npx create-react-app my-app // creat react application
// npm init react-app my-app, available in npm 6+
cd my-app
npm start //default domain http://localhost:3000/
		

/Project
	README.md
	node_modules/
	package.json
	package-lock.json
	public/
		index.html //page template
	src/
		App.css
		App.js
		App.test.js
		index.css
		index.js //JavaScript entry point
		logo.svg
		

npm run build // Builds the app for production to the build folder
cp -r ./build/* /Application/AMPPS/www // copy content in build folder to the root of the website
		

//temp.js
function hello()
{
	console.log("Hello World!");
}

function sum(a, b)
{
	return a+b;
}

export {hello, sum};
		

//temp.test.js
import {hello, sum} from "./temp.js"

it('hello test', () => {
	hello();
});

it('sums numbers', () => {
  expect(sum(1, 2)).toEqual(3);
  expect(sum(2, 2)).toEqual(4);
});

		

npm test // under the root directory of the project
		

$ npm install -g npm@latest  # or, npm install -g npm@latest --prefix "C:\Program Files\nodejs"
$ rm -rf node_modules        # or, `cmd /c rmdir /s /q node_modules` on Windows
$ npm install