adding demo app to repo

README.md

@@ -4,9 +4,7 @@ This package provides a single react component.
 
 The component contains an input field with a drop down menu to pick a possible option based on the current input as a react component.
 
-Following features describe and might distinguish the component from other npm packages that offer a similar react component:
-
-Have a look at [w3schools.com](https://www.w3schools.com/howto/howto_js_autocomplete.asp) to see how you can do the same thing with pure html, css, and js.
+Have a look at [w3schools.com](https://www.w3schools.com/howto/howto_js_autocomplete.asp) to see how you can do something similar with pure html, css, and js.
 
 For more information about react and the ecosystem see this [guide](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md).
 

src/DataListInput.jsx

@@ -59,7 +59,7 @@ class DataListInput extends React.Component {
             const targetInInput = input[i].contains( event.target );
             if ( targetIsInput || targetInInput ) return;
         }
-        
+
         // do not close menu if user clicked inside
         for( let i = 0; i < menu.length; i+=1 ) {
             const targetInMenu = menu[ i ].contains( event.target );
@@ -92,7 +92,7 @@ class DataListInput extends React.Component {
                 return this.match( currentInput, item );
             } );
 
-            const currentInputIsLastItem = 
+            const currentInputIsLastItem =
                 !clearInputOnSelect && lastValidItem && lastValidItem.label === currentInput;
             const displayableItems = matchingItems.length && !currentInputIsLastItem
                 ? matchingItems.slice( 0, dropDownLength ) : items.slice( 0, dropDownLength );
@@ -125,12 +125,12 @@ class DataListInput extends React.Component {
                 visible: true,
             } );
         } else {
-            this.setState( { 
+            this.setState( {
                 currentInput,
                 matchingItems: displayableItems,
                 visible: false,
                 focusIndex: -1,
-            } ) 
+            } )
         }
     };
 
@@ -296,6 +296,7 @@ class DataListInput extends React.Component {
     )
 
     render() {
+        console.log( "we are here");
         const {
             currentInput, matchingItems, focusIndex, visible,
         } = this.state;

testing/demo-app/.gitignore

@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

testing/demo-app/README.md

@@ -0,0 +1,68 @@
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.<br>
+Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+
+The page will reload if you make edits.<br>
+You will also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.<br>
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.<br>
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.<br>
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can’t go back!**
+
+If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
+
+You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting
+
+### Analyzing the Bundle Size
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size
+
+### Making a Progressive Web App
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app
+
+### Advanced Configuration
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration
+
+### Deployment
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/deployment
+
+### `npm run build` fails to minify
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify

testing/demo-app/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "my-app",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "react": "^16.9.0",
+    "react-dom": "^16.9.0",
+    "react-scripts": "3.1.1"
+  },
+  "scripts": {
+    "start": "SKIP_PREFLIGHT_CHECK=true react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}

testing/demo-app/public/index.html

@@ -0,0 +1,43 @@
+<!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" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. 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>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.
+      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>

testing/demo-app/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }	    
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

testing/demo-app/public/robots.txt

@@ -0,0 +1,2 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *

testing/demo-app/src/App.css

@@ -0,0 +1,33 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  animation: App-logo-spin infinite 20s linear;
+  height: 40vmin;
+  pointer-events: none;
+}
+
+.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);
+  }
+}

testing/demo-app/src/App.js

@@ -0,0 +1,49 @@
+import React, { useState } from 'react';
+
+import logo from './logo.svg';
+import './App.css';
+
+import DataListInput from './DataListInput';
+
+const data = [
+  {
+    key: 0,
+    label: 'Apple',
+  },
+  {
+    key: 1,
+    label: 'Mango',
+  },
+  {
+    key: 2,
+    label: 'Potatoe',
+  },
+]
+
+function App() {
+  const [ item, setItem ] = useState();
+
+  return (
+    <div className="App">
+      <header className="App-header">
+        <img src={logo} className="App-logo" alt="logo" />
+        <div>
+        {
+          item && (
+          <div>
+            Current Item: { item.label }
+          </div>
+          )
+        }
+
+        <DataListInput
+          items={data}
+          onSelect={ ( i ) => setItem( i )}
+        />
+      </div>
+      </header>
+    </div>
+  );
+}
+
+export default App;

testing/demo-app/src/App.test.js

@@ -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);
+});

