Add babel for ES6 support

(cherry picked from commit e58bd66)

Author: taylortom

Gruntfile.js

@@ -108,7 +108,6 @@ module.exports = function(grunt) {
           name: 'core/app',
           mainConfigFile: "frontend/src/core/config.js",
           out: "frontend/build/js/origin.js",
-          generateSourceMaps: true,
           preserveLicenseComments: true,
           optimize: "none"
         }
@@ -119,10 +118,32 @@ module.exports = function(grunt) {
           name: 'core/app',
           mainConfigFile: "frontend/src/core/config.js",
           out: "frontend/build/js/origin.js",
-          optimize: "uglify2"
+          optimize: "none"
         }
       }
     },
+    babel: {
+      dev: {
+        options: {
+          compact: false,
+          retainLines: true,
+          presets: [ [ '@babel/preset-env', { targets: { ie: '11' } } ] ],
+          sourceType: 'script'
+        },
+        src: 'frontend/build/js/origin.js',
+        dest: 'frontend/build/js/origin.js'
+      },
+      compile: {
+        options: {
+          comments: false,
+          minified: true,
+          presets: [ [ '@babel/preset-env', { targets: { ie: '11' } } ] ],
+          sourceType: 'script'
+        },
+        src: 'frontend/build/js/origin.js',
+        dest: 'frontend/build/js/origin.js'
+      }
+    },
     mochaTest: {
       src: ['test/*.js'],
       options: {
@@ -315,10 +336,10 @@ module.exports = function(grunt) {
       config.isProduction = isProduction;
       grunt.file.write(configFile, JSON.stringify(config, null, 2));
       // run the task
-      grunt.task.run(['migration-conf', 'requireBundle', 'generate-lang-json', 'copy', 'less:' + compilation, 'handlebars', 'requirejs:'+ compilation]);
+      grunt.task.run(['migration-conf', 'requireBundle', 'generate-lang-json', 'copy', 'less:' + compilation, 'handlebars', 'requirejs:'+ compilation, `babel:${compilation}`]);
 
     } catch(e) {
-      grunt.task.run(['requireBundle', 'copy', 'less:' + compilation, 'handlebars', 'requirejs:' + compilation]);
+      grunt.task.run(['requireBundle', 'copy', 'less:' + compilation, 'handlebars', 'requirejs:' + compilation, `babel:${compilation}`]);
     }
   });
 };

frontend/src/core/app.js

@@ -11,6 +11,7 @@
       'jqueryForm',
       'jqueryTagsInput',
       'jqueryUI',
+      'polyfill',
       'scrollTo',
       'selectize',
       'sweetalert',

frontend/src/core/config.js

@@ -15,6 +15,7 @@ require.config({
     modernizr: 'libraries/modernizr',
     moment: 'libraries/moment.min',
     pikaday: 'libraries/pikaday/js/pikaday',
+    polyfill: 'libraries/polyfill.min',
     polyglot: 'libraries/polyglot.min',
     scrollTo: 'libraries/scrollTo',
     selectize: 'libraries/selectize/js/selectize',