* Add specific classes with explicit arguments instead of storing
everything in a map.
* Add helpers as extension methods.
* Include an (unused) example of using it.
This can most likely still be improved a lot usability-wise, but this
should be a step in the right direction.
Change-Id: I57fc6e7c1866e0647a019a9514dfe71b8e584d82
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/173726
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>