├── public
    ├── favicon.ico
    ├── manifest.json
    └── index.html
├── src
    ├── feedbackMachine.js
    ├── App.e2e.js
    ├── App.test.js
    ├── index.css
    ├── index.js
    ├── App.css
    ├── logo.svg
    ├── App.js
    └── serviceWorker.js
├── jest.config.js
├── jest-puppeteer.config.js
├── package.json
├── LICENSE
├── .gitignore
└── README.md


/public/favicon.ico:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/davidkpiano/mbt-workshop/HEAD/public/favicon.ico


--------------------------------------------------------------------------------
/src/feedbackMachine.js:
--------------------------------------------------------------------------------
1 | import { Machine } from 'xstate';
2 | 
3 | // Write your machine here
4 | 


--------------------------------------------------------------------------------
/jest.config.js:
--------------------------------------------------------------------------------
1 | module.exports = {
2 |   preset: 'jest-puppeteer',
3 |   testRegex: './*\\.e2e\\.js$'
4 | };
5 | 


--------------------------------------------------------------------------------
/src/App.e2e.js:
--------------------------------------------------------------------------------
1 | const { Machine } = require('xstate');
2 | const { createModel } = require('@xstate/test');
3 | 
4 | // Write your E2E tests here
5 | 


--------------------------------------------------------------------------------
/jest-puppeteer.config.js:
--------------------------------------------------------------------------------
 1 | module.exports = {
 2 |   server: {
 3 |     command: `npm start`,
 4 |     port: 3000,
 5 |     launchTimeout: 5000
 6 |   },
 7 |   launch: {
 8 |     headless: false,
 9 |     slowMo: 50
10 |   }
11 | };
12 | 


--------------------------------------------------------------------------------
/src/App.test.js:
--------------------------------------------------------------------------------
1 | import React from 'react';
2 | import Feedback from './App';
3 | import { Machine } from 'xstate';
4 | import { render, fireEvent, cleanup } from '@testing-library/react';
5 | import { assert } from 'chai';
6 | import { createModel } from '../../xstate/packages/xstate-test/lib';
7 | 
8 | // Write your integration tests here
9 | 


--------------------------------------------------------------------------------
/public/manifest.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "short_name": "React App",
 3 |   "name": "Create React App Sample",
 4 |   "icons": [
 5 |     {
 6 |       "src": "favicon.ico",
 7 |       "sizes": "64x64 32x32 24x24 16x16",
 8 |       "type": "image/x-icon"
 9 |     }
10 |   ],
11 |   "start_url": ".",
12 |   "display": "standalone",
13 |   "theme_color": "#000000",
14 |   "background_color": "#ffffff"
15 | }
16 | 


--------------------------------------------------------------------------------
/src/index.css:
--------------------------------------------------------------------------------
 1 | body {
 2 |   margin: 0;
 3 |   padding: 0;
 4 |   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
 5 |     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
 6 |     sans-serif;
 7 |   -webkit-font-smoothing: antialiased;
 8 |   -moz-osx-font-smoothing: grayscale;
 9 |   font-size: 24px;
10 | }
11 | 
12 | code {
13 |   font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
14 |     monospace;
15 | }
16 | 


--------------------------------------------------------------------------------
/src/index.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import ReactDOM from 'react-dom';
 3 | import './index.css';
 4 | import App from './App';
 5 | import * as serviceWorker from './serviceWorker';
 6 | 
 7 | ReactDOM.render(<App />, document.getElementById('root'));
 8 | 
 9 | // If you want your app to work offline and load faster, you can change
10 | // unregister() to register() below. Note this comes with some pitfalls.
11 | // Learn more about service workers: http://bit.ly/CRA-PWA
12 | serviceWorker.unregister();
13 | 


