38 @@
+import Button from '@material-ui/core/Button'
+import ChatIcon from '@material-ui/icons/Chat'
+import { History } from 'history'
+import * as React from 'react'
+import styled from 'styled-components'
+
+const Style = styled.div`
+  position: fixed;
+  right: 10px;
+  bottom: 10px;
+
+  button {
+    min-width: 50px;
+    width: 50px;
+    height: 50px;
+    border-radius: 999px;
+    background-color: var(--secondary-bg);
+    color: white;
+  }
+`
+
+interface AddChatButtonProps {
+  history: History
+}
+
+export default ({ history }: AddChatButtonProps) => {
+  const onClick = () => {
+    history.push('/new-chat')
+  }
+
+  return (
+    <Style className="AddChatButton">
+      <Button variant="contained" color="secondary" onClick={onClick}>
+        <ChatIcon />
+      </Button>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatsListScreen/ChatsList.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatsListScreen/ChatsList.tsx
@ -0,0 +1,132 @@
+import List from '@material-ui/core/List'
+import ListItem from '@material-ui/core/ListItem'
+import gql from 'graphql-tag'
+import { History } from 'history'
+import * as moment from 'moment'
+import * as React from 'react'
+import { useQuery } from 'react-apollo-hooks'
+import * as ReactDOM from 'react-dom'
+import styled from 'styled-components'
+import * as fragments from '../../graphql/fragments'
+import { ChatsListQuery } from '../../graphql/types'
+import { useMe } from '../../services/auth.service';
+
+const Style = styled.div`
+  height: calc(100% - 56px);
+  overflow-y: overlay;
+
+  .ChatsList-chats-list {
+    padding: 0;
+  }
+
+  .ChatsList-chat-item {
+    height: 76px;
+    padding: 0 15px;
+    display: flex;
+  }
+
+  .ChatsList-profile-pic {
+    height: 50px;
+    width: 50px;
+    object-fit: cover;
+    border-radius: 50%;
+  }
+
+  .ChatsList-info {
+    width: calc(100% - 60px);
+    height: calc(100% - 30px);
+    padding: 15px 0;
+    margin-left: 10px;
+    border-bottom: 0.5px solid silver;
+    position: relative;
+  }
+
+  .ChatsList-name {
+    margin-top: 5px;
+  }
+
+  .ChatsList-last-message {
+    color: gray;
+    font-size: 15px;
+    margin-top: 5px;
+    text-overflow: ellipsis;
+    overflow: hidden;
+    white-space: nowrap;
+  }
+
+  .ChatsList-timestamp {
+    position: absolute;
+    color: gray;
+    top: 20px;
+    right: 0;
+    font-size: 13px;
+  }
+`
+
+// user_id not equal to currently logged in user
+const query = gql`
+  query ChatsListQuery($userId: Int!) {
+    chat(order_by:[{messages_aggregate:{max:{created_at:desc}}}]) {
+      ...chat
+      users(where:{user_id:{_neq:$userId}}) {
+        user {
+          ...user
+        }
+      }
+    }
+  }
+  ${fragments.chat}
+  ${fragments.user}
+`
+
+interface ChatsListProps {
+  history: History
+}
+
+export default ({ history }: ChatsListProps) => {
+  const me = useMe();
+  const {
+    data: { chat },
+  } = useQuery<ChatsListQuery.Query, ChatsListQuery.Variables>(query, { variables: {userId: me.id}, suspend: true })
+
+  const navToChat = chatId => {
+    history.push(`chats/${chatId}`)
+  }
+  return (
+    <Style className="ChatsList">
+      <List className="ChatsList-chats-list">
+        {chat.map(chat => {
+          return (
+            <ListItem
+              key={chat.id}
+              className="ChatsList-chat-item"
+              button
+              onClick={navToChat.bind(null, chat.id)}
+            >
+              <img
+                className="ChatsList-profile-pic"
+                src={
+                  chat.users[0].user.picture ||
+                  (chat.owner_id
+                    ? '/assets/default-group-pic.jpg'
+                    : '/assets/default-profile-pic.jpg')
+                }
+              />
+              <div className="ChatsList-info">
+                <div className="ChatsList-name">{chat.owner_id ? chat.name : chat.users[0].user.username}</div>
+                {chat.messages && chat.messages[chat.messages.length-1] && (
+                  <React.Fragment>
+                    <div className="ChatsList-last-message">{chat.messages[chat.messages.length-1].content}</div>
+                    <div className="ChatsList-timestamp">
+                      {moment(chat.messages[chat.messages.length-1].created_at).format('HH:mm')}
+                    </div>
+                  </React.Fragment>
+                )}
+              </div>
+            </ListItem>
+          );
+        })}
+      </List>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatsListScreen/ChatsNavbar.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatsListScreen/ChatsNavbar.tsx
@ -0,0 +1,95 @@
+import Button from '@material-ui/core/Button'
+import List from '@material-ui/core/List'
+import ListItem from '@material-ui/core/ListItem'
+import Popover from '@material-ui/core/Popover'
+import MoreIcon from '@material-ui/icons/MoreVert'
+import SignOutIcon from '@material-ui/icons/PowerSettingsNew'
+import SettingsIcon from '@material-ui/icons/Settings'
+import { History } from 'history'
+import * as React from 'react'
+import { useState } from 'react'
+import styled from 'styled-components'
+import { signOut } from '../../services/auth.service'
+
+const Style = styled.div`
+  padding: 0;
+  display: flex;
+  flex-direction: row;
+
+  .ChatsNavbar-title {
+    line-height: 56px;
+  }
+
+  .ChatsNavbar-options-btn {
+    float: right;
+    height: 100%;
+    font-size: 1.2em;
+    margin-right: -15px;
+    color: var(--primary-text);
+  }
+
+  .ChatsNavbar-rest {
+    flex: 1;
+    justify-content: flex-end;
+  }
+
+  .ChatsNavbar-options-item svg {
+    margin-right: 10px;
+  }
+`
+
+interface ChatsNavbarProps {
+  history: History
+}
+
+export default ({ history }: ChatsNavbarProps) => {
+  const [popped, setPopped] = useState(false)
+
+  const navToSettings = () => {
+    setPopped(false)
+    history.push('/settings')
+  }
+
+  const handleSignOut = () => {
+    setPopped(false)
+    signOut()
+
+    history.push('/sign-in')
+  }
+
+  return (
+    <Style className="ChatsNavbar">
+      <span className="ChatsNavbar-title">WhatsApp Clone</span>
+      <div className="ChatsNavbar-rest">
+        <Button className="ChatsNavbar-options-btn" onClick={setPopped.bind(null, true)}>
+          <MoreIcon />
+        </Button>
+      </div>
+      <Popover
+        open={popped}
+        onClose={setPopped.bind(null, false)}
+        anchorOrigin={{
+          vertical: 'top',
+          horizontal: 'right',
+        }}
+        transformOrigin={{
+          vertical: 'top',
+          horizontal: 'right',
+        }}
+      >
+        <Style>
+          <List>
+            <ListItem className="ChatsNavbar-options-item" button onClick={navToSettings}>
+              <SettingsIcon />
+              Settings
+            </ListItem>
+            <ListItem className="ChatsNavbar-options-item" button onClick={handleSignOut}>
+              <SignOutIcon />
+              Sign Out
+            </ListItem>
+          </List>
+        </Style>
+      </Popover>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatsListScreen/index.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/ChatsListScreen/index.tsx
@ -0,0 +1,19 @@
+import * as React from 'react'
+import { Suspense } from 'react'
+import { RouteComponentProps } from 'react-router-dom'
+import Navbar from '../Navbar'
+import AddChatButton from './AddChatButton'
+import ChatsList from './ChatsList'
+import ChatsNavbar from './ChatsNavbar'
+
+export default ({ history }: RouteComponentProps) => (
+  <div className="ChatsListScreen Screen">
+    <Navbar>
+      <ChatsNavbar history={history} />
+    </Navbar>
+    <Suspense fallback={null}>
+      <ChatsList history={history} />
+    </Suspense>
+    <AddChatButton history={history} />
+  </div>
+)
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/GroupDetailsScreen/CompleteGroupButton.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/GroupDetailsScreen/CompleteGroupButton.tsx
@ -0,0 +1,107 @@
+import Button from '@material-ui/core/Button'
+import ArrowRightIcon from '@material-ui/icons/ArrowRightAlt'
+import { defaultDataIdFromObject } from 'apollo-cache-inmemory'
+import gql from 'graphql-tag'
+import { History } from 'history'
+import * as React from 'react'
+import { useMutation } from 'react-apollo-hooks'
+import styled from 'styled-components'
+import { time as uniqid } from 'uniqid'
+import * as fragments from '../../graphql/fragments'
+import * as queries from '../../graphql/queries'
+import { CompleteGroupButtonMutation, Chat, Chats } from '../../graphql/types'
+import { useMe } from '../../services/auth.service'
+
+const Style = styled.div`
+  position: fixed;
+  right: 10px;
+  bottom: 10px;
+
+  button {
+    min-width: 50px;
+    width: 50px;
+    height: 50px;
+    border-radius: 999px;
+    background-color: var(--secondary-bg);
+    color: white;
+  }
+`
+
+const mutation = gql`
+  mutation CompleteGroupButtonMutation(
+    $userIds: [chat_users_insert_input!]!
