Use heroku-postbuild instead of bash syntax postinstall

2017-02-08 08:55:26 -08:00
18 changed files with 1309 additions and 17329 deletions
--- a/README.md
+++ b/README.md
@@ -1,34 +1,27 @@
 # create-react-app with a Node server on Heroku

-A minimal example of using a Node backend (server for API, proxy, & routing) with a [React frontend](https://github.com/facebookincubator/create-react-app).
+A minimal example of using a Node backend (API, proxy, & routing) with a [React app](https://github.com/facebookincubator/create-react-app) and an [Express server](http://expressjs.com).

-* 📐 [Design Points](#user-content-design-points)
-* 🕺 [Demo](#user-content-demo)
-* 🚀 [Deploy to Heroku](#user-content-deploy-to-heroku)
-* ⤵️ [Switching from create-react-app-buildpack](#user-content-switching-from-create-react-app-buildpack)
-* 🎛 [Runtime Config](#user-content-runtime-config)
-* 💻 [Local Development](#user-content-local-development)
-
-To deploy a frontend-only React app, use the static-site optimized  
+To deploy a frontend-only React app, use the static-site optimized
 ▶️ [create-react-app-buildpack](https://github.com/mars/create-react-app-buildpack)


 ## Design Points

-A combo of two npm projects, the backend server and the frontend UI. So there are two `package.json` configs and thereforce [two places to run `npm` commands](#user-content-local-development):
+A combo of two npm projects, the backend and the frontend. So there are two `package.json` configs.

-  1. [**Node server**](server/): [`./package.json`](package.json)
-      * [deployed automatically](https://devcenter.heroku.com/categories/deployment) via heroku/nodejs buildpack
-  2. [**React UI**](react-ui/): [`react-ui/package.json`](react-ui/package.json)
+  1. [`package.json`](package.json) for [Node server](server/) & [Heroku deploy](https://devcenter.heroku.com/categories/deployment)
+      * `postinstall` script builds the React UI webpack bundle
+      * `cacheDirectories` includes `react-ui/node_modules/` to optimize deploy to Heroku
+  2. [`react-ui/package.json`](react-ui/package.json) for [React web UI](react-ui/)
      * generated by [create-react-app](https://github.com/facebookincubator/create-react-app)
-      * deployed via `build` script in the Node server's [`./package.json`](package.json)
-      * module cache configured by `cacheDirectories`

-Includes a minimal [Node Cluster](https://nodejs.org/docs/latest-v8.x/api/cluster.html) [implementation](server/index.js) to parallelize the single-threaded Node process across the available CPU cores.

-## Demo
+## Punchline

-[Demo deployment](https://cra-node.herokuapp.com/): example API call from the React UI is [fetched with a relative URL](react-ui/src/App.js#L16) that is served by an Express handler in the Node server.
+[Demo deployment](https://cra-node.herokuapp.com/).
+
+Example API call is [fetched from relative URL](react-ui/src/App.js#L16).


 ## Deploy to Heroku
@@ -45,80 +38,17 @@ This deployment will automatically:
  * detect [Node buildpack](https://elements.heroku.com/buildpacks/heroku/heroku-buildpack-nodejs)
  * build the app with
    * `npm install` for the Node server
-    * `npm run build` for create-react-app
+    * `postinstall` to build the webpack bundle from create-react-app
  * launch the web process with `npm start`
    * serves `../react-ui/build/` as static files
    * customize by adding API, proxy, or route handlers/redirectors

-⚠️ Using npm 5’s new `package-lock.json`? We resolved a compatibility issue. See [PR](https://github.com/mars/heroku-cra-node/pull/10) for more details.
-
 👓 More about [deploying to Heroku](https://devcenter.heroku.com/categories/deployment).


