Replace dart_core.js with actual compiled SDK

lib/runtime/dart/async.js

 var async;
 (function(exports) {
   'use strict';
   // Function _invokeErrorHandler: (Function, Object, StackTrace) → dynamic
   function _invokeErrorHandler(errorHandler, error, stackTrace) {
     if (dart.is(errorHandler, ZoneBinaryCallback)) {
       return dart.dinvokef(errorHandler, error, stackTrace);
     } else {
       return dart.dinvokef(errorHandler, error);
     }
@@ skipping 106 matching lines @@
           }).bind(this)});
         return controller.stream;
       }
       Stream$eventTransformed(source, mapSink) {
         return dart.as(new _BoundSinkStream(source, dart.closureWrap(mapSink, "(EventSink<dynamic>) → EventSink")), Stream$(T));
       }
       get isBroadcast() {
         return false;
       }
       asBroadcastStream(opt$) {
-        let onListen = opt$.onListen === void 0 ? null : opt$.onListen;
-        let onCancel = opt$.onCancel === void 0 ? null : opt$.onCancel;
+        let onListen = opt$ && 'onListen' in opt$ ? opt$.onListen : null;
+        let onCancel = opt$ && 'onCancel' in opt$ ? opt$.onCancel : null;
         return new _AsBroadcastStream(this, dart.closureWrap(onListen, "(StreamSubscription<dynamic>) → void"), dart.closureWrap(onCancel, "(StreamSubscription<dynamic>) → void"));
       }
       where(test) {
         return new _WhereStream(this, test);
       }
       map(convert) {
         return new _MapStream(this, convert);
       }
       asyncMap(convert) {
         let controller = null;
@@ skipping 69 matching lines @@
               subscription.pause();
             }).bind(this), onResume: (() => {
               subscription.resume();
             }).bind(this), onCancel: (() => {
               subscription.cancel();
             }).bind(this), sync: true});
         }
         return controller.stream;
       }
       handleError(onError, opt$) {
-        let test = opt$.test === void 0 ? null : opt$.test;
+        let test = opt$ && 'test' in opt$ ? opt$.test : null;
         return new _HandleErrorStream(this, onError, test);
       }
       expand(convert) {
         return new _ExpandStream(this, convert);
       }
       pipe(streamConsumer) {
         return streamConsumer.addStream(this).then(((_) => streamConsumer.close()).bind(this));
       }
       transform(streamTransformer) {
         return streamTransformer.bind(this);
@@ skipping 253 matching lines @@
               throw _internal.IterableElementError.noElement();
             } catch (e) {
               let s = dart.stackTrace(e);
               _completeWithErrorCallback(future, e, s);
             }
 
           }).bind(this), cancelOnError: true});
         return future;
       }
       firstWhere(test, opt$) {
-        let defaultValue = opt$.defaultValue === void 0 ? null : opt$.defaultValue;
+        let defaultValue = opt$ && 'defaultValue' in opt$ ? opt$.defaultValue : null;
         let future = new _Future();
         let subscription = null;
         subscription = this.listen((value) => {
           _runUserCode(() => test(value), (isMatch) => {
             if (isMatch) {
               _cancelAndValue(subscription, future, value);
             }
           }, dart.as(_cancelAndErrorClosure(subscription, future), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
         }, {onError: future[_completeError], onDone: (() => {
             if (defaultValue !== null) {
               _runUserCode(defaultValue, future[_complete], future[_completeError]);
               return;
             }
             try {
               throw _internal.IterableElementError.noElement();
             } catch (e) {
               let s = dart.stackTrace(e);
               _completeWithErrorCallback(future, e, s);
             }
 
           }).bind(this), cancelOnError: true});
         return future;
       }
       lastWhere(test, opt$) {
-        let defaultValue = opt$.defaultValue === void 0 ? null : opt$.defaultValue;
+        let defaultValue = opt$ && 'defaultValue' in opt$ ? opt$.defaultValue : null;
         let future = new _Future();
         let result = null;
         let foundResult = false;
         let subscription = null;
         subscription = this.listen((value) => {
           _runUserCode(() => true === test(value), (isMatch) => {
             if (isMatch) {
               foundResult = true;
               result = value;
             }
@@ skipping 65 matching lines @@
             _cancelAndValue(subscription, future, value);
             return;
           }
           elementIndex = 1;
         }, {onError: future[_completeError], onDone: (() => {
             future._completeError(new core.RangeError.index(index, this, "index", null, elementIndex));