+    $groupName: String!
+    $groupPicture: String
+    $ownerId: Int
+  ) {
+    insert_chat(objects: [{name: $groupName, picture: $groupPicture, owner_id: $ownerId, users:{data: $userIds}}]) {
+      returning {
+        ...chat
+      }
+    }
+  }
+  ${fragments.chat}
+`
+
+interface CompleteGroupButtonProps {
+  history: History
+  users: any
+  groupName: string
+  groupPicture: string
+}
+
+export default ({ history, users, groupName, groupPicture }: CompleteGroupButtonProps) => {
+  const me = useMe()
+
+  // business logic required.
+  const userIds = users.map(user => { return {user_id: user.id} });
+  userIds.push({user_id: me.id});
+  const addGroup = useMutation<CompleteGroupButtonMutation.Mutation, CompleteGroupButtonMutation.Variables>(mutation, {
+    variables: {
+      userIds: userIds,
+      groupName,
+      groupPicture,
+      ownerId: me.id
+    },
+    update: (client, { data: { insert_chat } }) => {
+      client.writeFragment<Chat.Fragment>({
+        id: defaultDataIdFromObject(insert_chat.returning[0]),
+        fragment: fragments.chat,
+        fragmentName: 'chat',
+        data: insert_chat.returning[0],
+      })
+
+      let chats
+      try {
+        chats = client.readQuery<Chats.Query>({
+          query: queries.chats,
+        }).chat
+      } catch (e) {}
+
+      if (chats && !chats.some(chat => chat.id === insert_chat.returning[0].id)) {
+        chats.unshift(insert_chat.returning[0])
+
+        client.writeQuery<Chats.Query>({
+          query: queries.chats,
+          data: { chat: chats },
+        })
+      }
+
+      // now insert group members chat_users
+    },
+  })
+
+  const onClick = () => {
+    addGroup().then(({ data: { insert_chat } }) => {
+      history.push(`/chats/${insert_chat.returning[0].id}`)
+    })
+  }
+
+  return (
+    <Style className="CompleteGroupButton">
+      <Button variant="contained" color="secondary" onClick={onClick}>
+        <ArrowRightIcon />
+      </Button>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/GroupDetailsScreen/GroupDetailsNavbar.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/GroupDetailsScreen/GroupDetailsNavbar.tsx
@ -0,0 +1,44 @@
+import Button from '@material-ui/core/Button'
+import ArrowBackIcon from '@material-ui/icons/ArrowBack'
+import { History } from 'history'
+import * as React from 'react'
+import styled from 'styled-components'
+
+const Style = styled.div`
+  padding: 0;
+  display: flex;
+  flex-direction: row;
+  margin-left: -20px;
+
+  .GroupDetailsNavbar-title {
+    line-height: 56px;
+  }
+
+  .GroupDetailsNavbar-back-button {
+    color: var(--primary-text);
+  }
+`
+
+interface GroupDetailsNavbarProps {
+  history: History
+  chatId?: string
+}
+
+export default ({ history, chatId }: GroupDetailsNavbarProps) => {
+  const navToNewGroup = () => {
+    if (chatId) {
+      history.push(`/chats/${chatId}`)
+    } else {
+      history.push('/new-chat/group')
+    }
+  }
+
+  return (
+    <Style className="GroupDetailsNavbar">
+      <Button className="GroupDetailsNavbar-back-button" onClick={navToNewGroup}>
+        <ArrowBackIcon />
+      </Button>
+      <div className="GroupDetailsNavbar-title">Group Details</div>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/GroupDetailsScreen/index.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/GroupDetailsScreen/index.tsx
@ -0,0 +1,253 @@
+import TextField from '@material-ui/core/TextField'
+import { defaultDataIdFromObject } from 'apollo-cache-inmemory'
+import gql from 'graphql-tag'
+import * as React from 'react'
+import { useState, useEffect } from 'react'
+import { MutationHookOptions } from 'react-apollo-hooks'
+import { useQuery, useMutation } from 'react-apollo-hooks'
+import { Redirect } from 'react-router-dom'
+import { RouteComponentProps } from 'react-router-dom'
+import styled from 'styled-components'
+import * as fragments from '../../graphql/fragments'
+import { GroupDetailsScreenQuery, GroupDetailsScreenUpdateMutation } from '../../graphql/types'
+import { useMe } from '../../services/auth.service'
+import { pickPicture, uploadProfilePicture } from '../../services/picture.service'
+import Navbar from '../Navbar'
+import CompleteGroupButton from './CompleteGroupButton'
+import GroupDetailsNavbar from './GroupDetailsNavbar'
+
+const Style = styled.div`
+  .GroupDetailsScreen-group-name {
+    width: calc(100% - 30px);
+    margin: 15px;
+  }
+
+  .GroupDetailsScreen-participants-title {
+    margin-top: 10px;
+    margin-left: 15px;
+  }
+
+  .GroupDetailsScreen-participants-list {
+    display: flex;
+    overflow: overlay;
+    padding: 0;
+  }
+
+  .GroupDetailsScreen-participant-item {
+    padding: 10px;
+    flex-flow: row wrap;
+    text-align: center;
+  }
+
+  .GroupDetailsScreen-participant-picture {
+    flex: 0 1 50px;
+    height: 50px;
+    width: 50px;
+    object-fit: cover;
+    border-radius: 50%;
+    display: block;
+    margin-left: auto;
+    margin-right: auto;
+  }
+
+  .GroupDetailsScreen-group-info {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+  }
+
+  .GroupDetailsScreen-participant-name {
+    line-height: 10px;
+    font-size: 14px;
+  }
+
+  .GroupDetailsScreen-group-picture {
+    width: 50px;
+    flex-basis: 50px;
+    border-radius: 50%;
+    margin-left: 15px;
+    object-fit: cover;
+    ${props => props.ownedByMe && 'cursor: pointer;'}
+  }
+`
+
+const query = gql`
+  query GroupDetailsScreenQuery($chatId: Int!) {
+    chat(where:{id: {_eq: $chatId}}) {
+        ...chat
+      users {
+        user {
+          ...user
+        }
+      }
+    }
+  }
+  ${fragments.chat}
+  ${fragments.user}
+`
+
+const updateMutation = gql`
+  mutation GroupDetailsScreenUpdateMutation($name: String, $picture: String, $chatId: Int!) {
+    update_chat(_set: {name: $name, picture: $picture}, where: {id: {_eq: $chatId}}) {
+      affected_rows
+      returning {
+        ...chat
+      }
+    }
+  }
+  ${fragments.chat}
+`
+
+export default ({ location, match, history }: RouteComponentProps) => {
+  const chatId = match.params.chatId
+  const me = useMe()
+
+  let ownedByMe: boolean
+  let users: any
+  let participants: any
+  let updateChat: () => any
+  let chatNameState
+  let chatPictureState
+
+  // The entire component functionality will be determined by the provided route param
+  if (chatId) {
+    const {
+      data: { chat },
+    } = useQuery<GroupDetailsScreenQuery.Query, GroupDetailsScreenQuery.Variables>(query, {
+      variables: { chatId },
+      suspend: true,
+    })
+    ownedByMe = chat[0].owner_id === me.id
+    users = chat[0].users
+    participants = users.map((user) => {
+      return user.user
+    });
+
+    // Read-only if not owned by me
+    if (ownedByMe) {
+      chatNameState = useState(chat[0].name)
+      chatPictureState = useState(chat[0].picture)
+    } else {
+      chatNameState = [chat[0].name, () => {}]
+      chatPictureState = [chat[0].picture, () => {}]
+    }
+
+    const [chatName] = chatNameState
+    const [chatPicture] = chatPictureState
+
+    updateChat = useMutation<GroupDetailsScreenUpdateMutation.Mutation>(updateMutation, {
