Restructuring

Correct quoting in sample command
Remove no-longer-needed install of devDependencies (#36 )
2020-03-13 19:19:46 +05:30 · 2019-11-19 05:33:10 -08:00 · 2019-07-09 09:17:46 -07:00 · 2019-04-15 15:25:01 -07:00 · 2019-04-01 16:20:09 -07:00 · 2019-04-01 15:47:41 -07:00
20 changed files with 11831 additions and 8495 deletions
--- a/README.md
+++ b/README.md
@@ -1,14 +1,17 @@
 # create-react-app with a Node server on Heroku

-[![Greenkeeper badge](https://badges.greenkeeper.io/mars/heroku-cra-node.svg)](https://greenkeeper.io/)
-
 A minimal example of using a Node backend (server for API, proxy, & routing) with a [React frontend](https://github.com/facebookincubator/create-react-app).

+* 📐 [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  
 ▶️ [create-react-app-buildpack](https://github.com/mars/create-react-app-buildpack)

-⤵️ [Switching from create-react-app-buildpack](#switching-from-create-react-app-buildpack)?
-

 ## Design Points

@@ -18,9 +21,8 @@ A combo of two npm projects, the backend server and the frontend UI. So there ar
      * [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)
      * generated by [create-react-app](https://github.com/facebookincubator/create-react-app)
-      * deployed via build hooks in the Node server's [`./package.json`](package.json)
-        * module cache configured by `cacheDirectories`
-        * bundling via `heroku-postbuild` hook
+      * 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.

@@ -43,7 +45,7 @@ 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
-    * `heroku-postbuild` for create-react-app
+    * `npm run build` for 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
@@ -81,7 +83,33 @@ If an app was previously deployed with [create-react-app-buildpack](https://gith
    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