           }).bind(this), cancelOnError: true});
         return future;
       }
       timeout(timeLimit, opt$) {
-        let onTimeout = opt$.onTimeout === void 0 ? null : opt$.onTimeout;
+        let onTimeout = opt$ && 'onTimeout' in opt$ ? opt$.onTimeout : null;
         let controller = null;
         let subscription = null;
         let timer = null;
         let zone = null;
         let timeout = null;
         // Function onData: (T) → void
         function onData(event) {
           timer.cancel();
           controller.add(event);
           timer = zone.createTimer(timeLimit, dart.as(timeout, dart.throw_("Unimplemented type () → void")));
@@ skipping 50 matching lines @@
     dart.defineNamedConstructor(Stream, 'fromFuture');
     dart.defineNamedConstructor(Stream, 'fromIterable');
     dart.defineNamedConstructor(Stream, 'periodic');
     dart.defineNamedConstructor(Stream, 'eventTransformed');
     return Stream;
   });
   let Stream = Stream$(dart.dynamic);
   let _StreamImpl$ = dart.generic(function(T) {
     class _StreamImpl extends Stream$(T) {
       listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
+        let onError = opt$ && 'onError' in opt$ ? opt$.onError : null;
+        let onDone = opt$ && 'onDone' in opt$ ? opt$.onDone : null;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : null;
         cancelOnError = core.identical(true, cancelOnError);
         let subscription = this[_createSubscription](onData, onError, onDone, cancelOnError);
         this[_onListen](subscription);
         return dart.as(subscription, StreamSubscription$(T));
       }
       [_createSubscription](onData, onError, onDone, cancelOnError) {
         return new _BufferingStreamSubscription(onData, onError, onDone, cancelOnError);
       }
       [_onListen](subscription) {}
     }
@@ skipping 594 matching lines @@
           throw this[_addEventError]();
         this[_state] = _BroadcastStreamController._STATE_CLOSED;
         let doneFuture = this[_ensureDoneFuture]();
         this[_sendDone]();
         return doneFuture;
       }
       get done() {
         return this[_ensureDoneFuture]();
       }
       addStream(stream, opt$) {
-        let cancelOnError = opt$.cancelOnError === void 0 ? true : opt$.cancelOnError;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : true;
         if (!dart.notNull(this[_mayAddEvent]))
           throw this[_addEventError]();
         this[_state] = _BroadcastStreamController._STATE_ADDSTREAM;
         this[_addStreamState] = dart.as(new _AddStreamState(this, stream, cancelOnError), _AddStreamState$(T));
         return this[_addStreamState].addStreamFuture;
       }
       [_add](data) {
         this[_sendData](data);
       }
       [_addError](error, stackTrace) {
@@ skipping 224 matching lines @@
         if (value === void 0)
           value = null;
         return new _Future();
       }
     }
     return _DoneSubscription;
   });
   let _DoneSubscription = _DoneSubscription$(dart.dynamic);
   class DeferredLibrary extends core.Object {
     DeferredLibrary(libraryName, opt$) {
-      let uri = opt$.uri === void 0 ? null : opt$.uri;
+      let uri = opt$ && 'uri' in opt$ ? opt$.uri : null;
       this.libraryName = libraryName;
       this.uri = uri;
     }
     load() {
       throw 'DeferredLibrary not supported. ' + 'please use the `import "lib.dart" deferred as lib` syntax.';
     }
   }
   let _s = Symbol('_s');
   class DeferredLoadException extends core.Object {
     DeferredLoadException($_s) {
@@ skipping 68 matching lines @@
             result._complete(computation === null ? null : computation());
           } catch (e) {
             let s = dart.stackTrace(e);
             _completeWithErrorCallback(result, e, s);
           }
 
         }).bind(this));
         return dart.as(result, Future$(T));
       }
       static wait(futures, opt$) {
-        let eagerError = opt$.eagerError === void 0 ? false : opt$.eagerError;
-        let cleanUp = opt$.cleanUp === void 0 ? null : opt$.cleanUp;
+        let eagerError = opt$ && 'eagerError' in opt$ ? opt$.eagerError : false;
+        let cleanUp = opt$ && 'cleanUp' in opt$ ? opt$.cleanUp : null;
         let result = new _Future();
         let values = null;
         let remaining = 0;
         let error = null;
         let stackTrace = null;
         // Function handleError: (dynamic, dynamic) → void
         function handleError(theError, theStackTrace) {
           remaining = dart.notNull(remaining) - 1;
           if (values !== null) {
             if (cleanUp !== null) {
@@ skipping 312 matching lines @@
       set [_isChained](value) {
         if (value) {
           dart.assert(!dart.notNull(this[_isComplete]));