+      variables: {
+        chatId,
+        name: chatName,
+        picture: chatPicture,
+      },
+      update: (client, { data: { update_chat } }) => {
+        chat[0].picture = update_chat.returning[0].picture
+        chat[0].name = update_chat.returning[0].name
+
+        client.writeFragment({
+          id: defaultDataIdFromObject(chat),
+          fragment: fragments.chat,
+          fragmentName: 'chat',
+          data: chat,
+        })
+      },
+    })
+
+    // Update picture once changed
+    useEffect(
+      () => {
+        if (chatPicture !== chat[0].picture) {
+          updateChat()
+        }
+      },
+      [chatPicture],
+    )
+  } else {
+    ownedByMe = true
+    updateChat = () => {}
+    chatNameState = useState('')
+    chatPictureState = useState('')
+    users = location.state.users
+    participants = [me].concat(users)
+  }
+
+  // Users are missing from state
+  if (!(users instanceof Array)) {
+    return <Redirect to="/chats" />
+  }
+
+  // Put me first
+  {
+    const index = participants.findIndex(participant => participant.id === me.id)
+    participants.splice(index, 1)
+    participants.unshift(me)
+  }
+
+  const [chatName, setChatName] = chatNameState
+  const [chatPicture, setChatPicture] = chatPictureState
+
+  const updateChatName = ({ target }) => {
+    setChatName(target.value)
+  }
+
+  const updateChatPicture = async () => {
+    // You have to be an admin
+    if (!ownedByMe) return
+
+    const file = await pickPicture()
+
+    if (!file) return
+
+    const { url } = await uploadProfilePicture(file)
+
+    setChatPicture(url)
+  }
+
+  return (
+    <Style className="GroupDetailsScreen Screen" ownedByMe={ownedByMe}>
+      <Navbar>
+        <GroupDetailsNavbar chatId={chatId} history={history} />
+      </Navbar>
+      <div className="GroupDetailsScreen-group-info">
+        <img
+          className="GroupDetailsScreen-group-picture"
+          src={chatPicture || '/assets/default-group-pic.jpg'}
+          onClick={updateChatPicture}
+        />
+        <TextField
+          label="Group name"
+          placeholder="Enter group name"
+          className="GroupDetailsScreen-group-name"
+          value={chatName}
+          onChange={updateChatName}
+          onBlur={updateChat}
+          disabled={!ownedByMe}
+          autoFocus={true}
+        />
+      </div>
+      <div className="GroupDetailsScreen-participants-title">
+        Participants: {participants.length}
+      </div>
+      <ul className="GroupDetailsScreen-participants-list">
+        {participants.map(participant => (
+          <div key={participant.id} className="GroupDetailsScreen-participant-item">
+            <img
+              src={participant.picture || '/assets/default-profile-pic.jpg'}
+              className="GroupDetailsScreen-participant-picture"
+            />
+            <span className="GroupDetailsScreen-participant-name">{participant.name}</span>
+          </div>
+        ))}
+      </ul>
+      {!chatId && chatName && (
+        <CompleteGroupButton
+          history={history}
+          groupName={chatName}
+          groupPicture={chatPicture}
+          users={users}
+        />
+      )}
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/Navbar.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/Navbar.tsx
@ -0,0 +1,24 @@
+import Toolbar from '@material-ui/core/Toolbar'
+import * as React from 'react'
+import styled from 'styled-components'
+
+const Style = styled(Toolbar)`
+  background-color: var(--primary-bg);
+  color: var(--primary-text);
+  font-size: 20px;
+  line-height: 40px;
+
+  .Navbar-body {
+    width: 100%;
+  }
+`
+
+interface NavbarProps {
+  children: any
+}
+
+export default ({ children }: NavbarProps) => (
+  <Style className="Navbar">
+    <div className="Navbar-body">{children}</div>
+  </Style>
+)
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewChatScreen/NewChatNavbar.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewChatScreen/NewChatNavbar.tsx
@ -0,0 +1,39 @@
+import Button from '@material-ui/core/Button'
+import ArrowBackIcon from '@material-ui/icons/ArrowBack'
+import { History } from 'history'
+import * as React from 'react'
+import styled from 'styled-components'
+
+const Style = styled.div`
+  padding: 0;
+  display: flex;
+  flex-direction: row;
+  margin-left: -20px;
+
+  .NewChatNavbar-title {
+    line-height: 56px;
+  }
+
+  .NewChatNavbar-back-button {
+    color: var(--primary-text);
+  }
+`
+
+interface NewChatNavbarProps {
+  history: History
+}
+
+export default ({ history }: NewChatNavbarProps) => {
+  const navToChats = () => {
+    history.push('/chats')
+  }
+
+  return (
+    <Style className="NewChatNavbar">
+      <Button className="NewChatNavbar-back-button" onClick={navToChats}>
+        <ArrowBackIcon />
+      </Button>
+      <div className="NewChatNavbar-title">New Chat</div>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewChatScreen/NewGroupButton.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewChatScreen/NewGroupButton.tsx
@ -0,0 +1,59 @@
+import Button from '@material-ui/core/Button'
+import GroupAddIcon from '@material-ui/icons/GroupAdd'
+import { History } from 'history'
+import * as React from 'react'
+import styled from 'styled-components'
+
+const Style = styled.div`
+  display: flex;
+
+  button {
+    border-radius: 0;
+    text-transform: none;
+    font-size: inherit;
+    width: 100%;
+    justify-content: flex-start;
+    padding-left: 15px;
+    padding-right: 15px;
+
+    svg {
+      font-size: 30px;
+      margin-top: 10px;
+    }
+  }
+
+  .NewGroupButton-icon {
+    height: 50px;
+    width: 50px;
+    object-fit: cover;
+    border-radius: 50%;
+    color: white;
+    background-color: var(--secondary-bg);
+  }
+
+  .NewGroupButton-title {
+    padding-left: 15px;
+    font-weight: bold;
+  }
+`
+
+interface NewGroupButtonProps {
+  history: History
+}
+
+export default ({ history }: NewGroupButtonProps) => {
+  const navToGroup = () => {
+    history.push('/new-chat/group')
+  }
+
+  return (
+    <Style>
+      <Button onClick={navToGroup}>
+        <div className="NewGroupButton-icon">
+          <GroupAddIcon />
+        </div>
+        <div className="NewGroupButton-title">New Group</div>
+      </Button>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewChatScreen/index.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewChatScreen/index.tsx
@ -0,0 +1,121 @@
+import { defaultDataIdFromObject } from 'apollo-cache-inmemory'
+import gql from 'graphql-tag'
+import * as React from 'react'
+import { Suspense } from 'react'
+import { useQuery, useMutation } from 'react-apollo-hooks'
+import { RouteComponentProps } from 'react-router-dom'
+import styled from 'styled-components'
+import { time as uniqid } from 'uniqid'
+import * as fragments from '../../graphql/fragments'
+import * as queries from '../../graphql/queries'
+import { NewChatScreenMutation, Chats, Chat } from '../../graphql/types'
+import { useMe } from '../../services/auth.service'
+import Navbar from '../Navbar'
