Update charted to 0.4.8 and roll

packages/quiver/lib/src/async/stream_router.dart

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 part of quiver.async;
 
-/**
- * Splits a [Stream] of events into multiple Streams based on a set of
- * predicates.
- *
- * Using StreamRouter differs from [Stream.where] because events are only sent
- * to one Stream. If more than one predicate matches the event, the event is
- * sent to the stream created by the earlier call to [route]. Events not matched
- * by a call to [route] are sent to the [defaultStream].
- *
- * Example:
- *   import 'dart:html';
- *   import 'package:quiver/async.dart';
- *
- *   var router = new StreamRouter(window.onClick);
- *   var onRightClick = router.route((e) => e.button == 2);
- *   var onAltClick = router.route((e) => e.altKey);
- *   var onOtherClick router.defaultStream;
- */
+/// Splits a [Stream] of events into multiple Streams based on a set of
+/// predicates.
+///
+/// Using StreamRouter differs from [Stream.where] because events are only sent
+/// to one Stream. If more than one predicate matches the event, the event is
+/// sent to the stream created by the earlier call to [route]. Events not
+/// matched by a call to [route] are sent to the [defaultStream].
+///
+/// Example:
+///    import 'dart:html';
+///    import 'package:quiver/async.dart';
+///
+///    var router = new StreamRouter(window.onClick);
+///    var onRightClick = router.route((e) => e.button == 2);
+///    var onAltClick = router.route((e) => e.altKey);
+///    var onOtherClick router.defaultStream;
 class StreamRouter<T> {
   final Stream<T> _incoming;
   StreamSubscription _subscription;
 
-  final List<_Route> _routes = <_Route>[];
+  final List<_Route<T>> _routes = <_Route<T>>[];
   final StreamController<T> _defaultController =
       new StreamController<T>.broadcast();
 
-  /**
-   * Create a new StreamRouter that listens to the [incoming] stream.
-   */
+  /// Create a new StreamRouter that listens to the [incoming] stream.
   StreamRouter(Stream<T> incoming) : _incoming = incoming {
     _subscription = _incoming.listen(_handle, onDone: close);
   }
 
-  /**
-   * Events that match [predicate] are sent to the stream created by this
-   * method, and not sent to any other router streams.
-   */
+  /// Events that match [predicate] are sent to the stream created by this
+  /// method, and not sent to any other router streams.
   Stream<T> route(bool predicate(T event)) {
     var controller = new StreamController<T>.broadcast();
     _routes.add(new _Route(predicate, controller));
     return controller.stream;
   }
 
   Stream<T> get defaultStream => _defaultController.stream;
 
   Future close() {
     return Future.wait(_routes.map((r) => r.controller.close())).then((_) {
       _subscription.cancel();
     });
   }
 
   void _handle(T event) {
     var route =
         _routes.firstWhere((r) => r.predicate(event), orElse: () => null);
     var controller = (route != null) ? route.controller : _defaultController;
     controller.add(event);
   }
 }
 
 typedef bool _Predicate(event);
 
-class _Route {
+class _Route<T> {
   final _Predicate predicate;
-  final StreamController controller;
+  final StreamController<T> controller;
 
   _Route(this.predicate, this.controller);
 }