--------------------------------------------------------------------------------
/src/App.css:
--------------------------------------------------------------------------------
 1 | .App {
 2 |   text-align: center;
 3 | }
 4 | 
 5 | .App-logo {
 6 |   animation: App-logo-spin infinite 20s linear;
 7 |   height: 40vmin;
 8 | }
 9 | 
10 | .App-header {
11 |   background-color: #282c34;
12 |   min-height: 100vh;
13 |   display: flex;
14 |   flex-direction: column;
15 |   align-items: center;
16 |   justify-content: center;
17 |   font-size: calc(10px + 2vmin);
18 |   color: white;
19 | }
20 | 
21 | .App-link {
22 |   color: #61dafb;
23 | }
24 | 
25 | @keyframes App-logo-spin {
26 |   from {
27 |     transform: rotate(0deg);
28 |   }
29 |   to {
30 |     transform: rotate(360deg);
31 |   }
32 | }
33 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "feedback",
 3 |   "version": "0.1.0",
 4 |   "private": true,
 5 |   "dependencies": {
 6 |     "@xstate/graph": "0.0.1",
 7 |     "@xstate/react": "^0.1.0",
 8 |     "react": "^16.11.0",
 9 |     "react-dom": "^16.11.0",
10 |     "react-scripts": "^2.1.8",
11 |     "styled-components": "^4.4.1",
12 |     "xstate": "next"
13 |   },
14 |   "scripts": {
15 |     "start": "react-scripts start",
16 |     "build": "react-scripts build",
17 |     "test": "react-scripts test",
18 |     "eject": "react-scripts eject",
19 |     "e2e": "jest -c jest.config.js"
20 |   },
21 |   "eslintConfig": {
22 |     "extends": "react-app"
23 |   },
24 |   "browserslist": [
25 |     ">0.2%",
26 |     "not dead",
27 |     "not ie <= 11",
28 |     "not op_mini all"
29 |   ],
30 |   "devDependencies": {
31 |     "@testing-library/react": "^9.3.1",
32 |     "@xstate/test": "^0.1.0",
33 |     "chai": "^4.2.0",
34 |     "jest": "^24.9.0",
35 |     "jest-puppeteer": "^4.3.0"
36 |   }
37 | }
38 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2019 David Khourshid
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # Logs
 2 | logs
 3 | *.log
 4 | npm-debug.log*
 5 | yarn-debug.log*
 6 | yarn-error.log*
 7 | 
 8 | # Runtime data
 9 | pids
10 | *.pid
11 | *.seed
12 | *.pid.lock
13 | 
14 | # Directory for instrumented libs generated by jscoverage/JSCover
15 | lib-cov
16 | 
17 | # Coverage directory used by tools like istanbul
18 | coverage
19 | 
20 | # nyc test coverage
21 | .nyc_output
22 | 
23 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
24 | .grunt
25 | 
26 | # Bower dependency directory (https://bower.io/)
27 | bower_components
28 | 
29 | # node-waf configuration
30 | .lock-wscript
31 | 
32 | # Compiled binary addons (https://nodejs.org/api/addons.html)
33 | build/Release
34 | 
35 | # Dependency directories
36 | node_modules/
37 | jspm_packages/
38 | 
39 | # TypeScript v1 declaration files
40 | typings/
41 | 
42 | # Optional npm cache directory
43 | .npm
44 | 
45 | # Optional eslint cache
46 | .eslintcache
47 | 
48 | # Optional REPL history
49 | .node_repl_history
50 | 
51 | # Output of 'npm pack'
52 | *.tgz
53 | 
54 | # Yarn Integrity file
55 | .yarn-integrity
56 | 
57 | # dotenv environment variables file
58 | .env
59 | 
60 | # next.js build output
61 | .next
62 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Model-Based Testing with `@xstate/test` and React Workshop
 2 | 
 3 | Welcome to the workshop! To get started, follow these instructions:
 4 | 
 5 | 1. Make sure you have Node and NPM installed.
 6 | 1. Run `npm install` or `yarn install` to install all dependencies.
 7 |    - This is a React project bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
 8 | 1. Run `npm start` to start the app.
 9 | 
10 | ## Goal
11 | 
12 | The goal of this workshop is to demonstrate how to use `@xstate/test` with React to automate the generation of integration and end-to-end (E2E) tests of an example application.
13 | 
14 | ![End-to-end tests for Feedback app being run in a browser with Puppeteer](https://i.imgur.com/W5CaIIP.gif)
15 | 
16 | ## Running the Tests
17 | 
18 | To run the **integration tests**, run `npm test`. This will run the tests found in [`./src/App.test.js`](https://github.com/davidkpiano/xstate-test-demo/blob/master/src/App.test.js).
19 | 
20 | To run the **E2E tests**, run `npm run e2e`. This will run the tests found in [`./src/App.e2e.js`](https://github.com/davidkpiano/xstate-test-demo/blob/master/src/App.test.js).
21 | 
22 | ## Resources
23 | 
24 | - [Github: `@xstate/test`](https://github.com/davidkpiano/xstate/tree/master/packages/xstate-test)
25 | - [Slides: Write Less Tests! From Automation to Autogeneration](https://slides.com/davidkhourshid/mbt/) (React Rally 2019)
26 | - [Article: Model-Based Testing in React with State Machines](https://css-tricks.com/?p=286484) (CSS-Tricks)
27 | 