+import UsersList from '../UsersList'
+import NewChatNavbar from './NewChatNavbar'
+import NewGroupButton from './NewGroupButton'
+
+const Style = styled.div`
+  .UsersList {
+    height: calc(100% - 56px);
+  }
+
+  .NewChatScreen-users-list {
+    height: calc(100% - 56px);
+    overflow-y: overlay;
+  }
+`
+
+const mutation = gql`
+  mutation NewChatScreenMutation($userId: Int!,$currentUserId: Int!) {
+    insert_chat(objects: [{
+      owner_id: null,
+      users: {
+        data: [
+          {user_id: $userId},
+          {user_id: $currentUserId}
+        ]
+      }
+    
+    }]) {
+      affected_rows
+      returning {
+        ...chat
+      }
+    }
+  }
+  ${fragments.chat}
+`;
+
+export default ({ history }: RouteComponentProps) => {
+  const me = useMe();
+
+  const addChat = useMutation<NewChatScreenMutation.Mutation, NewChatScreenMutation.Variables>(
+    mutation,
+    {
+      update: (client, { data: { insert_chat } }) => {
+        try {
+          client.writeFragment<Chat.Fragment>({
+            id: defaultDataIdFromObject(insert_chat.returning[0]),
+            fragment: fragments.chat,
+            fragmentName: 'chat',
+            data: insert_chat.returning[0],
+          })
+        } catch(e) {
+          console.error(e)
+        }
+
+        let chats
+        try {
+          chats = client.readQuery<Chats.Query>({
+            query: queries.chats,
+          })
+        } catch (e) {
+          console.error(e);
+        }
+
+        if (chats && chats.length && !chats.some(chat => chat.id === insert_chat.returning[0].id)) {
+          // move new chat to first
+          chats.unshift(insert_chat.returning[0])
+
+          client.writeQuery<Chats.Query>({
+            query: queries.chats,
+            data: { chat: chats },
+          })
+        }
+      },
+    },
+  );
+
+  const onUserPick = user => {
+    const selectedUserId = user.id;
+    if(user.isExisting) {
+      history.push(`/chats/${user.chat_id}`)
+    } else {
+      addChat({
+        variables: {
+          userId: user.id,
+          currentUserId: me.id
+        },
+      })
+      .then(({ data: { insert_chat } }) => {
+        history.push(`/chats/${insert_chat.returning[0].id}`)
+      })
+    }
+
+  }
+
+  return (
+    <Style className="NewChatScreen Screen">
+      <Navbar>
+        <NewChatNavbar history={history} />
+      </Navbar>
+      <div className="NewChatScreen-users-list">
+        <NewGroupButton history={history} />
+        <Suspense fallback={null}>
+          <UsersList onUserPick={onUserPick} />
+        </Suspense>
+      </div>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewGroupScreen/CreateGroupButton.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewGroupScreen/CreateGroupButton.tsx
@ -0,0 +1,43 @@
+import Button from '@material-ui/core/Button'
+import AddIcon from '@material-ui/icons/Add'
+import { History } from 'history'
+import * as React from 'react'
+import styled from 'styled-components'
+import { User } from '../../graphql/types'
+
+const Style = styled.div`
+  position: fixed;
+  right: 10px;
+  bottom: 10px;
+
+  button {
+    min-width: 50px;
+    width: 50px;
+    height: 50px;
+    border-radius: 999px;
+    background-color: var(--secondary-bg);
+    color: white;
+  }
+`
+
+interface CreateGroupButtonProps {
+  history: History
+  users: User.Fragment[]
+  // users: any[]
+}
+
+export default ({ history, users }: CreateGroupButtonProps) => {
+  const onClick = () => {
+    history.push('/new-chat/group/details', {
+      users,
+    })
+  }
+
+  return (
+    <Style className="CreateGroupButton">
+      <Button variant="contained" color="secondary" onClick={onClick}>
+        <AddIcon />
+      </Button>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewGroupScreen/NewGroupNavbar.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewGroupScreen/NewGroupNavbar.tsx
@ -0,0 +1,39 @@
+import Button from '@material-ui/core/Button'
+import ArrowBackIcon from '@material-ui/icons/ArrowBack'
+import { History } from 'history'
+import * as React from 'react'
+import styled from 'styled-components'
+
+const Style = styled.div`
+  padding: 0;
+  display: flex;
+  flex-direction: row;
+  margin-left: -20px;
+
+  .NewGroupNavbar-title {
+    line-height: 56px;
+  }
+
+  .NewGroupNavbar-back-button {
+    color: var(--primary-text);
+  }
+`
+
+interface NewGroupNavbarProps {
+  history: History
+}
+
+export default ({ history }: NewGroupNavbarProps) => {
+  const navToChats = () => {
+    history.push('/new-chat')
+  }
+
+  return (
+    <Style className="NewGroupNavbar">
+      <Button className="NewGroupNavbar-back-button" onClick={navToChats}>
+        <ArrowBackIcon />
+      </Button>
+      <div className="NewGroupNavbar-title">New Chat Group</div>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewGroupScreen/index.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/NewGroupScreen/index.tsx
@ -0,0 +1,32 @@
+import * as React from 'react'
+import { useState, Suspense } from 'react'
+import { RouteComponentProps } from 'react-router-dom'
+import styled from 'styled-components'
+import Navbar from '../Navbar'
+import UsersList from '../UsersList'
+import CreateGroupButton from './CreateGroupButton'
+import NewGroupNavbar from './NewGroupNavbar'
+
+const Style = styled.div`
+  .UsersList {
+    height: calc(100% - 56px);
+    overflow-y: overlay;
+  }
+`
+
+export default ({ history }: RouteComponentProps) => {
+  const [selectedUsers, setSelectedUsers] = useState([])
+
+  return (
+    <Style className="NewGroupScreen Screen">
+      <Navbar>
+        <NewGroupNavbar history={history} />
+      </Navbar>
+      <Suspense fallback={null}>
+        <UsersList selectable onSelectionChange={setSelectedUsers} />
+      </Suspense>
+
+      {!!selectedUsers.length && <CreateGroupButton history={history} users={selectedUsers} />}
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/SettingsScreen/SettingsForm.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/SettingsScreen/SettingsForm.tsx
@ -0,0 +1,130 @@
+import TextField from '@material-ui/core/TextField'
+import EditIcon from '@material-ui/icons/Edit'
+import { defaultDataIdFromObject } from 'apollo-cache-inmemory'
+import gql from 'graphql-tag'
+import * as React from 'react'
+import { useEffect, useState } from 'react'
+import { useMutation } from 'react-apollo-hooks'
+import { RouteComponentProps } from 'react-router-dom'
+import styled from 'styled-components'
+import * as fragments from '../../graphql/fragments'
+import { SettingsFormMutation, User } from '../../graphql/types'
+import { useMe } from '../../services/auth.service'
+import { pickPicture, uploadProfilePicture } from '../../services/picture.service'
+import Navbar from '../Navbar'
+import SettingsNavbar from './SettingsNavbar'
+
+const Style = styled.div`
+  .SettingsForm-picture {
+    max-width: 300px;
+    display: block;
+    margin: auto;
+    margin-top: 50px;
+
+    img {
+      object-fit: cover;
+      border-radius: 50%;
+      margin-bottom: -34px;
+      width: 300px;
+      height: 300px;
