Extension Methods Support

• Extension Methods replace Observable class!
• Please upgrade existing code by using the rxdart_codemod package
• Remove the Observable class. With extensions, you no longer need to wrap Streams in a [Stream]!
  • Convert all factories to static constructors to aid in discoverability of Stream classes
  • Move all factories to an Rx class.
  • Remove Observable.just, use Stream.value
  • Remove Observable.error, use Stream.error
  • Remove all tests that check base Stream methods
  • Subjects and *Observable classes extend Stream instead of base Observable
  • Rename *Observable to *Stream to reflect the fact they're just Streams.
    • ValueObservable -> ValueStream
    • ReplayObservable -> ReplayStream
    • ConnectableObservable -> ConnectableStream
    • ValueConnectableObservable -> ValueConnectableStream
    • ReplayConnectableObservable -> ReplayConnectableStream
• All transformation methods removed from Observable class
  • Transformation methods are now Extensions of the Stream class
  • Any Stream can make use of the transformation methods provided by RxDart
  • Observable class remains in place with factory methods to create different types of Streams
  • Removed deprecated ofType method, use whereType instead
  • Deprecated concatMap, use standard Stream asyncExpand.
  • Removed AsObservableFuture, MinFuture, MaxFuture, and WrappedFuture
    • This removes asObservable method in chains
    • Use default asStream method from the base Future class instead.
    • min and max now implemented directly on the Stream class