-## Switching from create-react-app-buildpack
-
-If an app was previously deployed with [create-react-app-buildpack](https://github.com/mars/create-react-app-buildpack), then a few steps are required to migrate the app to this architecture:
-
-1. Remove **create-react-app-buildpack** from the app; [heroku/nodejs buildpack](https://devcenter.heroku.com/articles/nodejs-support#activation) will be automatically activated
-  
-    ```bash
-    heroku buildpacks:clear
-    ```
-1. Move the root React app files (including dotfiles) into a `react-ui/` subdirectory
-
-    ```bash
-    mkdir react-ui
-    git mv -k [!react-ui]* react-ui/
-    mv node_modules react-ui/
-    
-    # If you see "fatal: Not a git repository", then fix that error
-    mv react-ui/.git ./
-    ```
-    ⚠️ *Some folks have reported problems with these commands. Using the `bash` shell will probably allow them to work. Sorry if they do not work for you, know that the point is to move **everything** in the repo into the `react-ui/` subdirectory. Except for `.git/` which should remain at the root level.* 
-1. Create a root [`package.json`](package.json), [`server/`](server/), & [`.gitignore`](.gitignore) modeled after the code in this repo
-1. Commit and deploy ♻️
-  
-    ```bash
-    git add -A
-    git commit -m 'Migrate from create-react-app-buildpack to Node server'
-    git push heroku master
-    ```
-1. If the app uses [Runtime configuration](https://github.com/mars/create-react-app-buildpack/blob/master/README.md#user-content-runtime-configuration), then follow [Runtime config](#user-content-runtime-config) below to keep it working.
-
-## Runtime Config
-
-create-react-app itself supports [configuration with environment variables](https://facebook.github.io/create-react-app/docs/adding-custom-environment-variables). These compile-time variables are embedded in the bundle during the build process, and may go stale when the app slug is promoted through a pipeline or otherwise changed without a rebuild. See create-react-app-buildpack's docs for further elaboration of [compile-time vs runtime variables](https://github.com/mars/create-react-app-buildpack/blob/master/README.md#user-content-compile-time-vs-runtime).
-
-[create-react-app-buildpack's runtime config](https://github.com/mars/create-react-app-buildpack/blob/master/README.md#user-content-runtime-configuration) makes it possible to dynamically change variables, no rebuild required. That runtime config technique may be applied to Node.js based apps such as this one.
-
-1. Add the inner buildpack to your app, so that the `heroku/nodejs` buildpack is last:
-
-   ```bash
-   heroku buildpacks:add -i 1 https://github.com/mars/create-react-app-inner-buildpack
-   
-   # Verify that create-react-app-inner-buildpack comes before nodejs
-   heroku buildpacks
-   ```
-2. Set the bundle location for runtime config injection:
-
-   ```bash
-   heroku config:set JS_RUNTIME_TARGET_BUNDLE=/app/react-ui/build/static/js/*.js
-   ```
-3. Now, build the app with this new setup:
-
-   ```bash
-   git commit --allow-empty -m 'Enable runtime config with create-react-app-inner-buildpack'
-   git push heroku master
-   ```
-
 ## Local Development

-Because this app is made of two npm projects, there are two places to run `npm` commands:
-
-1. **Node API server** at the root `./`
-1. **React UI** in `react-ui/` directory.
-
-### Run the API server
+### Run the API Server

 In a terminal:

