Just to give a counterpoint to this, I love Dart. My preferred language is Ruby and Dart certainly is not Ruby. But it also makes me a bit happy when writing it

Just to give a counterpoint to this, I love Dart. My preferred language is Ruby and Dart certainly is not Ruby. But it also makes me a bit happy when writing it: It's easy to understand and clean enough. The typing system is done well enough that it does not get in the way as much as early Java did. There were very few surprises with Dart. It has limitations (especially when trying to incorporate more functional patterns and felt when working with JSON), but I can work with that. Most of the time I can just write the code I want, organize it as I want and the Code will look as expected. No blockers there. Typescript would not have been a plus for me.