You are completely correct. I was considering that to be like ocaml, kotlin, scala, etc which transpile to JS. For what it's worth, I think either ocaml or SML

You are completely correct. I was considering that to be like ocaml, kotlin, scala, etc which transpile to JS. For what it's worth, I think either ocaml or SML is far better than dart for compiling to JS, but dart is far better than typescript (and has a more sound type system). It's not a huge wonder that Google apparently uses angular-dart instead of the typescript version.