@@ -130,12 +60,6 @@ npm install
 npm start
 ```

-#### Install new npm packages for Node
-
-```bash
-npm install package-name --save
-```
-

 ### Run the React UI

@@ -153,12 +77,3 @@ npm install
 # Start the server
 npm start
 ```
-
-#### Install new npm packages for React UI
-
-```bash
-# Always change directory, first
-cd react-ui/
-
-npm install package-name --save
-```
--- a/app.json
+++ b/app.json
@@ -1,21 +0,0 @@
-{
-  "name": "heroku-cra-node",
-  "description": "web app made of create-react-app UI + Node API",
-  "scripts": {
-  },
-  "env": {
-  },
-  "formation": {
-    "web": {
-      "quantity": 1
-    }
-  },
-  "addons": [
-
-  ],
-  "buildpacks": [
-    {
-      "url": "heroku/nodejs"
-    }
-  ]
-}
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,358 +0,0 @@
-{
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-  "version": "3.0.0",
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-      }
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-        "debug": "2.6.9",
-        "depd": "~1.1.2",
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-      "version": "0.16.2",
-      "resolved": "https://registry.npmjs.org/send/-/send-0.16.2.tgz",
-      "integrity": "sha512-E64YFPUssFHEFBvpbbjr44NCLtI1AohxQ8ZSiJjQLskAdKuriYEP6VyGEsRDH8ScozGpkaX1BGvhanqCwkcEZw==",
-      "requires": {
-        "debug": "2.6.9",
-        "depd": "~1.1.2",
-        "destroy": "~1.0.4",
-        "encodeurl": "~1.0.2",
-        "escape-html": "~1.0.3",
-        "etag": "~1.8.1",
-        "fresh": "0.5.2",
-        "http-errors": "~1.6.2",
-        "mime": "1.4.1",
-        "ms": "2.0.0",
-        "on-finished": "~2.3.0",
-        "range-parser": "~1.2.0",
-        "statuses": "~1.4.0"
-      }
-    },
-    "serve-static": {
-      "version": "1.13.2",
-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.13.2.tgz",
-      "integrity": "sha512-p/tdJrO4U387R9oMjb1oj7qSMaMfmOyd4j9hOFoxZe2baQszgHcSWjuya/CiT5kgZZKRudHNOA0pYXOl8rQ5nw==",
-      "requires": {
-        "encodeurl": "~1.0.2",
-        "escape-html": "~1.0.3",
-        "parseurl": "~1.3.2",
-        "send": "0.16.2"
-      }
-    },
-    "setprototypeof": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
-      "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ=="
-    },
-    "statuses": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
-      "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew=="
-    },
-    "type-is": {
-      "version": "1.6.16",
-      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
-      "integrity": "sha512-HRkVv/5qY2G6I8iab9cI7v1bOIdhm94dVjQCPFElW9W+3GeDOSHmy2EBYe4VTApuzolPcmgFTN3ftVJRKR2J9Q==",
-      "requires": {
-        "media-typer": "0.3.0",
-        "mime-types": "~2.1.18"
-      }
-    },
-    "unpipe": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
-      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
-    },
-    "utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
-    },
-    "vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
-    }
-  }
-}
--- a/package.json
+++ b/package.json
@@ -1,20 +1,20 @@
 {
  "name": "heroku-cra-node",
-  "version": "3.0.0",
+  "version": "1.0.0",
  "description": "How to use create-react-app with a custom Node API on Heroku",
  "engines": {
-    "node": "10.x"
+    "node": "6.9.x"
  },
  "scripts": {
    "start": "node server",
-    "build": "cd react-ui/ && npm install && npm run build"
+    "heroku-postbuild": "cd react-ui/ && npm install --only=dev && npm install && npm run build"
  },
  "cacheDirectories": [
    "node_modules",
    "react-ui/node_modules"
  ],
  "dependencies": {
-    "express": "^4.16.4"
+    "express": "^4.14.1"
  },
  "repository": {
    "type": "git",
--- a/react-ui/.gitignore
+++ b/react-ui/.gitignore
@@ -1,23 +1,15 @@
-# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+# See http://help.github.com/ignore-files/ for more about ignoring files.

