Actualizar a Angular 7

Los errores anteriores siguen prevaleciendo, porque actualmente el mayor inconveniente es un error, al parecer, causado por una dependencia o import ciclic@. Veremos si pasando a Angular 8 podemos remover este problema.

Frontend Angular 4/package.json

@@ -12,14 +12,14 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/common": "^6.1.10",
-    "@angular/compiler": "^6.1.10",
-    "@angular/core": "^6.1.10",
-    "@angular/forms": "^6.1.10",
-    "@angular/http": "^6.1.10",
-    "@angular/platform-browser": "^6.1.10",
-    "@angular/platform-browser-dynamic": "^6.1.10",
-    "@angular/router": "^6.1.10",
+    "@angular/common": "^7.2.16",
+    "@angular/compiler": "^7.2.16",
+    "@angular/core": "^7.2.16",
+    "@angular/forms": "^7.2.16",
+    "@angular/http": "^7.2.16",
+    "@angular/platform-browser": "^7.2.16",
+    "@angular/platform-browser-dynamic": "^7.2.16",
+    "@angular/router": "^7.2.16",
     "@ng-bootstrap/ng-bootstrap": "2.0.0",
     "@ngx-translate/core": "^10.0.0",
     "@ngx-translate/http-loader": "^3.0.0",
@@ -37,15 +37,16 @@
     "ng2-bootstrap-modal": "^1.0.1",
     "ng2-codemirror": "^1.1.1",
     "ng2-slider-component": "^1.0.9",
-    "rxjs": "6.0.0",
+    "rxjs": "6.6.7",
     "tippy.js": "^1.2.0",
+    "tslib": "^1.9.0",
     "web-animations-js": "^2.3.1",
     "zone.js": "^0.8.4"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^0.13.9",
-    "@angular/cli": "^6.1.10",
-    "@angular/compiler-cli": "^6.1.10",
+    "@angular-devkit/build-angular": "~0.13.0",
+    "@angular/cli": "^7.3.10",
+    "@angular/compiler-cli": "^7.2.16",
     "@types/jasmine": "2.5.38",
     "@types/jquery": "^2.0.45",
     "@types/node": "~6.0.60",
@@ -62,6 +63,6 @@
     "sass": "^1.55.0",
     "ts-node": "~2.0.0",
     "tslint": "^5.0.0",
-    "typescript": "~2.7.2"
+    "typescript": "~3.2.4"
   }
 }

Frontend Angular 4/src/styles/bootstrap/_responsive-embed.scss

@@ -35,18 +35,18 @@
 
 .embed-responsive-16by9 {
   &::before {
-    padding-top: percentage(9 / 16);
+    padding-top: percentage(0.5625);
   }
 }
 
 .embed-responsive-4by3 {
   &::before {
-    padding-top: percentage(3 / 4);
+    padding-top: percentage(0.75);
   }
 }
 
 .embed-responsive-1by1 {
   &::before {
-    padding-top: percentage(1 / 1);
+    padding-top: percentage(1);
   }
 }

Frontend Angular 4/tsconfig.json

 {
   "compileOnSave": false,
   "compilerOptions": {
+    "importHelpers": true,
     "outDir": "./dist/out-tsc",
     "baseUrl": "src",
     "sourceMap": true,