The op did say they didn't want to do these type of checks.

I thought the answer was 'instanceof'?

https://www.typescriptlang.org/docs/handbook/2/narrowing.htm...

I see what you mean, thanks. instanceof works if you're using javascript classes but not for "types".

You can't do `instanceof Dog`. `instanceof` is a JavaScript feature

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...