Upgrade webpack

packages/0x.js/package.json

@@ -52,13 +52,12 @@
         "@types/node": "*",
         "@types/sinon": "^2.2.2",
         "@types/web3-provider-engine": "^14.0.0",
-        "awesome-typescript-loader": "^3.1.3",
+        "awesome-typescript-loader": "^5.2.1",
         "chai": "^4.0.1",
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^2.0.1",
         "copyfiles": "^2.0.0",
         "dirty-chai": "^2.0.1",
-        "json-loader": "^0.5.4",
         "make-promises-safe": "^1.1.0",
         "mocha": "^4.1.0",
         "npm-run-all": "^4.1.2",
@@ -70,8 +69,8 @@
         "tslint": "5.11.0",
         "typedoc": "0.12.0",
         "typescript": "3.0.1",
-        "uglifyjs-webpack-plugin": "^1.3.0",
-        "webpack": "^3.1.0"
+        "uglifyjs-webpack-plugin": "^2.0.1",
+        "webpack": "^4.20.2"
     },
     "dependencies": {
         "@0xproject/assert": "^1.0.12",

packages/0x.js/webpack.config.js

@@ -2,8 +2,7 @@
  * This is to generate the umd bundle only
  */
 const _ = require('lodash');
-const webpack = require('webpack');
-const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
+const TerserPlugin = require('terser-webpack-plugin');
 const path = require('path');
 const production = process.env.NODE_ENV === 'production';
 
@@ -16,6 +15,7 @@ if (production) {
 
 module.exports = {
     entry,
+    mode: 'production',
     output: {
         path: path.resolve(__dirname, '_bundles'),
         filename: '[name].js',
@@ -27,19 +27,18 @@ module.exports = {
         extensions: ['.ts', '.js', '.json'],
     },
     devtool: 'source-map',
-    plugins: [
-        // TODO: Revert to webpack bundled version with webpack v4.
-        // The v3 series bundled version does not support ES6 and
-        // fails to build.
-        new UglifyJsPlugin({
-            sourceMap: true,
-            uglifyOptions: {
-                mangle: {
-                    reserved: ['BigNumber'],
+    optimization: {
+        minimizer: [
+            new TerserPlugin({
+                sourceMap: true,
+                terserOptions: {
+                    mangle: {
+                        reserved: ['BigNumber'],
+                    },
                 },
-            },
-        }),
-    ],
+            }),
+        ],
+    },
     module: {
         rules: [
             {
@@ -59,10 +58,6 @@ module.exports = {
                 ],
                 exclude: /node_modules/,
             },
-            {
-                test: /\.json$/,
-                loader: 'json-loader',
-            },
         ],
     },
 };