 # dependencies
-/node_modules
-/.pnp
-.pnp.js
+node_modules

 # testing
-/coverage
+coverage

 # production
-/build
+build

 # misc
 .DS_Store
-.env.local
-.env.development.local
-.env.test.local
-.env.production.local
-
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
+.env
+npm-debug.log
--- a/react-ui/README.md
+++ b/react-ui/README.md
--- a/react-ui/package-lock.json
+++ b/react-ui/package-lock.json
--- a/react-ui/package.json
+++ b/react-ui/package.json
@@ -2,25 +2,19 @@
  "name": "react-ui",
  "version": "0.1.0",
  "private": true,
+  "devDependencies": {
+    "react-scripts": "0.8.5"
+  },
  "dependencies": {
-    "react": "^16.8.6",
-    "react-dom": "^16.8.6",
-    "react-scripts": "^2.1.8"
+    "react": "^15.4.2",
+    "react-dom": "^15.4.2",
+    "whatwg-fetch": "^2.0.2"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
-    "test": "react-scripts test",
+    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  },
-  "eslintConfig": {
-    "extends": "react-app"
-  },
-  "browserslist": [
-    ">0.2%",
-    "not dead",
-    "not ie <= 11",
-    "not op_mini all"
-  ],
  "proxy": "http://localhost:5000"
 }
--- a/react-ui/public/favicon.ico
+++ b/react-ui/public/favicon.ico
--- a/react-ui/public/index.html
+++ b/react-ui/public/index.html
@@ -1,17 +1,11 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
  <head>
    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
    <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.
+      Notice the use of %PUBLIC_URL% in the tag 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.

@@ -22,9 +16,6 @@
    <title>React App</title>
  </head>
  <body>
-    <noscript>
-      You need to enable JavaScript to run this app.
-    </noscript>
    <div id="root"></div>
    <!--
      This HTML file is a template.
@@ -33,8 +24,8 @@
      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`.
+      To begin the development, run `npm start`.
+      To create a production bundle, use `npm run build`.
    -->
  </body>
 </html>
--- a/react-ui/public/manifest.json
+++ b/react-ui/public/manifest.json
@@ -1,15 +0,0 @@
-{
-  "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/react-ui/src/App.css
+++ b/react-ui/src/App.css
@@ -4,29 +4,25 @@

 .App-logo {
  animation: App-logo-spin infinite 20s linear;
-  height: 40vmin;
+  height: 80px;
 }

 .App-header {
-  background-color: #282c34;
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  font-size: calc(10px + 2vmin);
+  background-color: #222;
+  height: 150px;
+  padding: 20px;
  color: white;
 }

-.App-link {
-  color: #61dafb;
+.App-intro {
+  font-size: large;
+}
+
+.App a {
+  color: #f60;
 }

@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
+  from { transform: rotate(0deg); }
+  to { transform: rotate(360deg); }
 }
--- a/react-ui/src/App.js
+++ b/react-ui/src/App.js
@@ -1,14 +1,19 @@
-import React, { useCallback, useEffect, useState } from 'react';
+import React, { Component } from 'react';
 import logo from './logo.svg';
+import 'whatwg-fetch';
 import './App.css';

-function App() {
-  const [message, setMessage] = useState(null);
-  const [isFetching, setIsFetching] = useState(false);
-  const [url, setUrl] = useState('/api');
+class App extends Component {
+  constructor(props) {
+    super(props);
+    this.state = { 
+      message: null,
+      fetching: true
+    };
+  }

-  const fetchData = useCallback(() => {
-    fetch(url)
+  componentDidMount() {
+    fetch('/api')
      .then(response => {
        if (!response.ok) {
          throw new Error(`status ${response.status}`);
@@ -16,54 +21,39 @@ function App() {
        return response.json();
      })
      .then(json => {
-        setMessage(json.message);
-        setIsFetching(false);
+        this.setState({
+          message: json.message,
+          fetching: false
+        });
      }).catch(e => {
-        setMessage(`API call failed: ${e}`);
-        setIsFetching(false);
+        this.setState({
+          message: `API call failed: ${e}`,
+          fetching: false
+        });
      })
-  }, [url]);
+  }