+    }
+
+    svg {
+      float: right;
+      font-size: 30px;
+      opacity: 0.5;
+      border-left: black solid 1px;
+      padding-left: 5px;
+      cursor: pointer;
+    }
+  }
+
+  .SettingsForm-name-input {
+    display: block;
+    margin: auto;
+    width: calc(100% - 50px);
+    margin-top: 50px;
+
+    > div {
+      width: 100%;
+    }
+  }
+`
+
+const mutation = gql`
+  mutation SettingsFormMutation($name: String, $picture: String, $userId: Int) {
+    update_users(_set: {name: $name, picture: $picture}, where: {id: {_eq: $userId}}) {
+      affected_rows
+      returning {
+        id
+        name
+        picture
+        username
+      }
+    }
+  }
+`
+
+export default ({ history }: RouteComponentProps) => {
+  const me = useMe()
+  const [myName, setMyName] = useState(me.name)
+  const [myPicture, setMyPicture] = useState(me.picture)
+
+  const updateUser = useMutation<SettingsFormMutation.Mutation, SettingsFormMutation.Variables>(
+    mutation,
+    {
+      variables: { name: myName, picture: myPicture, userId: me.id },
+      update: (client, { data: { update_users } }) => {
+        me.picture = myPicture
+        me.name = myPicture
+
+        client.writeFragment<User.Fragment>({
+          id: defaultDataIdFromObject(me),
+          fragment: fragments.user,
+          data: me,
+        })
+      },
+    },
+  )
+
+  useEffect(
+    () => {
+      if (myPicture !== me.picture) {
+        updateUser()
+      }
+    },
+    [myPicture],
+  )
+
+  const updateName = ({ target }) => {
+    setMyName(target.value)
+  }
+
+  const updatePicture = async () => {
+    const file = await pickPicture()
+
+    if (!file) return
+
+    const { url } = await uploadProfilePicture(file)
+
+    setMyPicture(url)
+  }
+
+  return (
+    <Style className={name}>
+      <div className="SettingsForm-picture">
+        <img src={myPicture || '/assets/default-profile-pic.jpg'} />
+        <EditIcon onClick={updatePicture} />
+      </div>
+      <TextField
+        className="SettingsForm-name-input"
+        label="Name"
+        value={myName}
+        onChange={updateName}
+        onBlur={updateUser}
+        margin="normal"
+        placeholder="Enter your name"
+      />
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/SettingsScreen/SettingsNavbar.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/SettingsScreen/SettingsNavbar.tsx
@ -0,0 +1,49 @@
+import Button from '@material-ui/core/Button'
+import ArrowBackIcon from '@material-ui/icons/ArrowBack'
+import { History } from 'history'
+import * as React from 'react'
+import styled from 'styled-components'
+
+const Style = styled.div`
+  padding: 0;
+  display: flex;
+  flex-direction: row;
+  margin-left: -20px;
+
+  .SettingsNavbar-title {
+    line-height: 56px;
+  }
+
+  .SettingsNavbar-back-button {
+    color: var(--primary-text);
+  }
+
+  .SettingsNavbar-picture {
+    height: 40px;
+    width: 40px;
+    margin-top: 3px;
+    margin-left: -22px;
+    object-fit: cover;
+    padding: 5px;
+    border-radius: 50%;
+  }
+`
+
+interface SettingsNavbarProps {
+  history: History
+}
+
+export default ({ history }: SettingsNavbarProps) => {
+  const navToChats = () => {
+    history.push('/chats')
+  }
+
+  return (
+    <Style className={name}>
+      <Button className="SettingsNavbar-back-button" onClick={navToChats}>
+        <ArrowBackIcon />
+      </Button>
+      <div className="SettingsNavbar-title">Settings</div>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/SettingsScreen/index.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/SettingsScreen/index.tsx
@ -0,0 +1,17 @@
+import * as React from 'react'
+import { Suspense } from 'react'
+import { RouteComponentProps } from 'react-router-dom'
+import Navbar from '../Navbar'
+import SettingsForm from './SettingsForm'
+import SettingsNavbar from './SettingsNavbar'
+
+export default ({ history }: RouteComponentProps) => (
+  <div className="SettingsScreen Screen">
+    <Navbar>
+      <SettingsNavbar history={history} />
+    </Navbar>
+    <Suspense fallback={null}>
+      <SettingsForm />
+    </Suspense>
+  </div>
+)
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/UsersList.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/components/UsersList.tsx
@ -0,0 +1,200 @@
+import List from '@material-ui/core/List'
+import ListItem from '@material-ui/core/ListItem'
+import CheckCircle from '@material-ui/icons/CheckCircle'
+import gql from 'graphql-tag'
+import * as React from 'react'
+import { useState } from 'react'
+import { useQuery } from 'react-apollo-hooks'
+import { useSubscription } from '../polyfills/react-apollo-hooks'
+import styled from 'styled-components'
+import * as fragments from '../graphql/fragments'
+import { ExistingChatUsers, RemainingUsers, RemainingUsersSub } from '../graphql/types'
+import { useMe } from '../services/auth.service'
+
+const Style = styled.div`
+  .UsersList-users-list {
+    padding: 0;
+  }
+
+  .UsersList-user-item {
+    position: relative;
+    padding: 7.5px 15px;
+    display: flex;
+    ${props => props.selectable && 'cursor: pointer;'}
+  }
+
+  .UsersList-profile-pic {
+    height: 50px;
+    width: 50px;
+    object-fit: cover;
+    border-radius: 50%;
+  }
+
+  .UsersList-name {
+    padding-left: 15px;
+    font-weight: bold;
+  }
+
+  .UsersList-checkmark {
+    position: absolute;
+    left: 50px;
+    top: 35px;
+    color: var(--secondary-bg);
+    background-color: white;
+    border-radius: 50%;
+  }
+`
+
+const existingUsersQuery = gql`
+  query ExistingChatUsers($userId: Int){
+    chat(where:{users:{user_id:{_eq:$userId}}, owner_id:{_is_null:true}}){
+      id
+      name
+      owner_id
+      users(order_by:[{user_id:desc}],where:{user_id:{_neq:$userId}}) {
+        user_id
+        user {
+          ...user
+        }
+      }
+    }
+  }
+  ${fragments.user}
+`;
+
+const remainingUsersQuery = gql`
+  query RemainingUsers($existingUsersId: [Int]) {
+    users(order_by:[{id:desc}],where:{id:{_nin:$existingUsersId}}){
+      ...user
+    }
+  }
+  ${fragments.user}
+`;
+
+const remainingUsersSubscription = gql`
+  subscription RemainingUsersSub($existingUsersId: [Int]) {
+    users(order_by:[{id:desc}],where:{id:{_nin:$existingUsersId}}){
+      ...user
+    }
+  }
+  ${fragments.user}
+`;
+
+interface UsersListProps {
+  selectable?: boolean
+  onSelectionChange?: (users: any[]) => void
+  // onUserPick?: (user: User.Fragment) => void
+  onUserPick?: (user: any[]) => void
+}
+
+export default (props: UsersListProps) => {
+  const { selectable, onSelectionChange, onUserPick } = {
+    selectable: false,
+    onSelectionChange: () => {},
+    onUserPick: () => {},
+    ...props,
+  }
+
+  const [selectedUsers, setSelectedUsers] = useState([])
+  const me = useMe()
+  const currentUserId = me.id;
+
+  const { data: { chat } } = useQuery<ExistingChatUsers.Query, ExistingChatUsers.Variables>(
+    existingUsersQuery,
+    {variables: {userId: me.id}, suspend: true}
+  );
+  let existingChatUsers
+  let existingUserIds
+  if(chat) {
+    existingChatUsers = chat.map((chat) => {