           this[_state] = _Future._CHAINED;
         } else {
           dart.assert(this[_isChained]);
           this[_state] = _Future._INCOMPLETE;
         }
       }
       then(f, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
+        let onError = opt$ && 'onError' in opt$ ? opt$.onError : null;
         let result = new _Future();
         if (!dart.notNull(core.identical(result[_zone], _ROOT_ZONE))) {
           f = dart.closureWrap(result[_zone].registerUnaryCallback(f), "(T) → dynamic");
           if (onError !== null) {
             onError = _registerErrorHandler(onError, result[_zone]);
           }
         }
         this[_addListener](new _FutureListener.then(result, f, onError));
         return result;
       }
       catchError(onError, opt$) {
-        let test = opt$.test === void 0 ? null : opt$.test;
+        let test = opt$ && 'test' in opt$ ? opt$.test : null;
         let result = new _Future();
         if (!dart.notNull(core.identical(result[_zone], _ROOT_ZONE))) {
           onError = _registerErrorHandler(onError, result[_zone]);
           if (test !== null)
             test = dart.closureWrap(result[_zone].registerUnaryCallback(test), "(dynamic) → bool");
         }
         this[_addListener](new _FutureListener.catchError(result, onError, test));
         return result;
       }
       whenComplete(action) {
@@ skipping 299 matching lines @@
           if (listenerHasValue) {
             result._setValue(listenerValueOrError);
           } else {
             let asyncError = dart.as(listenerValueOrError, AsyncError);
             result._setErrorObject(asyncError);
           }
           source = result;
         }
       }
       timeout(timeLimit, opt$) {
-        let onTimeout = opt$.onTimeout === void 0 ? null : opt$.onTimeout;
+        let onTimeout = opt$ && 'onTimeout' in opt$ ? opt$.onTimeout : null;
         if (this[_isComplete])
           return new _Future.immediate(this);
         let result = new _Future();
         let timer = null;
         if (onTimeout === null) {
           timer = new Timer(timeLimit, (() => {
             result._completeError(new TimeoutException("Future not completed", timeLimit));
           }).bind(this));
         } else {
           let zone = Zone.current;
@@ skipping 188 matching lines @@
   let StreamView$ = dart.generic(function(T) {
     class StreamView extends Stream$(T) {
       StreamView($_stream) {
         this[_stream] = $_stream;
         super.Stream();
       }
       get isBroadcast() {
         return this[_stream].isBroadcast;
       }
       asBroadcastStream(opt$) {
-        let onListen = opt$.onListen === void 0 ? null : opt$.onListen;
-        let onCancel = opt$.onCancel === void 0 ? null : opt$.onCancel;
+        let onListen = opt$ && 'onListen' in opt$ ? opt$.onListen : null;
+        let onCancel = opt$ && 'onCancel' in opt$ ? opt$.onCancel : null;
         return this[_stream].asBroadcastStream({onListen: onListen, onCancel: onCancel});
       }
       listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
+        let onError = opt$ && 'onError' in opt$ ? opt$.onError : null;
+        let onDone = opt$ && 'onDone' in opt$ ? opt$.onDone : null;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : null;
         return this[_stream].listen(onData, {onError: onError, onDone: onDone, cancelOnError: cancelOnError});
       }
     }
     return StreamView;
   });
   let StreamView = StreamView$(dart.dynamic);
   let StreamConsumer$ = dart.generic(function(S) {
     class StreamConsumer extends core.Object {
     }
     return StreamConsumer;
@@ skipping 43 matching lines @@
       close() {
         this[_sink].close();
       }
     }
     return _ControllerEventSinkWrapper;
   });
   let _ControllerEventSinkWrapper = _ControllerEventSinkWrapper$(dart.dynamic);
   let StreamController$ = dart.generic(function(T) {
     class StreamController extends core.Object {
       StreamController(opt$) {
-        let onListen = opt$.onListen === void 0 ? null : opt$.onListen;
-        let onPause = opt$.onPause === void 0 ? null : opt$.onPause;
-        let onResume = opt$.onResume === void 0 ? null : opt$.onResume;
-        let onCancel = opt$.onCancel === void 0 ? null : opt$.onCancel;
-        let sync = opt$.sync === void 0 ? false : opt$.sync;
+        let onListen = opt$ && 'onListen' in opt$ ? opt$.onListen : null;
+        let onPause = opt$ && 'onPause' in opt$ ? opt$.onPause : null;
+        let onResume = opt$ && 'onResume' in opt$ ? opt$.onResume : null;
+        let onCancel = opt$ && 'onCancel' in opt$ ? opt$.onCancel : null;
+        let sync = opt$ && 'sync' in opt$ ? opt$.sync : false;
         if (dart.notNull(onListen === null) && dart.notNull(onPause === null) && dart.notNull(onResume === null) && dart.notNull(onCancel === null)) {
