I have had issues with angulardart. Version 4.0.0 is no longer supported, and Version 5.0.0, which is alpha, broke with different new versions of the dart SDK. With Homebrew it can be very complicated to install older versions. I got directed to following link, which contains older versions:
https://www.dartlang.org/tools/sdk/archive
If you have the version, in /usr/local/Cellar, then you can use the "brew switch 2.0.0-dev.60.0" for example.
