upgrade to Angular 12

Author: jhades

angular.json

@@ -13,7 +13,6 @@
         "build": {
           "builder": "@angular-devkit/build-angular:browser",
           "options": {
-            "aot": true,
             "outputPath": "dist/angular-course",
             "index": "src/index.html",
             "main": "src/main.ts",
@@ -35,7 +34,13 @@
                 "input": "node_modules/document-register-element/build/document-register-element.js",
                 "inject": true
               }
-            ]
+            ],
+            "vendorChunk": true,
+            "extractLicenses": false,
+            "buildOptimizer": false,
+            "sourceMap": true,
+            "optimization": false,
+            "namedChunks": true
           },
           "configurations": {
             "production": {
@@ -55,7 +60,6 @@
               "outputHashing": "all",
               "sourceMap": false,
               "namedChunks": false,
-              "aot": true,
               "extractLicenses": true,
               "vendorChunk": false,
               "buildOptimizer": true