           return dart.as(sync ? new _NoCallbackSyncStreamController() : new _NoCallbackAsyncStreamController(), StreamController$(T));
         }
         return sync ? new _SyncStreamController(onListen, onPause, onResume, onCancel) : new _AsyncStreamController(onListen, onPause, onResume, onCancel);
       }
       StreamController$broadcast(opt$) {
-        let onListen = opt$.onListen === void 0 ? null : opt$.onListen;
-        let onCancel = opt$.onCancel === void 0 ? null : opt$.onCancel;
-        let sync = opt$.sync === void 0 ? false : opt$.sync;
+        let onListen = opt$ && 'onListen' in opt$ ? opt$.onListen : null;
+        let onCancel = opt$ && 'onCancel' in opt$ ? opt$.onCancel : null;
+        let sync = opt$ && 'sync' in opt$ ? opt$.sync : false;
         return sync ? new _SyncBroadcastStreamController(onListen, onCancel) : new _AsyncBroadcastStreamController(onListen, onCancel);
       }
     }
     dart.defineNamedConstructor(StreamController, 'broadcast');
     return StreamController;
   });
   let StreamController = StreamController$(dart.dynamic);
   let _StreamControllerLifecycle$ = dart.generic(function(T) {
     class _StreamControllerLifecycle extends core.Object {
       [_recordPause](subscription) {}
@@ skipping 76 matching lines @@
         return dart.as(this[_varData], _ControllerSubscription);
       }
       [_badEventState]() {
         if (this.isClosed) {
           return new core.StateError("Cannot add event after closing");
         }
         dart.assert(this[_isAddingStream]);
         return new core.StateError("Cannot add event while adding a stream");
       }
       addStream(source, opt$) {
-        let cancelOnError = opt$.cancelOnError === void 0 ? true : opt$.cancelOnError;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : true;
         if (!dart.notNull(this[_mayAddEvent]))
           throw this[_badEventState]();
         if (this[_isCanceled])
           return new _Future.immediate(null);
         let addState = new _StreamControllerAddStreamState(this, this[_varData], source, cancelOnError);
         this[_varData] = addState;
         this[_state] = _StreamController._STATE_ADDSTREAM;
         return addState.addStreamFuture;
       }
       get done() {
@@ skipping 242 matching lines @@
       }
       addError(error, stackTrace) {
         if (stackTrace === void 0)
           stackTrace = null;
         this[_target].addError(error, stackTrace);
       }
       close() {
         return this[_target].close();
       }
       addStream(source, opt$) {
-        let cancelOnError = opt$.cancelOnError === void 0 ? true : opt$.cancelOnError;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : true;
         return this[_target].addStream(source, {cancelOnError: cancelOnError});
       }
       get done() {
         return this[_target].done;
       }
     }
     return _StreamSinkWrapper;
   });
   let _StreamSinkWrapper = _StreamSinkWrapper$(dart.dynamic);
   let _AddStreamState$ = dart.generic(function(T) {
@@ skipping 347 matching lines @@
         this[_zone] = Zone.current;
         this[_controller] = null;
         this[_subscription] = null;
         super.Stream();
         this[_controller] = new _AsBroadcastStreamController(this[_onListen], this[_onCancel]);
       }
       get isBroadcast() {
         return true;
       }
       listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
+        let onError = opt$ && 'onError' in opt$ ? opt$.onError : null;
+        let onDone = opt$ && 'onDone' in opt$ ? opt$.onDone : null;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : null;
         if (dart.notNull(this[_controller] === null) || dart.notNull(this[_controller].isClosed)) {
           return new _DoneStreamSubscription(onDone);
         }
         if (this[_subscription] === null) {
           this[_subscription] = this[_source].listen(this[_controller].add, {onError: this[_controller].addError, onDone: this[_controller].close});
         }
         cancelOnError = core.identical(true, cancelOnError);
         return this[_controller]._subscribe(onData, onError, onDone, cancelOnError);
       }
       [_onCancel]() {
@@ skipping 244 matching lines @@
   let _ForwardingStream$ = dart.generic(function(S, T) {
     class _ForwardingStream extends Stream$(T) {
       _ForwardingStream($_source) {
         this[_source] = $_source;
         super.Stream();
       }
       get isBroadcast() {
         return this[_source].isBroadcast;
       }
       listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
+        let onError = opt$ && 'onError' in opt$ ? opt$.onError : null;
