Sprinkle some types on the SDK like the static typing fairy.

pkg/dev_compiler/lib/src/compiler/code_generator.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1296 matching lines @@
       // Therefore, dart:core Object gets the one real `constructor` and
       // immediately bounces to the `new() { ... }` initializer, letting us
       // bypass the ES6 restrictions.
       //
       // TODO(jmesserly): we'll need to rethink this.
       // See <https://github.com/dart-lang/dev_compiler/issues/51>.
       // This level of indirection will hurt performance.
       jsMethods.add(new JS.Method(
           _propertyName('constructor'),
           js.call('function(...args) { return this.new.apply(this, args); }')
-          as JS.Fun));
+              as JS.Fun));
     } else if (ctors.isEmpty) {
       jsMethods.add(_emitImplicitConstructor(node, fields, virtualFields));
     }
 
     bool hasJsPeer = findAnnotation(element, isJsPeerInterface) != null;
 
     bool hasIterator = false;
     for (var m in node.members) {
       if (m is ConstructorDeclaration) {
         jsMethods
@@ skipping 2632 matching lines @@
       Element target, List<VariableDeclaration> fields) {
     var methods = [];
     for (var node in fields) {
       var name = node.name.name;
       var element = node.element;
       var access = _emitMemberName(name, isStatic: true);
       methods.add(annotate(
           new JS.Method(
               access,
               js.call('function() { return #; }', _visitInitializer(node))
-              as JS.Fun,
+                  as JS.Fun,
               isGetter: true),
           node,
           _findAccessor(element, getter: true)));
 
       // TODO(jmesserly): currently uses a dummy setter to indicate writable.
       if (!node.isFinal && !node.isConst) {
         methods.add(annotate(
             new JS.Method(access, js.call('function(_) {}') as JS.Fun,
                 isSetter: true),
             node,
@@ skipping 539 matching lines @@
           _bindValue(scope, 'o', _getTarget(prop), context: context),
           prop.operator,
           prop.propertyName);
     } else if (expr is PrefixedIdentifier) {
       PrefixedIdentifier ident = expr;
       if (isLibraryPrefix(ident.prefix)) {
         return expr;
       }
       result = new PrefixedIdentifier(
           _bindValue(scope, 'o', ident.prefix, context: context)
-          as SimpleIdentifier,
+              as SimpleIdentifier,
           ident.period,
           ident.identifier);
     } else {
       return expr as SimpleIdentifier;
     }
     result.staticType = expr.staticType;
     setIsDynamicInvoke(result, isDynamicInvoke(expr));
     return result;
   }
 
@@ skipping 1224 matching lines @@
   var targetIdentifier = target as SimpleIdentifier;
 
   if (targetIdentifier.staticElement is! PrefixElement) return false;
   var prefix = targetIdentifier.staticElement as PrefixElement;
 
   // The library the prefix is referring to must come from a deferred import.
   var containingLibrary = (target.root as CompilationUnit).element.library;
   var imports = containingLibrary.getImportsWithPrefix(prefix);
   return imports.length == 1 && imports[0].isDeferred;
 }