Add --modules=node support

lib/runtime/dart/_internal.js

Index: lib/runtime/dart/_internal.js
diff --git a/lib/runtime/dart/_internal.js b/lib/runtime/dart/_internal.js
index 4ee7fd170ee949803e42514ecdf9cffc618e56bf..133766c100e5580626f52fe2b05a058d6a5f7eec 100644
--- a/lib/runtime/dart/_internal.js
+++ b/lib/runtime/dart/_internal.js
@@ -274,7 +274,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     ]);
     return ListIterable;
   });
-  let ListIterable = ListIterable$();
+  const ListIterable = ListIterable$();
   const _iterable = dart.JsSymbol('_iterable');
   const _start = dart.JsSymbol('_start');
   const _endOrLength = dart.JsSymbol('_endOrLength');
@@ -375,7 +375,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     ]);
     return SubListIterable;
   });
-  let SubListIterable = SubListIterable$();
+  const SubListIterable = SubListIterable$();
   const _length = dart.JsSymbol('_length');
   const _index = dart.JsSymbol('_index');
   const _current = dart.JsSymbol('_current');
@@ -411,12 +411,12 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return ListIterator;
   });
-  let ListIterator = ListIterator$();
+  const ListIterator = ListIterator$();
   const _Transformation$ = dart.generic(function(S, T) {
     const _Transformation = dart.typedef('_Transformation', () => dart.functionType(T, [S]));
     return _Transformation;
   });
-  let _Transformation = _Transformation$();
+  const _Transformation = _Transformation$();
   const _f = dart.JsSymbol('_f');
   const MappedIterable$ = dart.generic(function(S, T) {
     class MappedIterable extends collection.IterableBase$(T) {
@@ -472,7 +472,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     ]);
     return MappedIterable;
   });
-  let MappedIterable = MappedIterable$();
+  const MappedIterable = MappedIterable$();
   const EfficientLengthMappedIterable$ = dart.generic(function(S, T) {
     class EfficientLengthMappedIterable extends MappedIterable$(S, T) {
       EfficientLengthMappedIterable(iterable, func) {
@@ -485,7 +485,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return EfficientLengthMappedIterable;
   });
-  let EfficientLengthMappedIterable = EfficientLengthMappedIterable$();
+  const EfficientLengthMappedIterable = EfficientLengthMappedIterable$();
   const _iterator = dart.JsSymbol('_iterator');
   const MappedIterator$ = dart.generic(function(S, T) {
     class MappedIterator extends core.Iterator$(T) {
@@ -512,7 +512,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return MappedIterator;
   });
-  let MappedIterator = MappedIterator$();
+  const MappedIterator = MappedIterator$();
   const _source = dart.JsSymbol('_source');
   const MappedListIterable$ = dart.generic(function(S, T) {
     class MappedListIterable extends ListIterable$(T) {
@@ -536,12 +536,12 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(MappedListIterable, ['elementAt', 'length']);
     return MappedListIterable;
   });
-  let MappedListIterable = MappedListIterable$();
+  const MappedListIterable = MappedListIterable$();
   const _ElementPredicate$ = dart.generic(function(E) {
     const _ElementPredicate = dart.typedef('_ElementPredicate', () => dart.functionType(core.bool, [E]));
     return _ElementPredicate;
   });
-  let _ElementPredicate = _ElementPredicate$();
+  const _ElementPredicate = _ElementPredicate$();
   const WhereIterable$ = dart.generic(function(E) {
     class WhereIterable extends collection.IterableBase$(E) {
       WhereIterable(iterable, f) {
@@ -559,7 +559,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(WhereIterable, ['iterator']);
     return WhereIterable;
   });
-  let WhereIterable = WhereIterable$();
+  const WhereIterable = WhereIterable$();
   const WhereIterator$ = dart.generic(function(E) {
     class WhereIterator extends core.Iterator$(E) {
       WhereIterator(iterator, f) {
@@ -584,12 +584,12 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return WhereIterator;
   });
-  let WhereIterator = WhereIterator$();
+  const WhereIterator = WhereIterator$();
   const _ExpandFunction$ = dart.generic(function(S, T) {
     const _ExpandFunction = dart.typedef('_ExpandFunction', () => dart.functionType(core.Iterable$(T), [S]));
     return _ExpandFunction;
   });
-  let _ExpandFunction = _ExpandFunction$();
+  const _ExpandFunction = _ExpandFunction$();
   const ExpandIterable$ = dart.generic(function(S, T) {
     class ExpandIterable extends collection.IterableBase$(T) {
       ExpandIterable(iterable, f) {