--------------------------------------------------------------------------------
/public/index.html:
--------------------------------------------------------------------------------
 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 |   <head>
 4 |     <meta charset="utf-8" />
 5 |     <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
 6 |     <meta
 7 |       name="viewport"
 8 |       content="width=device-width, initial-scale=1, shrink-to-fit=no"
 9 |     />
10 |     <meta name="theme-color" content="#000000" />
11 |     <!--
12 |       manifest.json provides metadata used when your web app is added to the
13 |       homescreen on Android. See https://developers.google.com/web/fundamentals/web-app-manifest/
14 |     -->
15 |     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
16 |     <!--
17 |       Notice the use of %PUBLIC_URL% in the tags above.
18 |       It will be replaced with the URL of the `public` folder during the build.
19 |       Only files inside the `public` folder can be referenced from the HTML.
20 | 
21 |       Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
22 |       work correctly both with client-side routing and a non-root public URL.
23 |       Learn how to configure a non-root public URL by running `npm run build`.
24 |     -->
25 |     <title>React App</title>
26 |   </head>
27 |   <body>
28 |     <noscript>You need to enable JavaScript to run this app.</noscript>
29 |     <div id="root"></div>
30 |     <!--
31 |       This HTML file is a template.
32 |       If you open it directly in the browser, you will see an empty page.
33 | 
34 |       You can add webfonts, meta tags, or analytics to this file.
35 |       The build step will place the bundled scripts into the <body> tag.
36 | 
37 |       To begin the development, run `npm start` or `yarn start`.
38 |       To create a production bundle, use `npm run build` or `yarn build`.
39 |     -->
40 |   </body>
41 | </html>
42 | 


--------------------------------------------------------------------------------
/src/logo.svg:
--------------------------------------------------------------------------------
1 | <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
2 |     <g fill="#61DAFB">
3 |         <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"/>
4 |         <circle cx="420.9" cy="296.5" r="45.7"/>
5 |         <path d="M520.5 78.1z"/>
6 |     </g>
7 | </svg>
8 | 


