webpack.dev.js

const webpack = require("webpack");
const merge = require("webpack-merge");
const common = require("./webpack.common.js");
const path = require("path");

// Bundles (CSS) to own CSS file rather than embedded in CSS.
const ExtractTextPlugin = require("extract-text-webpack-plugin");

module.exports = merge(common, {
  mode: "development",
  output: {
    path: path.resolve(__dirname, "docs"),
    filename: "[name].js",
    chunkFilename: "[name].js",
    publicPath: "./"
  },
  devtool: "inline-source-map",
  devServer: {
    hot: true
  },
  plugins: [new webpack.HotModuleReplacementPlugin()],
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: "style-loader",
          use: [
            {
              loader: "css-loader",
              options: {
                importLoaders: 1
              }
            },
            "postcss-loader"
          ]
        })
      },
      {
        test: /\.(png|jp(e*)g|svg)$/,
        use: [
          {
            loader: "url-loader",
            options: {
              limit: 8000, // Convert images < 8kb to base64 strings
              name: "assets/images/[hash]-[name].[ext]"
            }
          }
        ]
      }
    ]
  }
});