@@ -607,7 +607,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(ExpandIterable, ['iterator']);
     return ExpandIterable;
   });
-  let ExpandIterable = ExpandIterable$();
+  const ExpandIterable = ExpandIterable$();
   const _currentExpansion = dart.JsSymbol('_currentExpansion');
   const _nextExpansion = dart.JsSymbol('_nextExpansion');
   const ExpandIterator$ = dart.generic(function(S, T) {
@@ -647,7 +647,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return ExpandIterator;
   });
-  let ExpandIterator = ExpandIterator$();
+  const ExpandIterator = ExpandIterator$();
   const _takeCount = dart.JsSymbol('_takeCount');
   const TakeIterable$ = dart.generic(function(E) {
     class TakeIterable extends collection.IterableBase$(E) {
@@ -679,7 +679,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(TakeIterable, ['iterator']);
     return TakeIterable;
   });
-  let TakeIterable = TakeIterable$();
+  const TakeIterable = TakeIterable$();
   const EfficientLengthTakeIterable$ = dart.generic(function(E) {
     class EfficientLengthTakeIterable extends TakeIterable$(E) {
       EfficientLengthTakeIterable(iterable, takeCount) {
@@ -698,7 +698,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(EfficientLengthTakeIterable, ['length']);
     return EfficientLengthTakeIterable;
   });
-  let EfficientLengthTakeIterable = EfficientLengthTakeIterable$();
+  const EfficientLengthTakeIterable = EfficientLengthTakeIterable$();
   const _remaining = dart.JsSymbol('_remaining');
   const TakeIterator$ = dart.generic(function(E) {
     class TakeIterator extends core.Iterator$(E) {
@@ -726,7 +726,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return TakeIterator;
   });
-  let TakeIterator = TakeIterator$();
+  const TakeIterator = TakeIterator$();
   const TakeWhileIterable$ = dart.generic(function(E) {
     class TakeWhileIterable extends collection.IterableBase$(E) {
       TakeWhileIterable(iterable, f) {
@@ -744,7 +744,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(TakeWhileIterable, ['iterator']);
     return TakeWhileIterable;
   });
-  let TakeWhileIterable = TakeWhileIterable$();
+  const TakeWhileIterable = TakeWhileIterable$();
   const _isFinished = dart.JsSymbol('_isFinished');
   const TakeWhileIterator$ = dart.generic(function(E) {
     class TakeWhileIterator extends core.Iterator$(E) {
@@ -772,7 +772,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return TakeWhileIterator;
   });
-  let TakeWhileIterator = TakeWhileIterator$();
+  const TakeWhileIterator = TakeWhileIterator$();
   const _skipCount = dart.JsSymbol('_skipCount');
   const SkipIterable$ = dart.generic(function(E) {
     class SkipIterable extends collection.IterableBase$(E) {
@@ -813,7 +813,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(SkipIterable, ['skip', 'iterator']);
     return SkipIterable;
   });
-  let SkipIterable = SkipIterable$();
+  const SkipIterable = SkipIterable$();
   const EfficientLengthSkipIterable$ = dart.generic(function(E) {
     class EfficientLengthSkipIterable extends SkipIterable$(E) {
       EfficientLengthSkipIterable(iterable, skipCount) {
@@ -832,7 +832,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(EfficientLengthSkipIterable, ['length']);
     return EfficientLengthSkipIterable;
   });
-  let EfficientLengthSkipIterable = EfficientLengthSkipIterable$();
+  const EfficientLengthSkipIterable = EfficientLengthSkipIterable$();
   const SkipIterator$ = dart.generic(function(E) {
     class SkipIterator extends core.Iterator$(E) {
       SkipIterator(iterator, skipCount) {
@@ -856,7 +856,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return SkipIterator;
   });
-  let SkipIterator = SkipIterator$();
+  const SkipIterator = SkipIterator$();
   const SkipWhileIterable$ = dart.generic(function(E) {
     class SkipWhileIterable extends collection.IterableBase$(E) {
       SkipWhileIterable(iterable, f) {
@@ -874,7 +874,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(SkipWhileIterable, ['iterator']);
     return SkipWhileIterable;
   });
-  let SkipWhileIterable = SkipWhileIterable$();
+  const SkipWhileIterable = SkipWhileIterable$();
   const _hasSkipped = dart.JsSymbol('_hasSkipped');
   const SkipWhileIterator$ = dart.generic(function(E) {
     class SkipWhileIterator extends core.Iterator$(E) {
@@ -902,7 +902,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return SkipWhileIterator;
   });
-  let SkipWhileIterator = SkipWhileIterator$();
+  const SkipWhileIterator = SkipWhileIterator$();
   const EmptyIterable$ = dart.generic(function(E) {