--------------------------------------------------------------------------------
/src/App.js:
--------------------------------------------------------------------------------
  1 | // @ts-check
  2 | 
  3 | import React, { useReducer, useEffect } from 'react';
  4 | import styled from 'styled-components';
  5 | 
  6 | function useKeyDown(key, onKeyDown) {
  7 |   useEffect(() => {
  8 |     const handler = e => {
  9 |       if (e.key === key) {
 10 |         onKeyDown();
 11 |       }
 12 |     };
 13 | 
 14 |     window.addEventListener('keydown', handler);
 15 | 
 16 |     return () => window.removeEventListener('keydown', handler);
 17 |   }, [onKeyDown]);
 18 | }
 19 | 
 20 | const StyledScreen = styled.div`
 21 |   padding: 1rem;
 22 |   padding-top: 2rem;
 23 |   background: white;
 24 |   box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.1);
 25 |   border-radius: 0.5rem;
 26 | 
 27 |   > header {
 28 |     margin-bottom: 1rem;
 29 |   }
 30 | 
 31 |   button {
 32 |     background: #4088da;
 33 |     appearance: none;
 34 |     border: none;
 35 |     text-transform: uppercase;
 36 |     color: white;
 37 |     letter-spacing: 0.5px;
 38 |     font-weight: bold;
 39 |     padding: 0.5rem 1rem;
 40 |     border-radius: 20rem;
 41 |     align-self: flex-end;
 42 |     cursor: pointer;
 43 |     font-size: 0.75rem;
 44 | 
 45 |     + button {
 46 |       margin-left: 0.5rem;
 47 |     }
 48 | 
 49 |     &[data-variant='good'] {
 50 |       background-color: #7cbd67;
 51 |     }
 52 |     &[data-variant='bad'] {
 53 |       background-color: #ff4652;
 54 |     }
 55 |   }
 56 | 
 57 |   textarea {
 58 |     display: block;
 59 |     margin-bottom: 1rem;
 60 |     border: 1px solid #dedede;
 61 |     font-size: 1rem;
 62 |   }
 63 | 
 64 |   [data-testid='close-button'] {
 65 |     position: absolute;
 66 |     top: 0;
 67 |     right: 0;
 68 |     appearance: none;
 69 |     height: 2rem;
 70 |     width: 2rem;
 71 |     line-height: 0;
 72 |     border: none;
 73 |     background: transparent;
 74 |     text-align: center;
 75 |     display: flex;
 76 |     justify-content: center;
 77 |     align-items: center;
 78 | 
 79 |     &:before {
 80 |       content: '×';
 81 |       font-size: 1.5rem;
 82 |       color: rgba(0, 0, 0, 0.5);
 83 |     }
 84 |   }
 85 | `;
 86 | 
 87 | function QuestionScreen({ onClickGood, onClickBad, onClose }) {
 88 |   useKeyDown('Escape', onClose);
 89 | 
 90 |   return (
 91 |     <StyledScreen data-testid="question-screen">
 92 |       <header>How was your experience?</header>
 93 |       <button
 94 |         onClick={onClickGood}
 95 |         data-testid="good-button"
 96 |         data-variant="good"
 97 |       >
 98 |         Good
 99 |       </button>
100 |       <button onClick={onClickBad} data-testid="bad-button" data-variant="bad">
101 |         Bad
102 |       </button>
103 |       <button data-testid="close-button" title="close" onClick={onClose} />
104 |     </StyledScreen>
105 |   );
106 | }
107 | 
108 | function FormScreen({ onSubmit, onClose }) {
109 |   useKeyDown('Escape', onClose);
110 | 
111 |   return (
112 |     <StyledScreen
113 |       as="form"
114 |       data-testid="form-screen"
115 |       onSubmit={e => {
116 |         e.preventDefault();
117 |         const { response } = e.target.elements;
118 | 
119 |         onSubmit({
120 |           value: response
121 |         });
122 |       }}
123 |     >
124 |       <header>Care to tell us why?</header>
125 |       <textarea
126 |         data-testid="response-input"
127 |         name="response"
128 |         placeholder="Complain here"
129 |         onKeyDown={e => {
130 |           if (e.key === 'Escape') {
131 |             e.stopPropagation();
132 |           }
133 |         }}
134 |       />
135 |       <button data-testid="submit-button">Submit</button>
136 |       <button
137 |         data-testid="close-button"
138 |         title="close"
139 |         type="button"
140 |         onClick={onClose}
141 |       />
142 |     </StyledScreen>
143 |   );
144 | }
145 | 
146 | function ThanksScreen({ onClose }) {
147 |   useKeyDown('Escape', onClose);
148 | 
149 |   return (
150 |     <StyledScreen data-testid="thanks-screen">
151 |       <header>Thanks for your feedback.</header>
152 |       <button data-testid="close-button" title="close" onClick={onClose} />
153 |     </StyledScreen>
154 |   );
155 | }
156 | 
157 | function feedbackReducer(state, event) {
158 |   // Write your reducer here
159 | }
160 | 
161 | function Feedback() {
162 |   const [state, dispatch] = useReducer(feedbackReducer, 'question');
163 | 
164 |   switch (state) {
165 |     case 'question':
166 |       return (
167 |         <QuestionScreen
168 |           onClickGood={() => dispatch({ type: 'GOOD' })}
169 |           onClickBad={() => dispatch({ type: 'BAD' })}
170 |           onClose={() => dispatch({ type: 'CLOSE' })}
171 |         />
172 |       );
173 |     case 'form':
174 |       return (
175 |         <FormScreen
176 |           onSubmit={value => dispatch({ type: 'SUBMIT', value })}
177 |           onClose={() => dispatch({ type: 'CLOSE' })}
178 |         />
179 |       );
180 |     case 'thanks':
181 |       return <ThanksScreen onClose={() => dispatch({ type: 'CLOSE' })} />;
182 |     case 'closed':
183 |       return null;
184 |   }
185 | }
186 | 
187 | const StyledApp = styled.main`
188 |   height: 100vh;
189 |   width: 100vw;
190 |   background: #f5f8f9;
191 |   display: flex;
192 |   justify-content: center;
193 |   align-items: center;
194 | 
195 |   &,
196 |   * {
197 |     position: relative;
198 |     box-sizing: border-box;
199 |   }
200 | `;
201 | 
202 | function App() {
203 |   return (
204 |     <StyledApp>
205 |       <Feedback />
206 |     </StyledApp>
207 |   );
208 | }
209 | 
210 | export default App;
211 | 


