Value at position 0 while updating from Angular 8 to 9

If you want to use font-awesome in angular 9+ you can use this command :

 ng add @fortawesome/angular-fontawesome

Credit goes to FortAwesome

So removing angular-font-awesome using npm uninstall angular-font-awesome and adding new package using ng add @fortawesome/[email protected] and then disabling IVY compiler by adding

"angularCompilerOptions": {
    "enableIvy": false
  }

into tsconfig.app.json and ts.spec.json seems to have solved the issues.