A JavaScript library for building user interfaces
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JSX is a syntax extension to JavaScript. It is recommended to use it with React to describe what the UI should look like. JSX produces React “elements”.
# create the application and launch it (starts the development server)
npx create-react-app my-app
cd my-app
npm start
# later on...
# bundles the app into static files for production
npm run build
# starts the test runner
npm test
# removes the tool and copies build dependencies, configuration files and scripts into the app directory (no coming back)
npm run eject- DigitalOcean: How To Code in React.js eBook - July 30, 2021
Jest is a delightful JavaScript Testing Framework with a focus on simplicity.
→ jestjs.io (Testing React Apps)
Install dev dependancies: testing-library/react, testing-library/jest-dom
npm install --save-dev @testing-library/react @testing-library/jest-dom