testing/demo-app/src/DataListInput.css

@@ -0,0 +1,47 @@
+.datalist-input {
+    /*the container must be positioned relative:*/
+    position: relative;
+    display: inline-block;
+    width: 100%;
+    height: 100%;
+}
+.datalist-input .autocomplete-input {
+    width: 100%;
+}
+
+.datalist-input .datalist-items {
+    position: absolute;
+    z-index: 99;
+    /*position the autocomplete items to be the same width as the container:*/
+    top: 100%;
+    left: 0;
+    right: 0;
+}
+
+.datalist-input .default-datalist-items {
+    border: 1px solid #d4d4d4;
+    border-bottom: none;
+    border-top: none;
+}
+
+.datalist-input .default-datalist-items div:not(.datalist-active-item) {
+    padding: 10px;
+    cursor: pointer;
+    background-color: #fff;
+    border-bottom: 1px solid #d4d4d4;
+}
+.datalist-input .default-datalist-items div:not(.datalist-active-item):hover {
+    /*when hovering an item:*/
+    background-color: #e9e9e9;
+}
+.datalist-input .datalist-active-item {
+    /*when navigating through the items using the arrow keys:*/
+    cursor: pointer;
+}
+
+.datalist-input .datalist-active-item-default {
+    background-color: DodgerBlue;
+    color: #ffffff;
+    border-bottom: 1px solid #d4d4d4;
+    padding: 10px;
+}

