A new Dart Editor build is available at www.dartlang.org/editor . Eric Clayberg fills us in on the changes : Semantic highlighting enabled for new analysis engine. New “Convert Method to Getter” and “Convert Getter to Method” refactorings. New “Create Class” and “Create part” quick fixes. New “Import Library” quick fixes. Multiple hover text improvements. Fixed several debugger bugs related to not being able to hit breakpoints. Additional warnings and errors enabled in new analysis engine. Many general improvements and fixes to new analysis engine. Breaking Change List: MirrorSystem.libraries uses Uri instead of library names. LibraryMirror.url changed to LibraryMirror.uri. Rename dart:typeddata to dart:typed_data. As always,view the changelog for the full list of changes, and to get started with the Editor see our tutorial .