Implement modular compilation

lib/src/compiler/js_interop.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 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;
 
-import '../utils.dart';
+import 'element_helpers.dart';
 
 bool _isJsLibType(String expectedName, Element e) =>
     e?.name == expectedName && _isJsLib(e.library);
 
 /// Returns true if [e] represents any library from `package:js` or is the
 /// internal `dart:_js_helper` library.
 bool _isJsLib(LibraryElement e) {
   if (e == null) return false;
   var uri = e.source.uri;
   if (uri.scheme == 'package' && uri.path.startsWith('js/')) return true;
@@ skipping 36 matching lines @@
 
 bool isJsPeerInterface(DartObjectImpl value) =>
     _isBuiltinAnnotation(value, '_js_helper', 'JsPeerInterface');
 
 bool isNativeAnnotation(DartObjectImpl value) =>
     _isBuiltinAnnotation(value, '_js_helper', 'Native');
 
 /// Returns the name value of the `JSExportName` annotation (when compiling
 /// the SDK), or `null` if there's none. This is used to control the name
 /// under which functions are compiled and exported.
-String getJSExportName(Element e, TypeProvider types) {
-  if (!e.source.isInSystemLibrary) {
-    return null;
+String getJSExportName(Element e) {
+  if (e.source.isInSystemLibrary) {
+    return getAnnotationName(e, isJSExportNameAnnotation) ?? e.name;
   }
-  var jsName = findAnnotation(e, isJSExportNameAnnotation);
-  return getConstantField(jsName, 'name', types.stringType)?.toStringValue();
+  return e.name;
 }