--- a/greenkeeper.json
+++ b/greenkeeper.json
@@ -1,10 +0,0 @@
-{
-  "groups": {
-    "default": {
-      "packages": [
-        "package.json",
-        "react-ui/package.json"
-      ]
-    }
-  }
-}
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,448 +1,433 @@
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+      "requires": {
+        "load-json-file": "^4.0.0",
+        "normalize-package-data": "^2.3.2",
+        "path-type": "^3.0.0"
+      }
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+      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.15.1.tgz",
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+      "requires": {
+        "path-parse": "^1.0.6"
+      }
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+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+      "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ=="
+    },
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+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
+      "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=",
+      "requires": {
+        "shebang-regex": "^1.0.0"
+      }
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+    "shebang-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
+      "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM="
+    },
+    "shell-quote": {
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.7.2.tgz",
+      "integrity": "sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg=="
+    },
+    "spdx-correct": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
+      "integrity": "sha512-lr2EZCctC2BNR7j7WzJ2FpDznxky1sjfxvvYEyzxNyb6lZXHODmEoJeFu4JupYlkfha1KZpJyoqiJ7pgA1qq8Q==",
+      "requires": {
+        "spdx-expression-parse": "^3.0.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "spdx-exceptions": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz",
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+    },
+    "spdx-expression-parse": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
+      "integrity": "sha512-Yg6D3XpRD4kkOmTpdgbUiEJFKghJH03fiC1OPll5h/0sO6neh2jqRDVHOQ4o/LMea0tgCkbMgea5ip/e+MkWyg==",
+      "requires": {
+        "spdx-exceptions": "^2.1.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "spdx-license-ids": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
+      "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q=="
+    },
+    "string.prototype.padend": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/string.prototype.padend/-/string.prototype.padend-3.1.0.tgz",
+      "integrity": "sha512-3aIv8Ffdp8EZj8iLwREGpQaUZiPyrWrpzMBHvkiSW/bK/EGve9np07Vwy7IJ5waydpGXzQZu/F8Oze2/IWkBaA==",
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.0-next.1"
+      }
+    },
+    "string.prototype.trimleft": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.1.tgz",
+      "integrity": "sha512-iu2AGd3PuP5Rp7x2kEZCrB2Nf41ehzh+goo8TV7z8/XDBbsvc6HQIlUl9RjkZ4oyrW1XM5UwlGl1oVEaDjg6Ag==",
+      "requires": {
+        "define-properties": "^1.1.3",
+        "function-bind": "^1.1.1"
+      }
+    },
+    "string.prototype.trimright": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.1.tgz",
+      "integrity": "sha512-qFvWL3/+QIgZXVmJBfpHmxLB7xsUXz6HsUmP8+5dRaC3Q7oKUv9Vo6aMCRZC1smrtyECFsIT30PqBJ1gTjAs+g==",
+      "requires": {
+        "define-properties": "^1.1.3",
+        "function-bind": "^1.1.1"
+      }
+    },
+    "strip-bom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM="
+    },
+    "supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "requires": {
+        "has-flag": "^3.0.0"
+      }
+    },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "requires": {
+        "isexe": "^2.0.0"
+      }
    }
  }
 }
--- a/package.json
+++ b/package.json
@@ -1,24 +1,30 @@
 {
  "name": "heroku-cra-node",
-  "version": "1.0.0",
+  "version": "3.0.0",
  "description": "How to use create-react-app with a custom Node API on Heroku",
  "engines": {
-    "node": "8.9.x"
+    "node": "10.x"
  },
  "scripts": {
-    "start": "node server",
-    "heroku-postbuild": "cd react-ui/ && npm install && npm install --only=dev --no-shrinkwrap && npm run build"
+    "install": "run-p clientinstall serverinstall",
+    "clientinstall": "cd react-ui && npm install",
+    "serverinstall": "cd server && npm install",
+    "start": "run-p clientstart serverstart",
+    "clientstart": "cd react-ui && npm start",
+    "serverstart": "cd server && npm start",
+    "build": "cd react-ui && npm install && npm run build"
  },
  "cacheDirectories": [
    "node_modules",
+    "server/node_modules",
    "react-ui/node_modules"
  ],
  "dependencies": {
-    "express": "^4.16.3"
+    "npm-run-all": "^4.1.5"
  },
  "repository": {
    "type": "git",
-    "url": "https://github.com/mars/heroku-cra-node.git"
+    "url": "https://github.com/mohiit1502/heroku-cra-node.git"
  },
  "keywords": [
    "node",
--- a/react-ui/.gitignore
+++ b/react-ui/.gitignore
@@ -1,15 +1,23 @@
-# See http://help.github.com/ignore-files/ for more about ignoring files.
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.

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

 # testing
-coverage
+/coverage

 # production
-build
+/build

 # misc
 .DS_Store
-.env
-npm-debug.log
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.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
@@ -1,19 +1,26 @@
 {
-  "name": "react-ui",
+  "name": "heroku-cra-node-client",
  "version": "0.1.0",
  "private": true,
-  "devDependencies": {
-    "react-scripts": "^1.1.4"
-  },
  "dependencies": {
-    "react": "^16.4.1",
-    "react-dom": "^16.4.1"
+    "react": "^16.8.6",
+    "react-dom": "^16.8.6",
+    "react-scripts": "^2.1.8"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
-    "test": "react-scripts test --env=jsdom",
+    "test": "react-scripts test",
    "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
@@ -1,11 +1,17 @@
-<!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">
    <!--
-      Notice the use of %PUBLIC_URL% in the tag above.
+      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.

