Issue after upgrading Angular 4 to angular 8

Question

Currently I am using Angular 4 in my application with system.js. Now I am updating it to Angular 8.

For that I follow below 2 links:

upgrade angular 4 project to

Answer 1

Here is the Angular Update Guide from the angular website.

I noticed you are using two versions of typescript, "2.5.3" and "3.7.2" in your dev dependencies, I would use only one version (the recommended version by angular) ~"3.1".

I Recommend you update 1 version at a time, I know its so lengthy process but you it will be easier to fix issues than just jumping from 4 to 8.