zlacker

You need to look back at the history of Dart. It was created by the Chrome team, with many of the people who worked on GWT taking part on it. It was created to solve Google's issues with JavaScript. This endeavor failed as no other browser makers picked it up.

We then got AngularJs, but with Dart (AngularDart). This was again trying to improve the coding experience of making web apps.

When typescript came and the Angular team picked that up, TS seems to be the primary path forward (though angulardart is still getting updated).

At this point dart wasn't seeing a lot of attention. The Flutter team was able to pick up Dart as the primary owner and has been driving it since then.