@@ -16,6 +22,9 @@
    <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.
@@ -24,8 +33,8 @@
      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`.
-      To create a production bundle, use `npm run build`.
+      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/react-ui/public/manifest.json
+++ b/react-ui/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/react-ui/src/App.css
+++ b/react-ui/src/App.css
@@ -4,25 +4,29 @@

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

 .App-header {
-  background-color: #222;
-  height: 150px;
-  padding: 20px;
+  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-intro {
-  font-size: large;
-}
-
-.App a {
-  color: #f60;
+.App-link {
+  color: #61dafb;
 }

@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
@@ -1,18 +1,14 @@
-import React, { Component } from 'react';
+import React, { useCallback, useEffect, useState } from 'react';
 import logo from './logo.svg';
 import './App.css';

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

-  componentDidMount() {
-    fetch('/api')
+  const fetchData = useCallback(() => {
+    fetch(url)
      .then(response => {
        if (!response.ok) {
          throw new Error(`status ${response.status}`);
@@ -20,39 +16,54 @@ class App extends Component {
        return response.json();
      })
      .then(json => {
-        this.setState({
-          message: json.message,
-          fetching: false
-        });
+        setMessage(json.message);
+        setIsFetching(false);
      }).catch(e => {
-        this.setState({
-          message: `API call failed: ${e}`,
-          fetching: false
-        });
+        setMessage(`API call failed: ${e}`);
+        setIsFetching(false);
      })
-  }
+  }, [url]);

-  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
+  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
            ? 'Fetching message from API'
-            : this.state.message}
-        </p>
-      </div>
-    );
-  }
+            : 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>
+  );
+
 }

 export default App;
--- a/react-ui/src/App.test.js
+++ b/react-ui/src/App.test.js
@@ -5,4 +5,5 @@ 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
@@ -1,5 +1,18 @@
 body {
  margin: 0;
  padding: 0;
-  font-family: sans-serif;
+  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;
 }
--- a/react-ui/src/index.js
+++ b/react-ui/src/index.js
@@ -1,9 +1,12 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import App from './App';
 import './index.css';
+import App from './App';
+import * as serviceWorker from './serviceWorker';

-ReactDOM.render(
-  <App />,
-  document.getElementById('root')
-);
+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();
--- a/react-ui/src/serviceWorker.js
+++ b/react-ui/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/server/index.js
+++ b/server/index.js
@@ -2,11 +2,13 @@ const express = require('express');
 const path = require('path');
 const cluster = require('cluster');
 const numCPUs = require('os').cpus().length;
-
+const dotenv = require('dotenv');
+dotenv.config();
+const isDev = process.env.NODE_ENV !== 'production';
 const PORT = process.env.PORT || 5000;

 // Multi-process to utilize all CPU cores.
-if (cluster.isMaster) {
+if (!isDev && cluster.isMaster) {
  console.error(`Node cluster master ${process.pid} is running`);

  // Fork workers.
@@ -36,6 +38,6 @@ if (cluster.isMaster) {
  });

