webpack.dev.js

const {merge} = require("webpack-merge");
const path = require("path");
const {CleanWebpackPlugin} = require("clean-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");

const common = require("./webpack.common");

module.exports = merge(common, {
  mode: "development",

  module: {
    rules: [
      {
        test: /\.(sa|sc|c)ss$/,
        exclude: /node_modules/,
        use: ["style-loader",
          {
            loader: "css-loader",
            options: {
              url: false
            }
          },
          "postcss-loader",
          {
            loader: "sass-loader",
            options: {
              additionalData: "$prefix: \"" + (process.env.NODE_ENV === "production" ? "/moon-cloud" : "") + "\";"
            }
          }]
      }
    ]
  },

  output: {
    filename: "[name].js",
    chunkFilename: "[id].css"
  },

  devServer: {
    port: process.env.PORT || 3000,
    contentBase: path.join(process.cwd(), "./dist"),
    watchContentBase: true,
    quiet: false,
    open: true,
    historyApiFallback: {
      rewrites: [{from: /./, to: "404.html"}]
    }
  },

  plugins: [
    new CleanWebpackPlugin({
      cleanOnceBeforeBuildPatterns: [
        "dist/**/*.js",
        "dist/**/*.css",
        "site/content/webpack.json"
      ]}),

    new MiniCssExtractPlugin({
      filename: "[name].css",
      chunkFilename: "[id].css"
    })
  ],
  devtool: "eval-source-map"
});