Support for dart:typed_data

lib/src/codegen/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/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/constant.dart';
 
 bool _isJsLibType(String expectedName, Element e) =>
     e?.name == expectedName && _isJsLib(e.library);
@@ skipping 17 matching lines @@
 
 /// Whether [i] is a `spread` invocation (to be used on function arguments
 /// to have them compiled as `...` spread args in ES6 outputs).
 bool isJsSpreadInvocation(MethodInvocation i) =>
     _isJsLibType('spread', i.methodName?.bestElement);
 
 // TODO(jmesserly): Move JsPeerInterface to package:js (see issue #135).
 bool isJSAnnotation(DartObjectImpl value) =>
     _isJsLibType('JS', value.type.element);
 
+bool _isBuiltinAnnotation(
+    DartObjectImpl value, String libraryName, String annotationName) {
+  var e = value?.type?.element;
+  if (e?.name != annotationName) return false;
+  var uri = e.source.uri;
+  var path = uri.pathSegments[0];
+  return uri.scheme == 'dart' && path == libraryName;
+}
+
 /// Whether [value] is a `@JSExportName` (internal annotation used in SDK
 /// instead of `@JS` from `package:js`).
-bool isJSExportNameAnnotation(DartObjectImpl value) {
-  var e = value?.type?.element;
-  if (e?.name != 'JSExportName') return false;
-  var uri = e.source.uri;
-  return uri.scheme == 'dart' && uri.path == '_foreign_helper';
-}
+bool isJSExportNameAnnotation(DartObjectImpl value) =>
+    _isBuiltinAnnotation(value, '_foreign_helper', 'JSExportName');
+
+bool isJsName(DartObjectImpl value) =>
+    _isBuiltinAnnotation(value, '_js_helper', 'JSName');
 
 bool isJsPeerInterface(DartObjectImpl value) =>
-    value.type.name == 'JsPeerInterface';
+    _isBuiltinAnnotation(value, '_js_helper', 'JsPeerInterface');
+
+bool isNativeAnnotation(DartObjectImpl value) =>
+    _isBuiltinAnnotation(value, '_js_helper', 'Native');