  app.listen(PORT, function () {
-    console.error(`Node cluster worker ${process.pid}: listening on port ${PORT}`);
+    console.error(`Node ${isDev ? 'dev server' : 'cluster worker '+process.pid}: listening on port ${PORT}`);
  });
 }
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -0,0 +1,379 @@
+{
+  "name": "heroku-cra-node-server",
+  "version": "3.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
+    },
+    "body-parser": {
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
+      "requires": {
+        "bytes": "3.1.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      }
+    },
+    "bytes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
+      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
+    },
+    "content-disposition": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
+      "integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "content-type": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
+      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
+    },
+    "cookie": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.0.tgz",
+      "integrity": "sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg=="
+    },
+    "cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
+    },
+    "debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "depd": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
+    },
+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
+    },
+    "dotenv": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-8.2.0.tgz",
+      "integrity": "sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw=="
+    },
+    "ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
+    },
+    "encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
+    },
+    "escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
+      "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
+    },
+    "etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
+      "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
+    },
+    "express": {
+      "version": "4.17.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.17.1.tgz",
+      "integrity": "sha512-mHJ9O79RqluphRrcw2X/GTh3k9tVv8YcoyY4Kkh4WDMUYKRZUq0h1o0w2rrrxBqM7VoeUVqgb27xlEMXTnYt4g==",
+      "requires": {
+        "accepts": "~1.3.7",
+        "array-flatten": "1.1.1",
+        "body-parser": "1.19.0",
+        "content-disposition": "0.5.3",
+        "content-type": "~1.0.4",
+        "cookie": "0.4.0",
+        "cookie-signature": "1.0.6",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "finalhandler": "~1.1.2",
+        "fresh": "0.5.2",
+        "merge-descriptors": "1.0.1",
+        "methods": "~1.1.2",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.3",
+        "path-to-regexp": "0.1.7",
+        "proxy-addr": "~2.0.5",
+        "qs": "6.7.0",
+        "range-parser": "~1.2.1",
+        "safe-buffer": "5.1.2",
+        "send": "0.17.1",
+        "serve-static": "1.14.1",
+        "setprototypeof": "1.1.1",
+        "statuses": "~1.5.0",
+        "type-is": "~1.6.18",
+        "utils-merge": "1.0.1",
+        "vary": "~1.1.2"
+      }
+    },
+    "finalhandler": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
+      "integrity": "sha512-aAWcW57uxVNrQZqFXjITpW3sIUQmHGG3qSb9mUah9MgMC4NeWhNOlNjXEYq3HjRAvL6arUviZGGJsBg6z0zsWA==",
+      "requires": {
+        "debug": "2.6.9",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.3",
+        "statuses": "~1.5.0",
+        "unpipe": "~1.0.0"
+      }
+    },
+    "forwarded": {
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+      "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
+      "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ="
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+      }
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+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
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+      "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.1.tgz",
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+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    }
+  }
+}
--- a/server/package.json
+++ b/server/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "heroku-cra-node-server",
+  "version": "3.0.0",
+  "description": "How to use create-react-app with a custom Node API on Heroku",
+  "engines": {
+    "node": "10.x"
+  },
+  "scripts": {
+    "start": "node .",
+    "build": "cd react-ui/ && npm install && npm run build"
+  },
+  "dependencies": {
+    "dotenv": "^8.2.0",
+    "express": "^4.16.4"
+  },
+  "license": "MIT",
+  "devDependencies": {}
+}
Author	SHA1	Message	Date
vaasu	c3268344c3	Restructuring	2020-03-13 19:19:46 +05:30
Mars Hall	c414a25250	Correct quoting in sample command	2019-11-19 05:33:10 -08:00
Mars Hall	450b131035	Remove no-longer-needed install of devDependencies (#36 )	2019-07-09 09:17:46 -07:00
Mars Hall	c800477a1b	📚 using Runtime Configuration from create-react-app-buildpack	2019-04-15 15:25:01 -07:00
Mars Hall	b65b1b2a2a	Switch to React functional component w/ hooks	2019-04-01 16:20:09 -07:00
Mars Hall	d0478f2723	Upgrade to React 16.8	2019-04-01 15:47:41 -07:00
Mars Hall	23cddeae9c	Upgrade to React 16.8	2019-04-01 15:45:43 -07:00
Mars Hall	09e155d625	Switch to Heroku Node.js auto-build	2019-04-01 15:37:45 -07:00
Mars Hall	440b1b2d29	Upgrade to react-dom@16.4.2 to mitigate security issue	2019-01-04 11:48:23 -08:00
Mars Hall	21e4a7bda2	Upgrade to react-scripts@2.1.2 to mitigate security issue	2019-01-04 10:02:54 -08:00
Mars Hall	65fd0a393b	Re-implement Node API example in React app	2018-12-16 11:57:34 -08:00
Mars Hall	d261bdfb76	Improve dev vs production distinctions	2018-12-16 11:35:55 -08:00
Mars Hall	8e0f4d44c6	Upgrade to Express 4.16.4 & Heroku deployment Node version to 10.x	2018-12-16 10:55:44 -08:00
Mars Hall	1afb09546e	Upgrade to Create React App 2.1.1 & React 16.6.3	2018-12-16 10:51:40 -08:00