@fusho-takahashi thanks for creating the PR. I'm curious what is the main motivation of adding those types? Is that mostly for consistency purposes with other methods on those classes? Thank you.

@AndrewKushnir Thank you for your comment.
Because when I did 'Tour of Heroes' in Angular version 12, There was a difference between the code generated by Angular CLI and example code.

@fusho-takahashi thanks for additional information. Could you please let me know which CLI commands you've used (so I can reproduce the problem)? Thank you.

@AndrewKushnir
I used following CLI commands. thank you.

npx @angular/cli@12 new angular-tour-of-heroes
cd angular-tour-of-heroes/
npx ng generate component heroes

ref. https://angular.io/tutorial/toh-pt1

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