We need to learn yet another language (Dart)? No thanks.
You can honestly pick it up in a weekend, there's nothing particularly new or groundbreaking.
BTW: I'm working on subset of react-native for desktop (not yet ready) https://github.com/cztomsik/stain/tree/master/src
otherwise I might put some time into it, the Dart decision is unwise to me. Life is too short to get good of so many languages(esp the eco-systems behind each)
Why o why is this not written in a way to support TypeScript?