testing/demo-app/src/DataListInput.jsx

@@ -0,0 +1,357 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+import './DataListInput.css';
+
+class DataListInput extends React.Component {
+    constructor( props ) {
+        super( props );
+
+        const { initialValue } = this.props;
+
+        this.state = {
+            /*  last valid item that was selected from the drop down menu */
+            lastValidItem: undefined,
+            /* current input text */
+            currentInput: initialValue,
+            /* current set of matching items */
+            matchingItems: [],
+            /* visibility property of the drop down menu */
+            visible: false,
+            /* index of the currently focused item in the drop down menu */
+            focusIndex: 0,
+            /* cleaner click events */
+            interactionHappened: false,
+        };
+
+        window.addEventListener( 'click', this.onClickCloseMenu, false );
+    }
+
+    componentDidUpdate = () => {
+        const { currentInput, visible } = this.state;
+        const { initialValue } = this.props;
+
+        // if we have an initialValue, we want to reset it everytime we update and are empty
+        // also setting a new initialValue will trigger this
+        if ( !currentInput && initialValue && !visible ) {
+            this.setState( { currentInput: initialValue } );
+        }
+    }
+
+    componentWillUnmount = ()  => {
+        window.removeEventListener( 'click', this.onClickCloseMenu );
+    }
+
+    onClickCloseMenu = ( event ) => {
+        const menu = document.getElementsByClassName( 'datalist-items' );
+        if ( !menu || !menu.length ) return;
+        // if rerender, items inside might change, allow one click without further checking
+        const { interactionHappened } = this.state;
+        if ( interactionHappened ) {
+            this.setState( { interactionHappened: false } );
+            return;
+        }
+        // do not do anything if input is clicked, as we have a dedicated func for that
+        const input = document.getElementsByClassName( 'autocomplete-input' );
+        if( !input ) return;
+        for( let i = 0; i < input.length; i+=1 ) {
+            const targetIsInput = event.target === input[i];
+            const targetInInput = input[i].contains( event.target );
+            if ( targetIsInput || targetInInput ) return;
+        }
+
+        // do not close menu if user clicked inside
+        for( let i = 0; i < menu.length; i+=1 ) {
+            const targetInMenu = menu[ i ].contains( event.target );
+            const targetIsMenu = event.target === menu[ i ];
+            if ( targetInMenu || targetIsMenu ) return;
+        }
+        const { visible } = this.state;
+        if ( visible ) {
+            this.setState( { visible: false, focusIndex: -1 } );
+        }
+    }
+
+    onClickInput = () => {
+        const { visible, lastValidItem } = this.state;
+        let { currentInput } = this.state;
+        const { requiredInputLength, dropDownLength, items, match, clearInputOnSelect, initialValue } = this.props;
+        const reachedRequiredLength = currentInput.length >= requiredInputLength;
+
+        // if user clicks on input field with initialValue,
+        // the user most likely wants to clear the input field
+        if ( initialValue && currentInput === initialValue ) {
+            this.setState( { currentInput: '' } );
+            currentInput = '';
+        }
+
+        if ( reachedRequiredLength && !visible ) {
+
+            const matchingItems = items.filter( ( item ) => {
+                if ( typeof ( match ) === typeof ( Function ) ) { return match( currentInput, item ); }
+                return this.match( currentInput, item );
+            } );
+
+            const currentInputIsLastItem =
+                !clearInputOnSelect && lastValidItem && lastValidItem.label === currentInput;
+            const displayableItems = matchingItems.length && !currentInputIsLastItem
+                ? matchingItems.slice( 0, dropDownLength ) : items.slice( 0, dropDownLength );
+
+            let index = lastValidItem && !clearInputOnSelect
+                ? this.indexOfItem( lastValidItem, displayableItems ) : 0;
+            index = index > 0 ? index : 0;
+
+            this.setState( { visible: true, matchingItems: displayableItems, focusIndex: index, } );
+        }
+    }
+
+    /**
+     * gets called when someone starts to write in the input field
+     * @param value
+     */
+    onHandleInput = ( event ) => {
+        const currentInput = event.target.value;
+        const { items, match, dropDownLength } = this.props;
+        const matchingItems = items.filter( ( item ) => {
+            if ( typeof ( match ) === typeof ( Function ) ) { return match( currentInput, item ); }
+            return this.match( currentInput, item );
+        } );
+        const displayableItems = matchingItems.slice( 0, dropDownLength );
+        if( matchingItems.length > 0) {
+            this.setState( {
+                currentInput,
+                matchingItems: displayableItems,
+                focusIndex: 0,
+                visible: true,
+            } );
+        } else {
+            this.setState( {
+                currentInput,
+                matchingItems: displayableItems,
+                visible: false,
+                focusIndex: -1,
+            } )
+        }
+    };
+
+    /**
+     * default function for matching the current input value (needle)
+     * and the values of the items array
+     * @param currentInput
+     * @param item
+     * @returns {boolean}
+     */
+    match = ( currentInput, item ) => item
+        .label.substr( 0, currentInput.length ).toUpperCase() === currentInput.toUpperCase();
+
+    /**
+     * function for getting the index of the currentValue inside a value of the values array
+     * @param currentInput
+     * @param item
+     * @returns {number}
+     */
+    indexOfMatch = ( currentInput, item ) => item
+        .label.toUpperCase().indexOf( currentInput.toUpperCase() );
+
+    indexOfItem = ( item, items ) => items.indexOf( items.find( i => i.key === item.key ) )
+
+    /**
+     * handle key events
+     * @param event
+     */
+    onHandleKeydown = ( event ) => {
+        const { visible, focusIndex, matchingItems } = this.state;
+        // only do something if drop-down div is visible
+        if ( !visible ) return;
+        let currentFocusIndex = focusIndex;
+        if ( event.keyCode === 40 || event.keyCode === 9 ) {
+            // If the arrow DOWN key or tab is pressed increase the currentFocus variable:
+            currentFocusIndex += 1;
+            if ( currentFocusIndex >= matchingItems.length ) currentFocusIndex = 0;
+            this.setState( {
+                focusIndex: currentFocusIndex,
+            } );
+            // prevent tab to jump to the next input field if drop down is still open
+            event.preventDefault();
+        } else if ( event.keyCode === 38 ) {
+            // If the arrow UP key is pressed, decrease the currentFocus variable:
+            currentFocusIndex -= 1;
+            if ( currentFocusIndex <= -1 ) currentFocusIndex = matchingItems.length - 1;
+            this.setState( {
+                focusIndex: currentFocusIndex,
