Implement modular compilation

lib/src/compiler/js_names.dart

Index: lib/src/compiler/js_names.dart
diff --git a/lib/src/codegen/js_names.dart b/lib/src/compiler/js_names.dart
similarity index 95%
rename from lib/src/codegen/js_names.dart
rename to lib/src/compiler/js_names.dart
index 867d85b0e89bd769a0e6b8348ba11a175f6258fa..5cf311df204a3c508dd9d0d662c6da8c476c381b 100644
--- a/lib/src/codegen/js_names.dart
+++ b/lib/src/compiler/js_names.dart
@@ -4,14 +4,12 @@
 
 import 'dart:collection';
 
-import '../js/js_ast.dart';
-import 'package:dev_compiler/src/options.dart';
+import '../js_ast/js_ast.dart';
 
 /// Unique instance for temporary variables. Will be renamed consistently
 /// across the entire file. Different instances will be named differently
 /// even if they have the same name, this makes it safe to use in code
-/// generation without needing global knowledge. See [JSNamer].
-///
+/// generation without needing global knowledge. See [TemporaryNamer].
 // TODO(jmesserly): move into js_ast? add a boolean to Identifier?
 class TemporaryId extends Identifier {
   TemporaryId(String name) : super(name);
@@ -295,9 +293,3 @@ bool invalidStaticFieldName(String name) {
   }
   return false;
 }
-
-/// We cannot destructure named params that clash with JS reserved names:
-/// see discussion in https://github.com/dart-lang/dev_compiler/issues/392.
-bool canDestructureNamedParams(Iterable<String> names, CodegenOptions options) {
-  return options.destructureNamedParams && !names.any(invalidVariableName);
-}