--------------------------------------------------------------------------------
/src/serviceWorker.js:
--------------------------------------------------------------------------------
  1 | // This optional code is used to register a service worker.
  2 | // register() is not called by default.
  3 | 
  4 | // This lets the app load faster on subsequent visits in production, and gives
  5 | // it offline capabilities. However, it also means that developers (and users)
  6 | // will only see deployed updates on subsequent visits to a page, after all the
  7 | // existing tabs open on the page have been closed, since previously cached
  8 | // resources are updated in the background.
  9 | 
 10 | // To learn more about the benefits of this model and instructions on how to
 11 | // opt-in, read http://bit.ly/CRA-PWA
 12 | 
 13 | const isLocalhost = Boolean(
 14 |   window.location.hostname === 'localhost' ||
 15 |     // [::1] is the IPv6 localhost address.
 16 |     window.location.hostname === '[::1]' ||
 17 |     // 127.0.0.1/8 is considered localhost for IPv4.
 18 |     window.location.hostname.match(
 19 |       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
 20 |     )
 21 | );
 22 | 
 23 | export function register(config) {
 24 |   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
 25 |     // The URL constructor is available in all browsers that support SW.
 26 |     const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
 27 |     if (publicUrl.origin !== window.location.origin) {
 28 |       // Our service worker won't work if PUBLIC_URL is on a different origin
 29 |       // from what our page is served on. This might happen if a CDN is used to
 30 |       // serve assets; see https://github.com/facebook/create-react-app/issues/2374
 31 |       return;
 32 |     }
 33 | 
 34 |     window.addEventListener('load', () => {
 35 |       const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
 36 | 
 37 |       if (isLocalhost) {
 38 |         // This is running on localhost. Let's check if a service worker still exists or not.
 39 |         checkValidServiceWorker(swUrl, config);
 40 | 
 41 |         // Add some additional logging to localhost, pointing developers to the
 42 |         // service worker/PWA documentation.
 43 |         navigator.serviceWorker.ready.then(() => {
 44 |           console.log(
 45 |             'This web app is being served cache-first by a service ' +
 46 |               'worker. To learn more, visit http://bit.ly/CRA-PWA'
 47 |           );
 48 |         });
 49 |       } else {
 50 |         // Is not localhost. Just register service worker
 51 |         registerValidSW(swUrl, config);
 52 |       }
 53 |     });
 54 |   }
 55 | }
 56 | 
 57 | function registerValidSW(swUrl, config) {
 58 |   navigator.serviceWorker
 59 |     .register(swUrl)
 60 |     .then(registration => {
 61 |       registration.onupdatefound = () => {
 62 |         const installingWorker = registration.installing;
 63 |         if (installingWorker == null) {
 64 |           return;
 65 |         }
 66 |         installingWorker.onstatechange = () => {
 67 |           if (installingWorker.state === 'installed') {
 68 |             if (navigator.serviceWorker.controller) {
 69 |               // At this point, the updated precached content has been fetched,
 70 |               // but the previous service worker will still serve the older
 71 |               // content until all client tabs are closed.
 72 |               console.log(
 73 |                 'New content is available and will be used when all ' +
 74 |                   'tabs for this page are closed. See http://bit.ly/CRA-PWA.'
 75 |               );
 76 | 
 77 |               // Execute callback
 78 |               if (config && config.onUpdate) {
 79 |                 config.onUpdate(registration);
 80 |               }
 81 |             } else {
 82 |               // At this point, everything has been precached.
 83 |               // It's the perfect time to display a
 84 |               // "Content is cached for offline use." message.
 85 |               console.log('Content is cached for offline use.');
 86 | 
 87 |               // Execute callback
 88 |               if (config && config.onSuccess) {
 89 |                 config.onSuccess(registration);
 90 |               }
 91 |             }
 92 |           }
 93 |         };
 94 |       };
 95 |     })
 96 |     .catch(error => {
 97 |       console.error('Error during service worker registration:', error);
 98 |     });
 99 | }
100 | 
101 | function checkValidServiceWorker(swUrl, config) {
102 |   // Check if the service worker can be found. If it can't reload the page.
103 |   fetch(swUrl)
104 |     .then(response => {
105 |       // Ensure service worker exists, and that we really are getting a JS file.
106 |       const contentType = response.headers.get('content-type');
107 |       if (
108 |         response.status === 404 ||
109 |         (contentType != null && contentType.indexOf('javascript') === -1)
110 |       ) {
111 |         // No service worker found. Probably a different app. Reload the page.
112 |         navigator.serviceWorker.ready.then(registration => {
113 |           registration.unregister().then(() => {
114 |             window.location.reload();
115 |           });
116 |         });
117 |       } else {
118 |         // Service worker found. Proceed as normal.
119 |         registerValidSW(swUrl, config);
120 |       }
121 |     })
122 |     .catch(() => {
123 |       console.log(
124 |         'No internet connection found. App is running in offline mode.'
125 |       );
126 |     });
127 | }
128 | 
129 | export function unregister() {
130 |   if ('serviceWorker' in navigator) {
131 |     navigator.serviceWorker.ready.then(registration => {
132 |       registration.unregister();
133 |     });
134 |   }
135 | }
136 | 


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