webpack.common.js

const webpack = require("webpack");
const path = require("path");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const AssetsPlugin = require("assets-webpack-plugin");

module.exports = {
  entry: {
    main: path.join(__dirname, "src", "index.js")
  },

  output: {
    path: path.join(__dirname, "dist")
  },

  module: {
    rules: [
      {
        test: /\.((png)|(eot)|(woff)|(woff2)|(ttf)|(svg)|(gif))(\?v=\d+\.\d+\.\d+)?$/,
        loader: "file-loader?name=/[hash].[ext]"
      },

      {test: /\.json$/, loader: "json-loader"},

      {
        loader: "babel-loader",
        test: /\.js?$/,
        exclude: /node_modules/,
        query: {cacheDirectory: true}
      },

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

  plugins: [
    new webpack.ProvidePlugin({
      fetch: "imports-loader?this=>global!exports-loader?global.fetch!whatwg-fetch"
    }),

    new AssetsPlugin({
      filename: "webpack.json",
      path: path.join(process.cwd(), "site/data"),
      prettyPrint: true
    }),

    new CopyWebpackPlugin({patterns: [
      {
        from: "./src/fonts/",
        to: "fonts/",
        flatten: true
      }
    ]})
  ]
};