-  useEffect(() => {
-    setIsFetching(true);
-    fetchData();
-  }, [fetchData]);
-
-  return (
-    <div className="App">
-      <header className="App-header">
-        <img src={logo} className="App-logo" alt="logo" />
-        { process.env.NODE_ENV === 'production' ?
-            <p>
-              This is a production build from create-react-app.
-            </p>
-          : <p>
-              Edit <code>src/App.js</code> and save to reload.
-            </p>
-        }
-        <p>{'« '}<strong>
-          {isFetching
+  render() {
+    return (
+      <div className="App">
+        <div className="App-header">
+          <img src={logo} className="App-logo" alt="logo" />
+          <h2>Welcome to React</h2>
+        </div>
+        <p className="App-intro">
+          {'This is '}
+          <a href="https://github.com/mars/heroku-cra-node">
+            {'create-react-app with a custom Node/Express server'}
+          </a><br/>
+        </p>
+        <p className="App-intro">
+          {this.state.fetching
            ? 'Fetching message from API'
-            : message}
-        </strong>{' »'}</p>
-        <p><a
-          className="App-link"
-          href="https://github.com/mars/heroku-cra-node"
-        >
-          React + Node deployment on Heroku
-        </a></p>
-        <p><a
-          className="App-link"
-          href="https://reactjs.org"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          Learn React
-        </a></p>
-      </header>
-    </div>
-  );
-
+            : this.state.message}
+        </p>
+      </div>
+    );
+  }
 }

 export default App;
--- a/react-ui/src/App.test.js
+++ b/react-ui/src/App.test.js
@@ -5,5 +5,4 @@ import App from './App';
 it('renders without crashing', () => {
  const div = document.createElement('div');
  ReactDOM.render(<App />, div);
-  ReactDOM.unmountComponentAtNode(div);
 });
--- a/react-ui/src/index.css
+++ b/react-ui/src/index.css
@@ -1,18 +1,5 @@
 body {
  margin: 0;
  padding: 0;
-  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
-    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
-    monospace;
-}
-
-p + p {
-  margin-top: 0;
+  font-family: sans-serif;
 }
--- a/react-ui/src/index.js
+++ b/react-ui/src/index.js
@@ -1,12 +1,9 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
 import App from './App';
-import * as serviceWorker from './serviceWorker';
+import './index.css';

-ReactDOM.render(<App />, 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();
+ReactDOM.render(
+  <App />,
+  document.getElementById('root')
+);
--- a/react-ui/src/serviceWorker.js
+++ b/react-ui/src/serviceWorker.js
@@ -1,135 +0,0 @@
-// 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/server/index.js
+++ b/server/index.js
@@ -1,42 +1,14 @@
 const express = require('express');
-const path = require('path');
-const cluster = require('cluster');
-const numCPUs = require('os').cpus().length;
-
-const isDev = process.env.NODE_ENV !== 'production';
+const app = express();
 const PORT = process.env.PORT || 5000;

-// Multi-process to utilize all CPU cores.
-if (!isDev && cluster.isMaster) {
-  console.error(`Node cluster master ${process.pid} is running`);
+app.use(express.static(__dirname + '/../react-ui/build'));

-  // Fork workers.
-  for (let i = 0; i < numCPUs; i++) {
-    cluster.fork();
-  }
+app.get('/api', function (req, res) {
+  res.set('Content-Type', 'application/json');
+  res.send('{"message":"Hello from the custom server!"}');
+});

-  cluster.on('exit', (worker, code, signal) => {
-    console.error(`Node cluster worker ${worker.process.pid} exited: code ${code}, signal ${signal}`);
-  });
-
-} else {
-  const app = express();
-
-  // Priority serve any static files.
-  app.use(express.static(path.resolve(__dirname, '../react-ui/build')));
-
-  // Answer API requests.
-  app.get('/api', function (req, res) {
-    res.set('Content-Type', 'application/json');
-    res.send('{"message":"Hello from the custom server!"}');
-  });
-
-  // All remaining requests return the React app, so it can handle routing.
-  app.get('*', function(request, response) {
-    response.sendFile(path.resolve(__dirname, '../react-ui/build', 'index.html'));
-  });
-
-  app.listen(PORT, function () {
-    console.error(`Node ${isDev ? 'dev server' : 'cluster worker '+process.pid}: listening on port ${PORT}`);
-  });
-}
+app.listen(PORT, function () {
+  console.log(`Listening on port ${PORT}`);
+});