webpack.common.js

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

module.exports = {
    entry: [
        './src/index.js',
    ],
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: [
                    "babel-loader"
                ]
            },
            {
                test: /\.scss$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    "css-loader",
                    "postcss-loader",
                    "sass-loader",
                ]
            },
            {
                test: /\.html$/,
                use: [
                    "html-loader"
                ]
            }
        ]
    },
    plugins: [
        new CleanWebpackPlugin(),
        new MiniCssExtractPlugin(),
        new HtmlWebpackPlugin({
            filename: "index.html",
            template: "./src/index.html",
            inject: "body"
        })
    ]
};