+      return({...chat.users[0].user, isExisting: true, chat_id: chat.id})
+    })
+    existingUserIds = chat.map((chat) => {
+      return(chat.users[0].user_id)
+    })
+  }
+  if(existingUserIds) {
+    existingUserIds.push(currentUserId);
+  }
+  useSubscription<RemainingUsersSub.Subscription, RemainingUsersSub.Variables>(
+    remainingUsersSubscription, { variables: {existingUsersId: existingUserIds},
+    // onSubscriptionData: ({ client, subscriptionData: { userUpdated } }) => {
+    onSubscriptionData: ({ client, subscriptionData: { users } }) => {
+      let queryUsers
+      try {
+        queryUsers = client.readQuery<RemainingUsers.Query, RemainingUsers.Variables>({
+          query: remainingUsersQuery,
+          variables: {existingUsersId: existingUserIds}
+        }).users
+      } catch (e) {
+        console.error(e);
+      }
+      if(queryUsers && users && users.length && !queryUsers.some(_user => _user.id === users[0].id)) {
+        const newUserList = queryUsers.unshift(users[0])
+        client.writeQuery<RemainingUsers.Query, RemainingUsers.Variables>({
+          query: remainingUsersQuery,
+          variables: {existingUsersId: existingUserIds},
+          data: { users: queryUsers },
+        })
+      }
+    }
+  })
+
+  const { data: { users } } = useQuery<RemainingUsers.Query, RemainingUsers.Variables>(
+    remainingUsersQuery,
+    {variables: {existingUsersId: existingUserIds}, suspend: true}
+  );
+
+  let remainingUsers;
+  if(users) {
+    remainingUsers = users.map((user) => {
+      return({...user, isExisting: false })
+    });
+  }
+  let finalUsers
+  if(existingChatUsers && remainingUsers) {
+    finalUsers = existingChatUsers.concat(remainingUsers)
+  }
+
+  const onListItemClick = user => {
+    if (!selectable) {
+      return onUserPick(user)
+    }
+    if (selectedUsers.includes(user)) {
+      const index = selectedUsers.indexOf(user)
+      selectedUsers.splice(index, 1)
+    } else {
+      selectedUsers.push(user)
+    }
+
+    setSelectedUsers(selectedUsers)
+    onSelectionChange(selectedUsers)
+  }
+
+  return (
+    <Style className="UsersList" selectable={selectable}>
+      <List className="UsersList-users-list">
+        {finalUsers.map(user => {
+          const isSelectedUser = selectedUsers.some((el) => { 
+            return el.id === user.id
+          });
+          return(
+          <ListItem
+            className="UsersList-user-item"
+            key={user.id}
+            button
+            onClick={onListItemClick.bind(null, user)}
+          >
+            <img
+              className="UsersList-profile-pic"
+              src={user.picture || '/assets/default-profile-pic.jpg'}
+            />
+            <div className="UsersList-name">{user.name}</div>
+
+            {isSelectedUser && <CheckCircle className="UsersList-checkmark" />}
+          </ListItem>
+        )})}
+      </List>
+    </Style>
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/.gitignore
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/.gitignore
@ -0,0 +1,2 @@
+introspection.json
+types.ts
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/chat.fragment.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/chat.fragment.ts
@ -0,0 +1,16 @@
+import gql from 'graphql-tag'
+import message from './message.fragment'
+
+export default gql `
+  fragment chat on chat {
+    id
+    name
+    picture
+    owner_id
+    created_at
+    messages(order_by:[{created_at: asc}]) {
+      ...message
+    }
+  }
+  ${message}
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/index.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/index.ts
@ -0,0 +1,4 @@
+export { default as chat } from './chat.fragment'
+export { default as message } from './message.fragment'
+export { default as messageUser } from './messageUser.fragment'
+export { default as user } from './user.fragment'
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/message.fragment.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/message.fragment.ts
@ -0,0 +1,14 @@
+import gql from 'graphql-tag'
+
+export default gql`
+  fragment message on message {
+    id
+    chat_id
+    sender {
+      id
+      name
+    }
+    content
+    created_at
+  }
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/messageUser.fragment.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/messageUser.fragment.ts
@ -0,0 +1,14 @@
+import gql from 'graphql-tag'
+
+export default gql`
+  fragment messageUser on message_user {
+    id
+    chat_id
+    sender {
+      id
+      name
+    }
+    content
+    created_at
+  }
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/user.fragment.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/fragments/user.fragment.ts
@ -0,0 +1,10 @@
+import gql from 'graphql-tag'
+
+export default gql`
+  fragment user on users {
+    id
+    username
+    name
+    picture
+  }
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/queries/chats.query.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/queries/chats.query.ts
@ -0,0 +1,15 @@
+import gql from 'graphql-tag'
+import * as fragments from '../fragments'
+
+export default gql `
+  query Chats {
+    chat {
+      ...chat
+      messages {
+      	...message
+      }
+    }
+  }
+  ${fragments.chat}
+  ${fragments.message}
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/queries/index.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/queries/index.ts
@ -0,0 +1,3 @@
+export { default as chats } from './chats.query'
+export { default as users } from './users.query'
+export { default as me } from './me.query'
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/queries/me.query.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/queries/me.query.ts
@ -0,0 +1,11 @@
+import gql from 'graphql-tag'
+import * as fragments from '../fragments'
+
+export default gql `
+  query Me {
+    users {
+      ...user
+    }
+  }
+  ${fragments.user}
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/queries/users.query.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/queries/users.query.ts
@ -0,0 +1,11 @@
+import gql from 'graphql-tag'
+import * as fragments from '../fragments'
+
+export default gql `
+  query Users {
+    users {
+      ...user
+    }
+  }
+  ${fragments.user}
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/subscriptions/chatUpdated.subscription.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/subscriptions/chatUpdated.subscription.ts
@ -0,0 +1,17 @@
+import gql from 'graphql-tag'
+import * as fragments from '../fragments'
+
+export default gql `
+  subscription ChatsListQuerySubUpdate($userId: Int!) {
+    chat(order_by:[{messages_aggregate:{max:{created_at:desc}}}]) {
+      ...chat
+      users(where:{user_id:{_neq:$userId}}) {
+        user {
+          ...user
+        }
+      }
+    }
+  }
+  ${fragments.chat}
+  ${fragments.user}
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/subscriptions/index.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/subscriptions/index.ts
@ -0,0 +1,3 @@
+export { default as chatUpdated } from './chatUpdated.subscription'