+        let onDone = opt$ && 'onDone' in opt$ ? opt$.onDone : null;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : null;
         cancelOnError = core.identical(true, cancelOnError);
         return this[_createSubscription](onData, onError, onDone, cancelOnError);
       }
       [_createSubscription](onData, onError, onDone, cancelOnError) {
         return new _ForwardingStreamSubscription(this, onData, onError, onDone, cancelOnError);
       }
       [_handleData](data, sink) {
         let outputData = data;
         sink._add(outputData);
       }
@@ skipping 441 matching lines @@
     class _BoundSinkStream extends Stream$(T) {
       get isBroadcast() {
         return this[_stream].isBroadcast;
       }
       _BoundSinkStream($_stream, $_sinkMapper) {
         this[_stream] = $_stream;
         this[_sinkMapper] = $_sinkMapper;
         super.Stream();
       }
       listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
+        let onError = opt$ && 'onError' in opt$ ? opt$.onError : null;
+        let onDone = opt$ && 'onDone' in opt$ ? opt$.onDone : null;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : null;
         cancelOnError = core.identical(true, cancelOnError);
         let subscription = dart.as(new _SinkTransformerStreamSubscription(this[_stream], dart.closureWrap(this[_sinkMapper], "(EventSink<dynamic>) → EventSink"), onData, onError, onDone, cancelOnError), StreamSubscription$(T));
         return subscription;
       }
     }
     return _BoundSinkStream;
   });
   let _BoundSinkStream = _BoundSinkStream$(dart.dynamic, dart.dynamic);
   let _HandlerEventSink$ = dart.generic(function(S, T) {
     class _HandlerEventSink extends core.Object {
@@ skipping 17 matching lines @@
     }
     return _HandlerEventSink;
   });
   let _HandlerEventSink = _HandlerEventSink$(dart.dynamic, dart.dynamic);
   let _defaultHandleData = Symbol('_defaultHandleData');
   let _defaultHandleError = Symbol('_defaultHandleError');
   let _defaultHandleDone = Symbol('_defaultHandleDone');
   let _StreamHandlerTransformer$ = dart.generic(function(S, T) {
     class _StreamHandlerTransformer extends _StreamSinkTransformer$(S, T) {
       _StreamHandlerTransformer(opt$) {
-        let handleData = opt$.handleData === void 0 ? null : opt$.handleData;
-        let handleError = opt$.handleError === void 0 ? null : opt$.handleError;
-        let handleDone = opt$.handleDone === void 0 ? null : opt$.handleDone;
+        let handleData = opt$ && 'handleData' in opt$ ? opt$.handleData : null;
+        let handleError = opt$ && 'handleError' in opt$ ? opt$.handleError : null;
+        let handleDone = opt$ && 'handleDone' in opt$ ? opt$.handleDone : null;
         super._StreamSinkTransformer(dart.closureWrap((outputSink) => {
           if (handleData === null)
             handleData = dart.closureWrap(_defaultHandleData, "(S, EventSink<T>) → void");
           if (handleError === null)
             handleError = dart.closureWrap(_defaultHandleError, "(Object, StackTrace, EventSink<T>) → void");
           if (handleDone === null)
             handleDone = _defaultHandleDone;
           return new _HandlerEventSink(handleData, handleError, handleDone, outputSink);
         }, "(EventSink<T>) → EventSink<S>"));
       }
@@ skipping 27 matching lines @@
   });
   let _StreamSubscriptionTransformer = _StreamSubscriptionTransformer$(dart.dynamic, dart.dynamic);
   let _BoundSubscriptionStream$ = dart.generic(function(S, T) {
     class _BoundSubscriptionStream extends Stream$(T) {
       _BoundSubscriptionStream($_stream, $_transformer) {
         this[_stream] = $_stream;
         this[_transformer] = $_transformer;
         super.Stream();
       }
       listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
+        let onError = opt$ && 'onError' in opt$ ? opt$.onError : null;
+        let onDone = opt$ && 'onDone' in opt$ ? opt$.onDone : null;
+        let cancelOnError = opt$ && 'cancelOnError' in opt$ ? opt$.cancelOnError : null;
         cancelOnError = core.identical(true, cancelOnError);
         let result = this[_transformer](this[_stream], cancelOnError);
         result.onData(onData);
         result.onError(onError);
         result.onDone(onDone);
         return result;
       }
     }
     return _BoundSubscriptionStream;
   });
@@ skipping 34 matching lines @@
     _ZoneFunction(zone, function) {
       this.zone = zone;
       this['function'] = function;
     }
   }
   class ZoneSpecification extends core.Object {
     ZoneSpecification(opt$) {
       return new _ZoneSpecification(opt$);
     }
     ZoneSpecification$from(other, opt$) {
-      let handleUncaughtError = opt$.handleUncaughtError === void 0 ? null : opt$.handleUncaughtError;
-      let run = opt$.run === void 0 ? null : opt$.run;
