Implement modular compilation

lib/src/compiler/js_interop.dart

Index: lib/src/compiler/js_interop.dart
diff --git a/lib/src/codegen/js_interop.dart b/lib/src/compiler/js_interop.dart
similarity index 88%
rename from lib/src/codegen/js_interop.dart
rename to lib/src/compiler/js_interop.dart
index 0c2178a6629a0f6a5d33595138515b1769127b6b..db0b7833bc25dcb31fd7f23350b0a491fb0f2e73 100644
--- a/lib/src/codegen/js_interop.dart
+++ b/lib/src/compiler/js_interop.dart
@@ -5,9 +5,8 @@
 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);
@@ -64,10 +63,9 @@ bool isNativeAnnotation(DartObjectImpl value) =>
 /// 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;
 }