Webpack React App

.babelrc

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

package.json

{
  "name": "rrrreact",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "build": "webpack"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-loader": "^8.0.6",
    "css-loader": "^3.2.0",
    "html-webpack-plugin": "^3.2.0",
    "less": "^3.10.1",
    "less-loader": "^5.0.0",
    "mini-css-extract-plugin": "^0.8.0",
    "postcss-loader": "^3.0.0",
    "style-loader": "^1.0.0",
    "url-loader": "^2.1.0",
    "webpack": "^4.39.2",
    "webpack-cli": "^3.3.6"
  },
  "dependencies": {
    "@babel/core": "^7.5.5",
    "@babel/preset-env": "^7.5.5",
    "@babel/preset-react": "^7.0.0",
    "react": "^16.9.0",
    "react-dom": "^16.9.0"
  }
}

webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'main.js',
    path: path.resolve(__dirname, 'dist')
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: [{
          loader: 'url-loader',
          options: { limit: 10240 },
        }]
      },
      {
        test: /\.less$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              // you can specify a publicPath here
              // by default it uses publicPath in webpackOptions.output
              publicPath: '../',
              hmr: process.env.NODE_ENV === 'development',
            },
          },
          {
            loader: 'css-loader',
            options: {
              modules: {
                mode: 'local',
                localIdentName: '[name]__[hash:base64:5]__[local]',
                context: path.resolve(__dirname, 'src'),
                hashPrefix: 'my-custom-hash',
              },
            }
          },
          'less-loader',
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: path.join(__dirname, "src", "index.html")
    }),
    new MiniCssExtractPlugin({
      // Options similar to the same options in webpackOptions.output
      // all options are optional
      filename: '[name].css',
      chunkFilename: '[id].css',
      ignoreOrder: false, // Enable to remove warnings about conflicting order
    }),
  ]
};