-      let runUnary = opt$.runUnary === void 0 ? null : opt$.runUnary;
-      let runBinary = opt$.runBinary === void 0 ? null : opt$.runBinary;
-      let registerCallback = opt$.registerCallback === void 0 ? null : opt$.registerCallback;
-      let registerUnaryCallback = opt$.registerUnaryCallback === void 0 ? null : opt$.registerUnaryCallback;
-      let registerBinaryCallback = opt$.registerBinaryCallback === void 0 ? null : opt$.registerBinaryCallback;
-      let errorCallback = opt$.errorCallback === void 0 ? null : opt$.errorCallback;
-      let scheduleMicrotask = opt$.scheduleMicrotask === void 0 ? null : opt$.scheduleMicrotask;
-      let createTimer = opt$.createTimer === void 0 ? null : opt$.createTimer;
-      let createPeriodicTimer = opt$.createPeriodicTimer === void 0 ? null : opt$.createPeriodicTimer;
-      let print = opt$.print === void 0 ? null : opt$.print;
-      let fork = opt$.fork === void 0 ? null : opt$.fork;
+      let handleUncaughtError = opt$ && 'handleUncaughtError' in opt$ ? opt$.handleUncaughtError : null;
+      let run = opt$ && 'run' in opt$ ? opt$.run : null;
+      let runUnary = opt$ && 'runUnary' in opt$ ? opt$.runUnary : null;
+      let runBinary = opt$ && 'runBinary' in opt$ ? opt$.runBinary : null;
+      let registerCallback = opt$ && 'registerCallback' in opt$ ? opt$.registerCallback : null;
+      let registerUnaryCallback = opt$ && 'registerUnaryCallback' in opt$ ? opt$.registerUnaryCallback : null;
+      let registerBinaryCallback = opt$ && 'registerBinaryCallback' in opt$ ? opt$.registerBinaryCallback : null;
+      let errorCallback = opt$ && 'errorCallback' in opt$ ? opt$.errorCallback : null;
+      let scheduleMicrotask = opt$ && 'scheduleMicrotask' in opt$ ? opt$.scheduleMicrotask : null;
+      let createTimer = opt$ && 'createTimer' in opt$ ? opt$.createTimer : null;
+      let createPeriodicTimer = opt$ && 'createPeriodicTimer' in opt$ ? opt$.createPeriodicTimer : null;
+      let print = opt$ && 'print' in opt$ ? opt$.print : null;
+      let fork = opt$ && 'fork' in opt$ ? opt$.fork : null;
       return new ZoneSpecification({handleUncaughtError: dart.as(handleUncaughtError !== null ? handleUncaughtError : other.handleUncaughtError, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, dynamic, StackTrace) → dynamic")), run: dart.as(run !== null ? run : other.run, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, () → dynamic) → dynamic")), runUnary: dart.as(runUnary !== null ? runUnary : other.runUnary, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, (dynamic) → dynamic, dynamic) → dynamic")), runBinary: dart.as(runBinary !== null ? runBinary : other.runBinary, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, (dynamic, dynamic) → dynamic, dynamic, dynamic) → dynamic")), registerCallback: dart.as(registerCallback !== null ? registerCallback : other.registerCallback, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, () → dynamic) → ZoneCallback")), registerUnaryCallback: dart.as(registerUnaryCallback !== null ? registerUnaryCallback : other.registerUnaryCallback, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, (dynamic) → dynamic) → ZoneUnaryCallback")), registerBinaryCallback: dart.as(registerBinaryCallback !== null ? registerBinaryCallback : other.registerBinaryCallback, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, (dynamic, dynamic) → dynamic) → ZoneBinaryCallback")), errorCallback: dart.as(errorCallback !== null ? errorCallback : other.errorCallback, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, Object, StackTrace) → AsyncError")), scheduleMicrotask: dart.as(scheduleMicrotask !== null ? scheduleMicrotask : other.scheduleMicrotask, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, () → dynamic) → void")), createTimer: dart.as(createTimer !== null ? createTimer : other.createTimer, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, Duration, () → void) → Timer")), createPeriodicTimer: dart.as(createPeriodicTimer !== null ? createPeriodicTimer : other.createPeriodicTimer, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, Duration, (Timer) → void) → Timer")), print: dart.as(print !== null ? print : other.print, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, String) → void")), fork: dart.as(fork !== null ? fork : other.fork, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, ZoneSpecification, Map<dynamic, dynamic>) → Zone"))});
     }
   }
   dart.defineNamedConstructor(ZoneSpecification, 'from');
   class _ZoneSpecification extends core.Object {
     _ZoneSpecification(opt$) {
-      let handleUncaughtError = opt$.handleUncaughtError === void 0 ? null : opt$.handleUncaughtError;
-      let run = opt$.run === void 0 ? null : opt$.run;
