webpack.config.js

const path = require("path");
const webpack = require("webpack");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const sass = require("sass");

module.exports = {
    context: path.resolve(__dirname, "./src"),
    entry: {
        app: ["./js/app.js"],
        styles: "./css/style.scss",
    },

    output: {
        path: path.resolve(__dirname, "dist"),
        filename: "[name].bundle.js",
        publicPath: "/dist/",
    },

    devServer: {
        historyApiFallback: true,
        static: path.resolve(__dirname, "./"),
    },

    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: [/node_modules/],
                use: [
                    {
                        loader: "babel-loader",
                        options: {
                            presets: [
                                "@babel/preset-react",
                                "@babel/preset-env",
                            ],
                        },
                    },
                ],
            },
            {
                test: /\.(scss|css)$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    {
                        loader: "css-loader",
                        options: {
                            sourceMap: true,
                        },
                    },
                    {
                        loader: "postcss-loader",
                        options: {
                            sourceMap: true,
                            postcssOptions: {
                                plugins: ["autoprefixer"],
                            },
                        },
                    },
                    {
                        loader: "sass-loader",
                        options: {
                            sourceMap: true,
                            implementation: sass,
                            sassOptions: {
                                outputStyle: "compressed",
                            },
                        },
                    },
                ],
            },
        ],
    },

    plugins: [
        new MiniCssExtractPlugin({ filename: "[name].min.css" }),
        new webpack.EnvironmentPlugin(["NODE_ENV"]),
    ],
};