Implement JsMethodMirror.parameters.

dart/sdk/lib/_internal/lib/js_rti.dart

 // Copyright (c) 2013, 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.
 
 /**
  * This part contains helpers for supporting runtime type information.
  *
  * The helper use a mixture of Dart and JavaScript objects. To indicate which is
  * used where we adopt the scheme of using explicit type annotation for Dart
  * objects and 'var' or omitted return type for JavaScript objects.
@@ skipping 114 matching lines @@
 
 /**
  * Returns a human-readable representation of the type representation [type].
  */
 String runtimeTypeToString(var type) {
   if (isNull(type)) {
     return 'dynamic';
   } else if (isJsArray(type)) {
     // A list representing a type with arguments.
     return getRuntimeTypeAsString(type);
-  } else {
+  } else if (isJsFunction(type)) {
     // A reference to the constructor.
     return getConstructorName(type);
+  } else {
+    return null;
   }
 }
 
 /**
  * Creates a comma-separated string of human-readable representations of the
  * type representations in the JavaScript array [types] starting at index
  * [startIndex].
  */
 String joinArguments(var types, int startIndex) {
   if (isNull(types)) return '';
@@ skipping 557 matching lines @@
  * and [t] are Dart values.
  */
 bool isIdentical(var s, var t) => JS('bool', '# === #', s, t);
 
 /**
  * Returns [:true:] if the JavaScript values [s] and [t] are not identical. We
  * use this helper to avoid generating code under the invalid assumption that
  * [s] and [t] are Dart values.
  */
 bool isNotIdentical(var s, var t) => JS('bool', '# !== #', s, t);