webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const miniCss = require('mini-css-extract-plugin');

module.exports = {
    entry: "./src/index.js",
    output: {
        path: path.join(__dirname, "/dist"),
        filename: "index_bundle.js"
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader"
                },
            },
            {
                test: /\.css$/,
                use: ["style-loader", "css-loader"]
            },
            {
                test:/\.(s*)css$/,
                use: [
                    miniCss.loader,
                    'css-loader',
                    'sass-loader',
                ]
            },
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: "./src/index.html"
        }),
        new ExtractTextPlugin('./src/index.css'),
        new miniCss({
            filename: 'style.css',
        }),
    ]
};