Upgrade UglifyJS to include ES6 support

1 files changed, 9 insertions, 3 deletions

diff --git a/packages/website/webpack.config.js b/packages/website/webpack.config.js
index e28e9e064..f9abeb27c 100644
--- a/packages/website/webpack.config.js
+++ b/packages/website/webpack.config.js
@@ -1,5 +1,6 @@
 const path = require('path');
 const webpack = require('webpack');
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
 
 module.exports = {
     entry: ['./ts/index.tsx'],
@@ -76,9 +77,14 @@ module.exports = {
                           NODE_ENV: JSON.stringify(process.env.NODE_ENV),
                       },
                   }),
-                  new webpack.optimize.UglifyJsPlugin({
-                      mangle: {
-                          except: ['BigNumber'],
+                  // TODO: Revert to webpack bundled version with webpack v4.
+                  // The v3 series bundled version does not support ES6 and
+                  // fails to build.
+                  new UglifyJsPlugin({
+                      uglifyOptions: {
+                          mangle: {
+                              reserved: ['BigNumber'],
+                          },
                       },
                   }),
               ]