webpack.config.js

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

module.exports = {
  entry: "./src/index.js",
  devtool: "inline-source-map",
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "bundle.js"
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: "babel-loader"
      },
      {
        test: /(\.css|\.scss)$/,
        loaders: ["style-loader", "css-loader", "sass-loader"]
      },
      {
        test: /\.(gif|png|jpe?g)$/i,
        loader: [
          "file-loader",
          {
            loader: "image-webpack-loader",
            query: {
              bypassOnDebug: true,
              mozjpeg: {
                progressive: true
              },
              gifsicle: {
                interlaced: false
              },
              optipng: {
                optimizationLevel: 4
              },
              pngquant: {
                quality: "75-90",
                speed: 3
              }
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./src/index.html"
    })
  ]
};