chore(example): updated create-react-app example for v4 of react-scripts

Author: mlaursen

Diff for: examples/create-react-app/README.md

@@ -1,30 +1,22 @@
 # ReactMD and Create React App Example
 
-This project was bootstrapped with
-[Create React App](https://github.com/facebook/create-react-app) using
-[react-md](https://react-md.dev) as the component library.
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app) using [react-md](https://react-md.dev) as the component library.
 
 ## What's Included
 
-This example will setup an example Create React App + ReactMD app that has the
-following features:
+This example will setup an example Create React App + ReactMD app that has the following features:
 
-- [jsconfig.json](./jsconfig.json) to allow absolute imports instead of relative
-  imports from the `"src"` directory
-  - `import MyComponent from "components/MyComponent"` instead of
-    `import MyComponent from "../../components/MyComponent"`
-- [\_variables.scss](./src/_variables.scss) to override the default `react-md`
-  theme and feature toggles
+- [jsconfig.json](./jsconfig.json) to allow absolute imports instead of relative imports from the `"src"` directory
+  - `import MyComponent from "components/MyComponent"` instead of `import MyComponent from "../../components/MyComponent"`
+- [\_variables.scss](./src/_variables.scss) to override the default `react-md` theme and feature toggles
 - a reusable [Layout.jsx](./src/components/Layout/Layout.jsx) that:
   - updates all the icons to use `SVGIcon`s instead of `FontIcon`s
   - initializes the `Layout` component from `react-md` with navigation items
-  - uses [react-router-dom](https://www.npmjs.com/package/react-router-dom) as
-    the routing library
+  - uses [react-router-dom](https://www.npmjs.com/package/react-router-dom) as the routing library
 
 ## How to Use
 
-Since this example is not a separate repo, this example will need to be manually
-downloaded instead of using `create-react-app`:
+Since this example is not a separate repo, this example will need to be manually downloaded instead of using `create-react-app`:
 
 ```bash
 curl https://codeload.github.com/mlaursen/react-md/tar.gz/main | tar -xz --strip=2 react-md-main/examples/create-react-app
@@ -51,96 +43,79 @@ git commit -m "Initial commit"
 
 ## Learn More
 
-To learn more about react-md and Next.js, take a look at the following
-resources:
+To learn more about react-md and Next.js, take a look at the following resources:
 
 - [react-md Documentation](https://react-md.dev)
 - [Configuring your Layout](https://react-md.dev/guides/configuring-your-layout)
 - [Create React App Documentation](https://create-react-app.dev/)
 
+# Getting Started with Create React App
+
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
 ## Available Scripts
 
 In the project directory, you can run:
 
 ### `yarn start`
 
-Runs the app in the development mode.<br /> Open
-[http://localhost:3000](http://localhost:3000) to view it in the browser.
+Runs the app in the development mode.\
+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.
+The page will reload if you make edits.\
+You will also see any lint errors in the console.
 
 ### `yarn 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.
+Launches the test runner in the interactive watch mode.\
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
 
 ### `yarn 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.
+Builds the app for production to the `build` folder.\
+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!
+The build is minified and the filenames include the hashes.\
+Your app is ready to be deployed!
 
-See the section about
-[deployment](https://facebook.github.io/create-react-app/docs/deployment) for
-more information.
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
 
 ### `yarn 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.
+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.
+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.
+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).
+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
+This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](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
+This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](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
+This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](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
+This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](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
+This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
 
 ### `yarn build` fails to minify
 
-This section has moved here:
-https://facebook.github.io/create-react-app/docs/troubleshooting#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](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)

Diff for: examples/create-react-app/package.json

@@ -9,20 +9,22 @@
     "eject": "react-scripts eject"
   },
   "dependencies": {
-    "react": "^16.13.1",
-    "react-dom": "^16.13.1",
+    "@testing-library/jest-dom": "^5.11.6",
+    "@testing-library/react": "^11.1.2",
+    "@testing-library/user-event": "^12.2.2",
+    "node-sass": "^4.14.1",
+    "react": "^17.0.1",
+    "react-dom": "^17.0.1",
     "react-md": "latest",
     "react-router-dom": "^5.2.0",
-    "react-scripts": "3.4.1"
-  },
-  "devDependencies": {
-    "@testing-library/jest-dom": "^4.2.4",
-    "@testing-library/react": "^9.3.2",
-    "@testing-library/user-event": "^7.1.2",
-    "node-sass": "^4.14.1"
+    "react-scripts": "4.0.0",
+    "web-vitals": "^0.2.4"
   },
   "eslintConfig": {
-    "extends": "react-app"
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
   },
   "browserslist": {
     "production": [

Diff for: examples/create-react-app/src/index.jsx

@@ -3,7 +3,7 @@ import ReactDOM from 'react-dom';
 import './index.scss';
 import App from './App';
 import { BrowserRouter as Router } from 'react-router-dom';
-import * as serviceWorker from './serviceWorker';
+import reportWebVitals from './reportWebVitals';
 
 ReactDOM.render(
   <Router>
@@ -12,7 +12,7 @@ ReactDOM.render(
   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();
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

Diff for: examples/create-react-app/src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = (onPerfEntry) => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

Diff for: examples/create-react-app/src/serviceWorker.js

@@ -2,4 +2,4 @@
 // allows you to do things like:
 // expect(element).toHaveTextContent(/react/i)
 // learn more: https://github.com/testing-library/jest-dom
-import '@testing-library/jest-dom/extend-expect';
+import '@testing-library/jest-dom';