Fix faling test due to webpack upgrade

Author: ankurk91

.babelrc

@@ -1,7 +1,7 @@
 {
   "presets": [
     [
-      "@babel/env",
+      "@babel/preset-env",
       {
         "modules": false,
         "forceAllTransforms": true,
@@ -14,13 +14,13 @@
     ]
   ],
   "plugins": [
-    "@babel/transform-object-assign"
+    "@babel/plugin-transform-object-assign"
   ],
   "env": {
     "test": {
       "presets": [
         [
-          "@babel/env",
+          "@babel/preset-env",
           {
             "targets": {
               "node": "current"

webpack.config.js

@@ -4,7 +4,7 @@ const webpack = require('webpack');
 const path = require('path');
 const CleanWebpackPlugin = require('clean-webpack-plugin');
 const UnminifiedWebpackPlugin = require('unminified-webpack-plugin');
-const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
+const TerserPlugin = require('terser-webpack-plugin');
 
 module.exports = {
   context: __dirname,
@@ -48,9 +48,9 @@ module.exports = {
   },
   optimization: {
     minimizer: [
-      new UglifyJsPlugin({
+      new TerserPlugin({
         sourceMap: false,
-        uglifyOptions: {
+        terserOptions: {
           output: {
             beautify: false
           },