webpack.common.js

const CleanWebpackPlugin = require('clean-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
    entry: {
        app: './src/index.js',
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                },
            },
            {
                test: /\.less$/,
                use: [{
                    loader: 'style-loader', // creates style nodes from JS strings
                }, {
                    loader: 'css-loader', // translates CSS into CommonJS
                }, {
                    loader: 'less-loader', // compiles Less to CSS
                }],
            },
        ],
    },
    plugins: [
        new CleanWebpackPlugin(['dist']),
        new HtmlWebpackPlugin({
            template: './src/index.html',
        }),
    ],
};