Implement modular compilation

lib/src/compiler/js_names.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';
 
-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);
 }
 
 /// Creates a qualified identifier, without determining for sure if it needs to
 /// be qualified until [setQualified] is called.
 ///
 /// This expression is transparent to visiting after [setQualified].
 class MaybeQualifiedId extends Expression {
@@ skipping 263 matching lines @@
 /// In particular, "caller" "callee" and "arguments" cannot be used.
 bool invalidStaticFieldName(String name) {
   switch (name) {
     case "arguments":
     case "caller":
     case "callee":
       return true;
   }
   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);
-}