.net - Cannot read property 'type' of undefined Angular 9

Question

I am doing some R&D of upgrading from Angular 8 to Angular 9 my application stopped working suddenly. Home page also not displaying. I received many warnings and error message of type undefined. Then I did 3 changes in my tsconfig.jston file by adding as shown below. However, application home page displaying blank. and in the console receiving vendor.js errors with warnings. Someone please help me with this, Thanks!

"noUnusedLocals": false,
"noUnusedParameters":false,
"skipLibCheck": true,

question from:https://stackoverflow.com/questions/65939270/cannot-read-property-type-of-undefined-angular-9

Answer 1

Thanks everyone, @Giannis and @GetOffMyLawn.....there was a problem with Angular 9 IVY... by following settings mentioned in this url for tsconfig, package.json saved a day. Many thanks!

https://levelup.gitconnected.com/upgrade-to-angular-9-within-10-minutes-671c6fd6174b