AppTree is one of software companies that has moved all of its code to Dart. Android, IOS with flutter and Web. Why? For code sharing and reusing same components accomplishing 70% faster code production.
They are doing amazing job.
https://medium.com/@john.p.ryan4/sharing-code-on-ios-android-and-web-85e8ed7dfccd
https://medium.com/@matthew.smith_66715/why-we-chose-flutter-and-how-its-changed-our-company-for-the-better-271ddd25da60
https://github.com/apptreesoftware/letsvote