For Web, I thought AngularDart would be appropriate for code sharing between all apps. But by looking at their github, I'm not sure if it's in active development. On the other hand, Angular looks pretty good for web. But code sharing would be a problem with Flutter. But will be easier with NativeScript.
So, I'm not sure if I should focus on Dart ecosystem or JS/TS ecosystem. Please, share your experience if you been through this process. Thank you!