+            } );
+        } else if ( event.keyCode === 13 ) {
+            // Enter pressed, similar to onClickItem
+            if ( focusIndex > -1 ) {
+                // Simulate a click on the "active" item:
+                const selectedItem = matchingItems[ currentFocusIndex ];
+                this.onSelect( selectedItem );
+            }
+        }
+    };
+
+    /**
+     * onClickItem gets called when onClick happens on one of the list elements
+     * @param event
+     */
+    onClickItem = ( event ) => {
+        const { matchingItems } = this.state;
+        // update the input value and close the dropdown again
+        const elements = event.currentTarget.children;
+        let selectedKey;
+        for ( let i = 0; i < elements.length; i += 1 ) {
+            if ( elements[ i ].tagName === 'INPUT' ) {
+                selectedKey = elements[ i ].value;
+                break;
+            }
+        }
+        const selectedItem = matchingItems.find( item => item.key === selectedKey );
+        this.onSelect( selectedItem );
+    };
+
+    /**
+     * onSelect is called onClickItem and onEnter upon an option of the drop down menu
+     * does nothing if the key has not changed since the last onSelect event
+     * @param selectedItem
+     */
+    onSelect = ( selectedItem ) => {
+        const { suppressReselect, clearInputOnSelect } = this.props;
+        const { lastValidItem } = this.state;
+        if ( suppressReselect && lastValidItem && selectedItem.key === lastValidItem.key ) {
+            // do not trigger the callback function
+            // but still change state to fit new selection
+            this.setState( {
+                currentInput: clearInputOnSelect ? '' : selectedItem.label,
+                visible: false,
+                focusIndex: -1,
+                interactionHappened: true,
+            } );
+            return;
+        }
+        // change state to fit new selection
+        this.setState( {
+            currentInput: clearInputOnSelect ? '' : selectedItem.label,
+            lastValidItem: selectedItem,
+            visible: false,
+            focusIndex: -1,
+            interactionHappened: true,
+        } );
+        // callback function onSelect
+        const { onSelect } = this.props;
+        onSelect( selectedItem );
+    };
+
+    renderMatchingLabel = ( currentInput, item, indexOfMatch ) => (
+        <React.Fragment>
+            {item.label.substr( 0, indexOfMatch ) }
+            <strong>
+                { item.label.substr( indexOfMatch, currentInput.length ) }
+            </strong>
+            { item.label.substr( currentInput.length, item.label.length ) }
+        </React.Fragment>
+    );
+
+    renderItemLabel = ( currentInput, item, indexOfMatch ) => (
+        <React.Fragment>
+            { indexOfMatch >= 0 && currentInput.length
+                ? this.renderMatchingLabel( currentInput, item, indexOfMatch )
+                : item.label }
+        </React.Fragment>
+    )
+
+    renderItems = ( currentInput, items, focusIndex, activeItemClassName, itemClassName, dropdownClassName ) => (
+        <div className={`datalist-items ${dropdownClassName || 'default-datalist-items'}`}>
+            {items.map( ( item, i ) => {
+                const isActive = focusIndex === i;
+                const itemActiveClasses = isActive ?
+                    `datalist-active-item ${ activeItemClassName || 'datalist-active-item-default' }` : '';
+                const itemClasses = `${ itemClassName } ${ itemActiveClasses }`;
+                return (
+                    <div
+                        onClick={this.onClickItem}
+                        className={itemClasses}
+                        key={item.key}
+                        tabIndex={0}
+                        role="button"
+                        onKeyUp={event => event.preventDefault()}
+                    >
+                        {this.renderItemLabel( currentInput, item, this.indexOfMatch( currentInput, item ) )}
+                        <input type="hidden" value={item.key} readOnly />
+                    </div>
+                );
+            } )}
+        </div>
+    );
+
+    renderInputField = ( placeholder, currentInput, inputClassName ) => (
+        <input
+            onChange={this.onHandleInput}
+            onClick={ this.onClickInput }
+            onKeyDown={this.onHandleKeydown}
+            type="text"
+            className={`autocomplete-input ${ inputClassName }`}
+            placeholder={placeholder}
+            value={currentInput}
+        />
+    )
+
+    render() {
+        const {
+            currentInput, matchingItems, focusIndex, visible,
+        } = this.state;
+        const {
+            placeholder, inputClassName, activeItemClassName,
+            itemClassName, requiredInputLength, dropdownClassName
+        } = this.props;
+        const reachedRequiredLength = currentInput.length >= requiredInputLength;
+        return (
+            <div className="datalist-input">
+                { this.renderInputField( placeholder, currentInput, inputClassName ) }
+                { reachedRequiredLength && visible
+                    && this.renderItems( currentInput, matchingItems, focusIndex,
+                        activeItemClassName, itemClassName, dropdownClassName )
+                }
+            </div>
+        );
+    }
+}
+
+DataListInput.propTypes = {
+    items: PropTypes.arrayOf(
+        PropTypes.shape( {
+            label: PropTypes.string.isRequired,
+            key: PropTypes.oneOfType( [
+                PropTypes.string,
+                PropTypes.number,
+            ] ).isRequired,
+        } ),
+    ).isRequired,
+    placeholder: PropTypes.string,
+    onSelect: PropTypes.func.isRequired,
+    match: PropTypes.func,
+    inputClassName: PropTypes.string,
+    dropdownClassName: PropTypes.string,
+    itemClassName: PropTypes.string,
+    activeItemClassName: PropTypes.string,
+    requiredInputLength: PropTypes.number,
+    clearInputOnSelect: PropTypes.bool,
+    suppressReselect: PropTypes.bool,
+    dropDownLength: PropTypes.number,
+    initialValue: PropTypes.string,
+};
+
+DataListInput.defaultProps = {
+    placeholder: '',
+    match: undefined,
+    inputClassName: '',
+    dropdownClassName: '',
+    itemClassName: '',
+    activeItemClassName: '',
+    requiredInputLength: 0,
+    clearInputOnSelect: false,
+    suppressReselect: true,
+    dropDownLength: Infinity,
+    initialValue: '',
+};
+
+export default DataListInput;

testing/demo-app/src/index.css

@@ -0,0 +1,13 @@
+body {
+  margin: 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;
+}

testing/demo-app/src/index.js

@@ -0,0 +1,12 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import * as serviceWorker from './serviceWorker';
+
+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: https://bit.ly/CRA-PWA
+serviceWorker.unregister();

testing/demo-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>

testing/demo-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 https://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 https://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 https://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();
+    });
+  }
+}