webpack.config.js

const HtmlWebPackPlugin = require("html-webpack-plugin");
const path = require("path");
const autoprefixer = require("autoprefixer");

module.exports = {
  entry: ["./src/index.js", "./src/css/app.scss"],
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, "dist")
  },
  devServer: {
    historyApiFallback: true
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /\.html$/,
        use: [
          {
            loader: "html-loader"
          }
        ]
      },
      {
        test: /\.scss$/,
        use: [
          {
            loader: "file-loader",
            options: {
              name: "bundle.css"
            }
          },
          { loader: "extract-loader" },
          { loader: "css-loader" },
          {
            loader: "postcss-loader",
            options: {
              plugins: () => [autoprefixer()]
            }
          },
          {
            loader: "sass-loader",
            options: {
              includePaths: ["./node_modules"]
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: "./src/index.html",
      filename: "./index.html"
    })
  ]
};