+export { default as messageAdded } from './messageAdded.subscription'
+export { default as userUpdated } from './userUpdated.subscription'
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/subscriptions/messageAdded.subscription.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/subscriptions/messageAdded.subscription.ts
@ -0,0 +1,11 @@
+import gql from 'graphql-tag'
+import * as fragments from '../fragments'
+
+export default gql `
+  subscription MessageAdded {
+    message_user {
+      ...messageUser
+    }
+  }
+  ${fragments.messageUser}
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/subscriptions/userUpdated.subscription.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/graphql/subscriptions/userUpdated.subscription.ts
@ -0,0 +1,11 @@
+import gql from 'graphql-tag'
+import * as fragments from '../fragments'
+
+export default gql `
+  subscription UserUpdated {
+    users(order_by:[{id:desc}]) {
+      ...user
+    }
+  }
+  ${fragments.user}
+`
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/index.css
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/index.css
@ -0,0 +1,26 @@
+:root {
+  --primary-bg: #2c6157;
+  --secondary-bg: #6fd056;
+  --primary-text: white;
+  --secondary-text: white;
+}
+
+html {
+  height: 100%;
+}
+
+body {
+  height: 100%;
+  margin: 0;
+  padding: 0;
+  font-family: Roboto, "Helvetica Neue", sans-serif;
+}
+
+#root {
+  height: 100%;
+}
+
+.Screen {
+  position: relative;
+  height: 100%;
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/index.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/index.tsx
@ -0,0 +1,34 @@
+import { MuiThemeProvider, createMuiTheme } from '@material-ui/core/styles'
+import React from 'react';
+import { Suspense } from 'react'
+import ReactDOM from 'react-dom';
+import { ApolloProvider } from 'react-apollo-hooks';
+import './index.css';
+import App from './App';
+import apolloClient from './apollo-client'
+import * as serviceWorker from './serviceWorker';
+
+const theme = createMuiTheme({
+  palette: {
+    primary: { main: '#2c6157' },
+    secondary: { main: '#6fd056' },
+  },
+  typography: {
+    useNextVariants: true,
+  },
+})
+
+ReactDOM.render(
+  <MuiThemeProvider theme={theme}>
+    <ApolloProvider client={apolloClient}>
+      <Suspense fallback={null}>
+        <App />
+      </Suspense>
+    </ApolloProvider>
+  </MuiThemeProvider>
+, document.getElementById('root'));
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: http://bit.ly/CRA-PWA
+serviceWorker.unregister();
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/logo.svg
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/logo.svg
@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
+    <g fill="#61DAFB">
+        <path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
+        <circle cx="420.9" cy="296.5" r="45.7"/>
+        <path d="M520.5 78.1z"/>
+    </g>
+</svg>
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/polyfills/react-apollo-hooks.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/polyfills/react-apollo-hooks.ts
@ -0,0 +1,72 @@
+import { DataProxy } from 'apollo-cache'
+import { OperationVariables, FetchPolicy } from 'apollo-client'
+import { DocumentNode, GraphQLError } from 'graphql'
+import { useEffect, useMemo, useRef, useState } from 'react'
+import { useApolloClient } from 'react-apollo-hooks'
+import * as isEqual from 'react-fast-compare'
+
+export type SubscriptionOptions<T, TVariables> = {
+  variables?: TVariables
+  fetchPolicy?: FetchPolicy
+  onSubscriptionData?: (options?: { client?: DataProxy; subscriptionData?: T }) => any
+}
+
+export const useSubscription = <T, TVariables = OperationVariables>(
+  query: DocumentNode,
+  options: SubscriptionOptions<T, TVariables> = {},
+): {
+  data: T | { [key: string]: void }
+  error?: GraphQLError
+  loading: boolean
+} => {
+  const onSubscriptionData = options.onSubscriptionData
+  const prevOptions = useRef<typeof options | null>(null)
+  const client = useApolloClient()
+  const [data, setData] = useState<T | {}>({})
+  const [error, setError] = useState<GraphQLError | null>(null)
+  const [loading, setLoading] = useState<boolean>(true)
+
+  const subscriptionOptions = {
+    query,
+    variables: options.variables,
+    fetchPolicy: options.fetchPolicy,
+  }
+
+  useEffect(
+    () => {
+      prevOptions.current = subscriptionOptions
+      const subscription = client
+        .subscribe<{ data: T }, TVariables>(subscriptionOptions)
+        .subscribe({
+          next: ({ data }) => {
+            setData(data)
+
+            if (onSubscriptionData) {
+              onSubscriptionData({ client, subscriptionData: data })
+            }
+          },
+          error: err => {
+            setError(err)
+            setLoading(false)
+          },
+          complete: () => {
+            setLoading(false)
+          },
+        })
+
+      return () => {
+        subscription.unsubscribe()
+      }
+    },
+    [isEqual(prevOptions.current, subscriptionOptions) ? prevOptions.current : subscriptionOptions],
+  )
+
+  return useMemo(
+    () => ({
+      data,
+      error,
+      loading,
+    }),
+    [data, error, loading],
+  )
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/react-app-env.d.ts
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/react-app-env.d.ts
@ -0,0 +1 @@
+/// <reference types="react-scripts" />
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/serviceWorker.js
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/serviceWorker.js
@ -0,0 +1,135 @@
+// This optional code is used to register a service worker.
+// register() is not called by default.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on subsequent visits to a page, after all the
+// existing tabs open on the page have been closed, since previously cached
+// resources are updated in the background.
+
+// To learn more about the benefits of this model and instructions on how to
+// opt-in, read http://bit.ly/CRA-PWA
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.1/8 is considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+export function register(config) {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Let's check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl, config);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit http://bit.ly/CRA-PWA'
+          );
+        });
+      } else {
+        // Is not localhost. Just register service worker
+        registerValidSW(swUrl, config);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl, config) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        if (installingWorker == null) {
+          return;
+        }
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the updated precached content has been fetched,
+              // but the previous service worker will still serve the older
+              // content until all client tabs are closed.
+              console.log(
+                'New content is available and will be used when all ' +
+                  'tabs for this page are closed. See http://bit.ly/CRA-PWA.'