-      let runUnary = opt$.runUnary === void 0 ? null : opt$.runUnary;
-      let runBinary = opt$.runBinary === void 0 ? null : opt$.runBinary;
-      let registerCallback = opt$.registerCallback === void 0 ? null : opt$.registerCallback;
-      let registerUnaryCallback = opt$.registerUnaryCallback === void 0 ? null : opt$.registerUnaryCallback;
-      let registerBinaryCallback = opt$.registerBinaryCallback === void 0 ? null : opt$.registerBinaryCallback;
-      let errorCallback = opt$.errorCallback === void 0 ? null : opt$.errorCallback;
-      let scheduleMicrotask = opt$.scheduleMicrotask === void 0 ? null : opt$.scheduleMicrotask;
-      let createTimer = opt$.createTimer === void 0 ? null : opt$.createTimer;
-      let createPeriodicTimer = opt$.createPeriodicTimer === void 0 ? null : opt$.createPeriodicTimer;
-      let print = opt$.print === void 0 ? null : opt$.print;
-      let fork = opt$.fork === void 0 ? null : opt$.fork;
+      let handleUncaughtError = opt$ && 'handleUncaughtError' in opt$ ? opt$.handleUncaughtError : null;
+      let run = opt$ && 'run' in opt$ ? opt$.run : null;
+      let runUnary = opt$ && 'runUnary' in opt$ ? opt$.runUnary : null;
+      let runBinary = opt$ && 'runBinary' in opt$ ? opt$.runBinary : null;
+      let registerCallback = opt$ && 'registerCallback' in opt$ ? opt$.registerCallback : null;
+      let registerUnaryCallback = opt$ && 'registerUnaryCallback' in opt$ ? opt$.registerUnaryCallback : null;
+      let registerBinaryCallback = opt$ && 'registerBinaryCallback' in opt$ ? opt$.registerBinaryCallback : null;
+      let errorCallback = opt$ && 'errorCallback' in opt$ ? opt$.errorCallback : null;
+      let scheduleMicrotask = opt$ && 'scheduleMicrotask' in opt$ ? opt$.scheduleMicrotask : null;
+      let createTimer = opt$ && 'createTimer' in opt$ ? opt$.createTimer : null;
+      let createPeriodicTimer = opt$ && 'createPeriodicTimer' in opt$ ? opt$.createPeriodicTimer : null;
+      let print = opt$ && 'print' in opt$ ? opt$.print : null;
+      let fork = opt$ && 'fork' in opt$ ? opt$.fork : null;
       this.handleUncaughtError = handleUncaughtError;
       this.run = run;
       this.runUnary = runUnary;
       this.runBinary = runBinary;
       this.registerCallback = registerCallback;
       this.registerUnaryCallback = registerUnaryCallback;
       this.registerBinaryCallback = registerBinaryCallback;
       this.errorCallback = errorCallback;
       this.scheduleMicrotask = scheduleMicrotask;
       this.createTimer = createTimer;
@@ skipping 190 matching lines @@
     runBinaryGuarded(f, arg1, arg2) {
       try {
         return this.runBinary(f, arg1, arg2);
       } catch (e) {
         let s = dart.stackTrace(e);
         return this.handleUncaughtError(e, s);
       }
 
     }
     bindCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
+      let runGuarded = opt$ && 'runGuarded' in opt$ ? opt$.runGuarded : true;
       let registered = this.registerCallback(f);
       if (runGuarded) {
         return (() => this.runGuarded(registered)).bind(this);
       } else {
         return (() => this.run(registered)).bind(this);
       }
     }
     bindUnaryCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
+      let runGuarded = opt$ && 'runGuarded' in opt$ ? opt$.runGuarded : true;
       let registered = this.registerUnaryCallback(f);
       if (runGuarded) {
         return ((arg) => this.runUnaryGuarded(registered, arg)).bind(this);
       } else {
         return ((arg) => this.runUnary(registered, arg)).bind(this);
       }
     }
     bindBinaryCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
+      let runGuarded = opt$ && 'runGuarded' in opt$ ? opt$.runGuarded : true;
       let registered = this.registerBinaryCallback(f);
       if (runGuarded) {
         return ((arg1, arg2) => this.runBinaryGuarded(registered, arg1, arg2)).bind(this);
       } else {
         return ((arg1, arg2) => this.runBinary(registered, arg1, arg2)).bind(this);
       }
     }
     get(key) {
       let result = this[_map].get(key);
       if (dart.notNull(result !== null) || dart.notNull(this[_map].containsKey(key)))
         return result;
       if (this.parent !== null) {
         let value = this.parent.get(key);
         if (value !== null) {
           this[_map].set(key, value);
         }
         return value;
       }
       dart.assert(dart.equals(this, _ROOT_ZONE));
       return null;
     }
     handleUncaughtError(error, stackTrace) {
       let implementation = this[_handleUncaughtError];
       dart.assert(implementation !== null);
       let parentDelegate = _parentDelegate(implementation.zone);
       return dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, error, stackTrace);
     }
     fork(opt$) {
