This file contains highlights of what changes on each version of the polymer_expressions package.
package:polymer_expressions no longer declares @MirrosUsed. The package uses mirrors at development time, but assumes frameworks like polymer will generate code that replaces the use of mirrors. If you use this directly, you might need to do code generation as well, or add the @MirrorsUsed declaration. This can be done either explicitly or by importing the old settings from ‘package:observe/mirrors_used.dart’ (which include @reflectable and @observable by default).
Errors that occur within bindings are now thrown asycnhronously. We used to trap some errors and report them in a Logger, and we would let other errors halt the rendering process. Now all errors are caught, but they are reported asynchornously so they are visible even when logging is not set up.