Merge pull request #1491 from shanmukhateja/ng-11

Angular 11 support

Author: l-lin

demo/angular.json

@@ -47,14 +47,16 @@
               "node_modules/datatables.net-colreorder/js/dataTables.colReorder.js",
               "node_modules/datatables.net-responsive/js/dataTables.responsive.js",
               "node_modules/datatables.net-select/js/dataTables.select.js"
+            ],
+            "allowedCommonJsDependencies": [
+              "highlight.js"
             ]
           },
           "configurations": {
             "production": {
               "optimization": true,
               "outputHashing": "all",
               "sourceMap": false,
-              "extractCss": true,
               "namedChunks": false,
               "extractLicenses": true,
               "vendorChunk": false,