-      let specification = opt$.specification === void 0 ? null : opt$.specification;
-      let zoneValues = opt$.zoneValues === void 0 ? null : opt$.zoneValues;
+      let specification = opt$ && 'specification' in opt$ ? opt$.specification : null;
+      let zoneValues = opt$ && 'zoneValues' in opt$ ? opt$.zoneValues : null;
       let implementation = this[_fork];
       dart.assert(implementation !== null);
       let parentDelegate = _parentDelegate(implementation.zone);
       return dart.as(dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, specification, zoneValues), Zone);
     }
     run(f) {
       let implementation = this[_run];
       dart.assert(implementation !== null);
       let parentDelegate = _parentDelegate(implementation.zone);
       return dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, f);
@@ skipping 295 matching lines @@
           return dart.dinvokef(f, arg1, arg2);
         }
         return _rootRunBinary(null, null, this, f, arg1, arg2);
       } catch (e) {
         let s = dart.stackTrace(e);
         return this.handleUncaughtError(e, s);
       }
 
     }
     bindCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
+      let runGuarded = opt$ && 'runGuarded' in opt$ ? opt$.runGuarded : true;
       if (runGuarded) {
         return (() => this.runGuarded(f)).bind(this);
       } else {
         return (() => this.run(f)).bind(this);
       }
     }
     bindUnaryCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
+      let runGuarded = opt$ && 'runGuarded' in opt$ ? opt$.runGuarded : true;
       if (runGuarded) {
         return ((arg) => this.runUnaryGuarded(f, arg)).bind(this);
       } else {
         return ((arg) => this.runUnary(f, arg)).bind(this);
       }
     }
     bindBinaryCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
+      let runGuarded = opt$ && 'runGuarded' in opt$ ? opt$.runGuarded : true;
       if (runGuarded) {
         return ((arg1, arg2) => this.runBinaryGuarded(f, arg1, arg2)).bind(this);
       } else {
         return ((arg1, arg2) => this.runBinary(f, arg1, arg2)).bind(this);
       }
     }
     get(key) {
       return null;
     }
     handleUncaughtError(error, stackTrace) {
       return _rootHandleUncaughtError(null, null, this, error, stackTrace);
     }
     fork(opt$) {
-      let specification = opt$.specification === void 0 ? null : opt$.specification;
-      let zoneValues = opt$.zoneValues === void 0 ? null : opt$.zoneValues;
+      let specification = opt$ && 'specification' in opt$ ? opt$.specification : null;
+      let zoneValues = opt$ && 'zoneValues' in opt$ ? opt$.zoneValues : null;
       return _rootFork(null, null, this, specification, zoneValues);
     }
     run(f) {
       if (core.identical(Zone[_current], _ROOT_ZONE))
         return f();
       return _rootRun(null, null, this, f);
     }
     runUnary(f, arg) {
       if (core.identical(Zone[_current], _ROOT_ZONE))
         return dart.dinvokef(f, arg);
@@ skipping 32 matching lines @@
   _RootZone._rootDelegate = null;
   dart.defineLazyProperties(_RootZone, {
     get _rootMap() {
       return new collection.HashMap();
     },
     set _rootMap(_) {}
   });
   let _ROOT_ZONE = new _RootZone();
   // Function runZoned: (() → dynamic, {zoneValues: Map<dynamic, dynamic>, zoneSpecification: ZoneSpecification, onError: Function}) → dynamic
   function runZoned(body, opt$) {
-    let zoneValues = opt$.zoneValues === void 0 ? null : opt$.zoneValues;
-    let zoneSpecification = opt$.zoneSpecification === void 0 ? null : opt$.zoneSpecification;
-    let onError = opt$.onError === void 0 ? null : opt$.onError;
+    let zoneValues = opt$ && 'zoneValues' in opt$ ? opt$.zoneValues : null;
+    let zoneSpecification = opt$ && 'zoneSpecification' in opt$ ? opt$.zoneSpecification : null;
+    let onError = opt$ && 'onError' in opt$ ? opt$.onError : null;
     let errorHandler = null;
     if (onError !== null) {
       errorHandler = (self, parent, zone, error, stackTrace) => {
         try {
           if (dart.is(onError, ZoneBinaryCallback)) {
             return self.parent.runBinary(onError, error, stackTrace);
           }
           return self.parent.runUnary(dart.as(onError, dart.throw_("Unimplemented type (dynamic) → dynamic")), error);
         } catch (e) {
           let s = dart.stackTrace(e);
@@ skipping 50 matching lines @@
   exports.StreamIterator = StreamIterator;
   exports.StreamIterator$ = StreamIterator$;
   exports.StreamController = StreamController;
   exports.StreamController$ = StreamController$;
   exports.Timer = Timer;
   exports.ZoneSpecification = ZoneSpecification;
   exports.ZoneDelegate = ZoneDelegate;
   exports.Zone = Zone;
   exports.runZoned = runZoned;
 })(async || (async = {}));