While this is hilarious, it's exactly fair. Dart is still in a very early tech preview, and they clearly haven't optimised code generation yet. Right now, it's

While this is hilarious, it's exactly fair. Dart is still in a very early tech preview, and they clearly haven't optimised code generation yet. Right now, it's probably designed to be run through something like Closure Compiler, which removes dead code and minimizes the output.