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package.json file

"name": "my-app",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^5.11.6",
"@testing-library/react": "^11.2.2",
"@testing-library/user-event": "^12.6.0",
"react": "^17.0.1",
"react-dom": "^17.0.1",
"react-scripts": "4.0.1",
"web-vitals": "^0.2.4"
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
"eslintConfig": {
"extends": [
"browserslist": {
"production": [
"not dead",
"not op_mini all"
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"


node_module folder

public folder

<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8" />
<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="theme-color" content="#000000" />
content="Web site created using create-react-app"
<link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
manifest.json provides metadata used when your web app is installed on a user's mobile device or desktop. See
<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>
<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`.
import logo from './logo.svg';
import './App.css';

function App() {
return (
<div className="App">
<header className="App-header">
<img src={logo} className="App-logo" alt="logo" />
Edit <code>src/App.js</code> and save to reload.
rel="noopener noreferrer"
Learn React

export default App;
import './App.css';

function App() {
return (
<div className="App">
<h3>Hello World</h3>
<p>You are now editing the <code>App.js</code> file</p>

export default App;

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