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Configuring webpack 4 with React

npm init -y
npm i react react-dom prop-types
npm i --save-dev webpack webpack-dev-server webpack-cli

Babel to transpile code from ES6

npm i --save-dev @babel/core babel-loader @babel/preset-env 
npm i --save-dev @babel/preset-react html-webpack-plugin

JSX

npm i --save-dev @babel/plugin-transform-react-jsx

Loader

npm i -D css-loader style-loader html-loader sass-loader

JEST

npm i --save-dev jest babel-jest
npm i --save-dev @babel/plugin-syntax-jsx

React testing library

npm i --save-dev @testing-library/react @testing-library/jest-dom
npm i --save-dev @testing-library/user-event

Eslint

npm install eslint --save-dev
npm i --save-dev eslint-plugin-testing-library
npm i --save-dev eslint-plugin-jest-dom

Webpack Plugin

npm i -D clean-webpack-plugin mini-css-extract-plugin node-sass

create the config.webpack.js file where all webpack config will remain

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const { CleanWebpackPlugin } = require("clean-webpack-plugin");

module.exports ={
    entry: './src/index.js',
    output: {
        path: path.join(__dirname, 'dist'),
        filename: 'bundle.[fullhash].js'
    },
    module :{
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader'
                } 
            },
            {
                        test: /\.scss$/,
                        use: ["style-loader", "css-loader", "sass-loader"],
                },
                {
                        test: /\.html$/,
                        loader: "html-loader",
                },
                {
                        test: /\.(svg|png|jpg)$/,
                        use: {
                            loader: "file-loader",
                            options: {
                                name: "[name].[hash].[ext]",
                                outputPath: "img",
                            },
                        },
                },
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: './src/index.html'
        }),
        new CleanWebpackPlugin(),
    ]
}

create the src folder and src/index.js

create .babelrc file at the root of the app

or include it in the Package.json as below

{
  "presets": ["@babel/preset-env","@babel/preset-react"]
} 

Package.json should look like below :

    {
  "name": "drum-machine",
  "version": "1.0.0",
  "description": "Freecodecamp - React Drum machine",
  "main": "index.js",
  "babel":{
      "presets":[
          "@babel/preset-env",
          "@babel/preset-react"
      ]
  },
  "scripts": {
    "start": "webpack-dev-server --mode development --open --hot",
    "build": "webpack --mode production"
  },
  "author": "Stephane Candelas",
  "license": "ISC",
  "dependencies": {
    "react": "^16.8.6",
    "react-dom": "^16.8.6"
  },
  "devDependencies": {
    "@babel/core": "^7.5.5",
    "@babel/preset-env": "^7.5.5",
    "@babel/preset-react": "^7.0.0",
    "babel-loader": "^8.0.6",
    "html-webpack-plugin": "^3.2.0",
    "webpack": "^4.36.1",
    "webpack-cli": "^3.3.6",
    "webpack-dev-server": "^3.7.2"
  }
}

Adding babel-plugin-transform-class-properties

npm i --save-dev babel-plugin-transform-class-properties

Adding this package will transform the arrow function in class component to avoid having to bind the this.method. Once npm packaged installed add .babelrc the following :

{
"presets":["@babel/preset-env","@babel/preset-react"],
"plugins": ["transform-class-properties"]
}