+              );
+
+              // Execute callback
+              if (config && config.onUpdate) {
+                config.onUpdate(registration);
+              }
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.');
+
+              // Execute callback
+              if (config && config.onSuccess) {
+                config.onSuccess(registration);
+              }
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl, config) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl)
+    .then(response => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      const contentType = response.headers.get('content-type');
+      if (
+        response.status === 404 ||
+        (contentType != null && contentType.indexOf('javascript') === -1)
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then(registration => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl, config);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      );
+    });
+}
+
+export function unregister() {
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.ready.then(registration => {
+      registration.unregister();
+    });
+  }
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/services/auth.service.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/services/auth.service.tsx
@ -0,0 +1,89 @@
+import * as React from 'react'
+import { useContext } from 'react'
+import { useQuery } from 'react-apollo-hooks'
+import { Redirect } from 'react-router-dom'
+import store from '../apollo-client'
+import * as queries from '../graphql/queries'
+import { Me } from '../graphql/types'
+import { useSubscriptions } from './cache.service'
+
+const MyContext = React.createContext(null)
+
+export const useMe = () => {
+  return useContext(MyContext)
+}
+
+export const withAuth = (Component: React.ComponentType) => {
+  return props => {
+    if (!getAuthHeader()) return <Redirect to="/sign-in" />
+
+    // Validating against server
+    const fetchUser = useQuery<Me.Query, Me.Variables>(queries.me, { suspend: true, context: { headers: {'x-hasura-role': 'mine'}} })
+    const myResult = fetchUser.data.users ? fetchUser.data.users[0] : {};
+
+    useSubscriptions(myResult)
+
+    return (
+      <MyContext.Provider value={myResult}>
+        <Component {...props} />
+      </MyContext.Provider>
+    )
+  }
+}
+
+export const storeAuthHeader = (auth: string) => {
+  localStorage.setItem('Authorization', 'Bearer '+auth)
+}
+
+export const getAuthHeader = (): string | null => {
+  return localStorage.getItem('Authorization') || null
+}
+
+export const signIn = ({ username, password }) => {
+
+  return fetch(`${process.env.REACT_APP_AUTH_URL}/login`, {
+    method: 'POST',
+    body: JSON.stringify({ username, password }),
+    headers: {
+      'Content-Type': 'application/json'
+    },
+  })
+  .then(res => {
+    if (res.status < 400) {
+      return res.json().then((data) => {
+        const token = data.token;
+        storeAuthHeader(token);
+      });
+    } else {
+      return Promise.reject(res.statusText)
+    }
+  })
+}
+
+export const signUp = ({ username, password, name }) => {
+  return fetch(`${process.env.REACT_APP_AUTH_URL}/signup`, {
+    method: 'POST',
+    body: JSON.stringify({ name, username, password, confirmPassword: password }),
+    headers: {
+      Accept: 'application/json',
+      'Content-Type': 'application/json'
+    },
+  })
+}
+
+export const signOut = () => {
+  localStorage.removeItem('Authorization')
+  // window.location.href = '/sign-in'
+
+  return store.clearStore()
+}
+
+export default {
+  useMe,
+  withAuth,
+  storeAuthHeader,
+  getAuthHeader,
+  signIn,
+  signUp,
+  signOut,
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/services/cache.service.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/services/cache.service.tsx
@ -0,0 +1,97 @@
+import { defaultDataIdFromObject } from 'apollo-cache-inmemory'
+import * as fragments from '../graphql/fragments'
+import * as subscriptions from '../graphql/subscriptions'
+import * as queries from '../graphql/queries'
+import gql from 'graphql-tag'
+import {
+  ChatsListQuerySubUpdate,
+  ChatsListQueryCache,
+  MessageAdded,
+  UserUpdated,
+} from '../graphql/types'
+import { useSubscription } from '../polyfills/react-apollo-hooks'
+
+const query = gql`
+  query ChatsListQueryCache($userId: Int!) {
+    chat(order_by:[{messages_aggregate:{max:{created_at:desc}}}]) {
+      ...chat
+      users(where:{user_id:{_neq:$userId}}) {
+        user {
+          ...user
+        }
+      }
+    }
+  }
+  ${fragments.chat}
+  ${fragments.user}
+`;
+
+export const useSubscriptions = (userResult) => {
+  useSubscription<ChatsListQuerySubUpdate.Subscription, ChatsListQuerySubUpdate.Variables>(
+    subscriptions.chatUpdated, { variables: {userId: userResult.id},
+    onSubscriptionData: ({ client, subscriptionData: { chat } }) => {
+      let chats
+      if(chat && chat.length) {
+        try {
+          chats = client.readQuery<ChatsListQueryCache.Query, ChatsListQueryCache.Variables>({
+            query: query,
+            variables: {userId: userResult.id}
+          }).chat
+        } catch(e) {
+          console.error(e)
+        }
+        if (chats && !chats.some(_chat => _chat.id === chat[0].id)) {
+          chats.unshift(chat[0])
+          try {
+            client.writeQuery<ChatsListQueryCache.Query, ChatsListQueryCache.Variables>({
+              query: query,
+              variables: {userId: userResult.id},
+              data: { chat: chats },
+            })
+          } catch(e) {
+            console.error(e)
+          }
+        }
+      }
+    },
+  })
+
+  useSubscription<MessageAdded.Subscription>(subscriptions.messageAdded, {
+    onSubscriptionData: ({ client, subscriptionData: { message_user } }) => {
+      let chatId
+      let chats
+      if(message_user && message_user.length) {
+        chatId = message_user[0].chat_id
+        try {
+          chats = client.readQuery<ChatsListQueryCache.Query, ChatsListQueryCache.Variables>({
+            query: query,
+            variables: {userId: userResult.id}
+          }).chat
+          // find array index of new message's chat id in existing cache
+          const chatIndex = chats.findIndex(elem => elem.id === chatId)
+          const finalChats = [chats[chatIndex], ...chats.filter((item) => item.id !== chatId)]
+          client.writeQuery({
+            query: query,
+            variables: {userId: userResult.id},
+            data: { chat: finalChats },
+          })
+        } catch(e) {
+          console.error(e)
+        }
+
+      }
+    },
+  })
+
+  useSubscription<UserUpdated.Subscription>(subscriptions.userUpdated, {
+    onSubscriptionData: ({ client, subscriptionData: { users } }) => {
+      if(users && users[0]) {
+        client.writeFragment({
+          id: defaultDataIdFromObject(users[0]),
+          fragment: fragments.user,
+          data: users[0],
+        })
+      }
+    },
+  })
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/services/picture.service.tsx
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/src/services/picture.service.tsx
@ -0,0 +1,31 @@
+import { getAuthHeader } from './auth.service'
+
+export const pickPicture = () => {
+  return new Promise((resolve, reject) => {
+    const input = document.createElement('input')
+    input.type = 'file'
+    input.accept = 'image/*'
+    input.onchange = e => {
+      const target = e.target as HTMLInputElement
+      resolve(target.files[0])
+    }
+    input.onerror = reject
+    input.click()
+  })
+}
+
+export const uploadProfilePicture = file => {
+  const formData = new FormData()
+  formData.append('file', file)
+  formData.append('upload_preset', 'profile-pic')
+
+  return fetch(`${process.env.REACT_APP_AUTH_URL}/upload-profile-pic`, {
+    method: 'POST',
+    body: formData,
+    headers: {
+      Authorization: getAuthHeader(),
+    }
+  }).then(res => {
+    return res.json()
+  })
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/tsconfig.json
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/tsconfig.json
@ -0,0 +1,35 @@
+{
+  "compilerOptions": {
+    "outDir": "build/dist",
+    "sourceMap": true,
+    "declaration": false,
+    "moduleResolution": "node",
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "downlevelIteration": true,
+    "resolveJsonModule": true,
+    "target": "es5",
+    "jsx": "preserve",
+    "typeRoots": [
+      "node_modules/@types"
+    ],
+    "lib": [
+      "es2017",
+      "dom",
+      "esnext.asynciterable"
+    ],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "esModuleInterop": false,
+    "allowSyntheticDefaultImports": true,
+    "forceConsistentCasingInFileNames": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "noImplicitAny": false,
+    "strict": false,
+    "module": "esnext"
+  },
+  "include": [
+    "src"
+  ]
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/tslint.json
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/tslint.json
@ -0,0 +1,29 @@
+{
+  "extends": ["tslint:recommended", "tslint-react", "tslint-config-prettier"],
+  "rules": {
+    "ordered-imports": false,
+    "object-literal-sort-keys": false,
+    "jsx-boolean-value": false,
+    "interface-name" : false,
+    "variable-name": false,
+    "no-string-literal": false,
+    "no-namespace": false,
+    "interface-over-type-literal": false,
+    "no-shadowed-variable": false,
+    "curly": false,
+    "no-label": false,
+    "no-empty": false,
+    "no-debugger": false,
+    "no-console": false,
+    "array-type": false
+  },
+  "linterOptions": {
+    "exclude": [
+      "config/**/*.js",
+      "node_modules/**/*.ts",
+      "coverage/lcov-report/*.js",
+      "*.json",
+      "**/*.json"
+    ]
+  }
+}
--- a/community/sample-apps/whatsapp-clone-typescript-react/react-app/yarn.lock
+++ b/community/sample-apps/whatsapp-clone-typescript-react/react-app/yarn.lock