webpack: Removed happypack

This was done to address issues with enumerating network devices on Ubuntu for Windows,
which requires for node to be patched at runtime.

See:
https://github.com/CherryDT/wsl_node_network_interfaces_shim
microsoft/WSL#468

package.json

@@ -60,7 +60,6 @@
     "git-rev-sync": "1.8.0",
     "glob": "7.1.1",
     "handlebars-loader": "1.4.0",
-    "happypack": "^3.0.3",
     "history": "3.2.1",
     "html-webpack-plugin": "e1-bsd/html-webpack-plugin#3193e3d299ff1b379110eac2909ef945283ab379",
     "image-webpack-loader": "3.0.0",

webpack.config.js

@@ -3,15 +3,13 @@
 
 'use strict';
 
-const os = require('os');
 const path = require('path');
 const webpack = require('webpack');
 const combineLoaders = require('webpack-combine-loaders');
 const git = require('git-rev-sync');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const CopyWebpackPlugin = require('copy-webpack-plugin');
 const Visualizer = require('webpack-visualizer-plugin');
-const HappyPack = require('happypack');
 
 const packageInfo = require(path.resolve('package.json'));
 const version = packageInfo.version;
@@ -32,9 +30,6 @@ const regExpFonts = new RegExp(`fonts\\${path.sep}.+\\.(woff2?|ttf|eot|otf|svg)$
 const regExpInlineSvgs = new RegExp(`(\\.inline\\.svg$)|(components\\${path.sep}Icon\\${path.sep}.+\\.svg$)`);
 const regExpFavicons = new RegExp(`assets\\${path.sep}favicons\\${path.sep}.+$`);
 
-HappyPack.SERIALIZABLE_OPTIONS = HappyPack.SERIALIZABLE_OPTIONS.concat(['postcss']);
-const happyPackThreadPool = new HappyPack.ThreadPool({ size: os.cpus().length });
-
 const BABEL_CACHE_ENABLED = true;
 
 const jsxLoader = combineLoaders([
@@ -82,15 +77,15 @@ module.exports = {
       {
         test: /\.jsx?$/,
         exclude: excluded,
-        loader: isDev ? 'happypack/loader?id=jsx' : jsxLoader,
+        loader: jsxLoader,
       },
       {
         test: /\.css$/,
         loader: 'style!css?root=.',
       },
       {
         test: /\.postcss$/,
-        loader: isDev ? 'happypack/loader?id=postcss' : postcssLoader,
+        loader: postcssLoader,
       },
       {
         test: regExpFonts,
@@ -157,27 +152,6 @@ module.exports = {
           }),
         ] :
         [])
-      .concat(isDev ?
-        [
-          new HappyPack({
-            id: 'jsx',
-            cache: ! BABEL_CACHE_ENABLED,
-            threadPool: happyPackThreadPool,
-            loaders: [jsxLoader],
-            cacheContext: {
-              env: process.env.NODE_ENV,
-            },
-          }),
-          new HappyPack({
-            id: 'postcss',
-            threadPool: happyPackThreadPool,
-            loaders: [postcssLoader],
-            cacheContext: {
-              env: process.env.NODE_ENV,
-            },
-          }),
-        ] :
-        [])
       .concat([
         new HtmlWebpackPlugin({
           template: path.join(__dirname, 'lib/index.html'),