Earlier quoted context omitted.
Yes, exactly. Interoperable doesn't mean much if it is not properly cross platform. I've tried Dart for a project, and it worked OK, but in my opinion TypeScript is clearly the way to go in the foreseeable future.
Typescript is a safe bet. I think for mobile apps Flutter is a better tech stack than React Native though and can survive if Google doesn’t give up on it.
Another big "no" factor with Flutter for me is that it's its own ecosystem and language; React Native ties in with the greater React ecosystem and the even greater Node ecosystem, which gives you a lot of libraries, code examples, maintenance and improvements. Second, hiring is a major factor. You can assign most current-day web developers onto a RN project with little problems, whereas Flutter is a new language and skill set.