Support runtime check of function types.

sdk/lib/_internal/lib/foreign_helper.dart

 // Copyright (c) 2012, 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.
 
 library _foreign_helper;
 
 /**
  * Emits a JavaScript code fragment parameterized by arguments.
  *
  * Hash characters `#` in the [codeTemplate] are replaced in left-to-right order
@@ skipping 143 matching lines @@
 String JS_OPERATOR_IS_PREFIX() {}
 
 /**
  * Returns the prefix used for generated type argument substitutions on classes.
  */
 String JS_OPERATOR_AS_PREFIX() {}
 
 /// Returns the name of the class `Object` in the generated code.
 String JS_OBJECT_CLASS_NAME() {}
 
+/// Returns the name of the class `Function` in the generated code.
+String JS_FUNCTION_CLASS_NAME() {}
+
 /**
  * Returns the field name used for determining if an object or its
  * interceptor has JavaScript indexing behavior.
  */
 String JS_IS_INDEXABLE_FIELD_NAME() {}
 
 /**
  * Returns the object corresponding to Namer.CURRENT_ISOLATE.
  */
 JS_CURRENT_ISOLATE() {}
+
+/// Returns the name used for generated function types on classes and methods.
+String JS_SIGNATURE_NAME() {}
+
+/// Returns the name used to tag function type representations in JavaScript.
+String JS_FUNCTION_TYPE_TAG() {}
+
+/**
+ * Returns the name used to tag void return in function type representations
+ * in JavaScript.
+ */
+String JS_FUNCTION_TYPE_VOID_RETURN_TAG() {}
+
+/**
+ * Returns the name used to tag return types in function type representations
+ * in JavaScript.
+ */
+String JS_FUNCTION_TYPE_RETURN_TYPE_TAG() {}
+
+/**
+ * Returns the name used to tag required parameters in function type
+ * representations in JavaScript.
+ */
+String JS_FUNCTION_TYPE_REQUIRED_PARAMETERS_TAG() {}
+
+/**
+ * Returns the name used to tag optional parameters in function type
+ * representations in JavaScript.
+ */
+String JS_FUNCTION_TYPE_OPTIONAL_PARAMETERS_TAG() {}
+
+/**
+ * Returns the name used to tag named parameters in function type
+ * representations in JavaScript.
+ */
+String JS_FUNCTION_TYPE_NAMED_PARAMETERS_TAG() {}
+
+/**
+ * Returns the global object, usually called encoded as [: $ :].
+ */
+JS_GLOBAL_OBJECT() {}