Install tslib

Author: jeroenheijmans

package-lock.json

@@ -26,9 +26,9 @@
     "zone.js": "^0.9.1"
   },
   "devDependencies": {
-    "@angular/compiler-cli": "^8.2.14",
     "@angular-devkit/build-angular": "~0.803.25",
     "@angular/cli": "~8.3.25",
+    "@angular/compiler-cli": "^8.2.14",
     "@angular/language-service": "^8.2.14",
     "@types/jasmine": "~3.3.8",
     "@types/jasminewd2": "~2.0.3",
@@ -43,6 +43,7 @@
     "karma-jasmine-html-reporter": "^1.4.0",
     "protractor": "~5.4.0",
     "ts-node": "~7.0.0",
+    "tslib": "^1.11.1",
     "tslint": "~5.15.0",
     "typescript": "~3.5.3"
   }