     class EmptyIterable extends collection.IterableBase$(E) {
       EmptyIterable() {
@@ -1060,7 +1060,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     ]);
     return EmptyIterable;
   });
-  let EmptyIterable = EmptyIterable$();
+  const EmptyIterable = EmptyIterable$();
   const EmptyIterator$ = dart.generic(function(E) {
     class EmptyIterator extends core.Object {
       EmptyIterator() {
@@ -1079,13 +1079,13 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return EmptyIterator;
   });
-  let EmptyIterator = EmptyIterator$();
+  const EmptyIterator = EmptyIterator$();
   const BidirectionalIterator$ = dart.generic(function(T) {
     class BidirectionalIterator extends core.Object {}
     BidirectionalIterator[dart.implements] = () => [core.Iterator$(T)];
     return BidirectionalIterator;
   });
-  let BidirectionalIterator = BidirectionalIterator$();
+  const BidirectionalIterator = BidirectionalIterator$();
   const IterableMixinWorkaround$ = dart.generic(function(T) {
     class IterableMixinWorkaround extends core.Object {
       static contains(iterable, element) {
@@ -1494,7 +1494,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return IterableMixinWorkaround;
   });
-  let IterableMixinWorkaround = IterableMixinWorkaround$();
+  const IterableMixinWorkaround = IterableMixinWorkaround$();
   class IterableElementError extends core.Object {
     static noElement() {
       return new core.StateError("No element");
@@ -1518,12 +1518,12 @@ dart_library.library('dart/_internal', null, /* Imports */[
     const __CastType0 = dart.typedef('__CastType0', () => dart.functionType(core.Iterable$(T), [S]));
     return __CastType0;
   });
-  let __CastType0 = __CastType0$();
+  const __CastType0 = __CastType0$();
   const __CastType2$ = dart.generic(function(T) {
     const __CastType2 = dart.typedef('__CastType2', () => dart.functionType(core.bool, [T]));
     return __CastType2;
   });
-  let __CastType2 = __CastType2$();
+  const __CastType2 = __CastType2$();
   const FixedLengthListMixin$ = dart.generic(function(E) {
     class FixedLengthListMixin extends core.Object {
       set length(newLength) {
@@ -1591,7 +1591,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return FixedLengthListMixin;
   });
-  let FixedLengthListMixin = FixedLengthListMixin$();
+  const FixedLengthListMixin = FixedLengthListMixin$();
   const UnmodifiableListMixin$ = dart.generic(function(E) {
     class UnmodifiableListMixin extends core.Object {
       set(index, value) {
@@ -1715,7 +1715,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     ]);
     return UnmodifiableListMixin;
   });
-  let UnmodifiableListMixin = UnmodifiableListMixin$();
+  const UnmodifiableListMixin = UnmodifiableListMixin$();
   const FixedLengthListBase$ = dart.generic(function(E) {
     class FixedLengthListBase extends dart.mixin(collection.ListBase$(E), FixedLengthListMixin$(E)) {
       FixedLengthListBase() {
@@ -1724,7 +1724,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     }
     return FixedLengthListBase;
   });
-  let FixedLengthListBase = FixedLengthListBase$();
+  const FixedLengthListBase = FixedLengthListBase$();
   const UnmodifiableListBase$ = dart.generic(function(E) {
     class UnmodifiableListBase extends dart.mixin(collection.ListBase$(E), UnmodifiableListMixin$(E)) {
       UnmodifiableListBase() {
@@ -1733,7 +1733,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     }
     return UnmodifiableListBase;
   });
-  let UnmodifiableListBase = UnmodifiableListBase$();
+  const UnmodifiableListBase = UnmodifiableListBase$();
   const _backedList = dart.JsSymbol('_backedList');
   class _ListIndicesIterable extends ListIterable$(core.int) {
     _ListIndicesIterable(backedList) {
@@ -1833,7 +1833,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     });
     return ListMapView;
   });
-  let ListMapView = ListMapView$();
+  const ListMapView = ListMapView$();
   const ReversedListIterable$ = dart.generic(function(E) {
     class ReversedListIterable extends ListIterable$(E) {
       ReversedListIterable(source) {
@@ -1854,7 +1854,7 @@ dart_library.library('dart/_internal', null, /* Imports */[
     dart.defineExtensionMembers(ReversedListIterable, ['elementAt', 'length']);
     return ReversedListIterable;
   });
-  let ReversedListIterable = ReversedListIterable$();
+  const ReversedListIterable = ReversedListIterable$();
   class UnmodifiableListError extends core.Object {
     static add() {
       return new core.UnsupportedError("Cannot add to unmodifiable List");