Add optional types to function/method declarations

src/parsing/preparser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_PREPARSER_H
 #define V8_PARSING_PREPARSER_H
 
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
 #include "src/hashmap.h"
@@ skipping 1182 matching lines @@
 
   void CheckConflictingVarDeclarations(Scope* scope, bool* ok) {}
 
   // Temporary glue; these functions will move to ParserBase.
   PreParserExpression ParseV8Intrinsic(bool* ok);
   V8_INLINE PreParserExpression ParseDoExpression(bool* ok);
   PreParserExpression ParseFunctionLiteral(
       PreParserIdentifier name, Scanner::Location function_name_location,
       FunctionNameValidity function_name_validity, FunctionKind kind,
       int function_token_position, FunctionLiteral::FunctionType type,
-      LanguageMode language_mode, bool* ok);
+      LanguageMode language_mode, typesystem::TypeFlags type_flags, bool* ok);
 
   PreParserExpression ParseClassLiteral(PreParserIdentifier name,
                                         Scanner::Location class_name_location,
                                         bool name_is_strict_reserved, int pos,
                                         bool* ok);
 
   PreParserExpressionList PrepareSpreadArguments(PreParserExpressionList list) {
     return list;
   }
 
@@ skipping 157 matching lines @@
   Expression ParseV8Intrinsic(bool* ok);
   Expression ParseDoExpression(bool* ok);
 
   V8_INLINE void SkipLazyFunctionBody(int* materialized_literal_count,
                                       int* expected_property_count, bool* ok);
   V8_INLINE PreParserStatementList ParseEagerFunctionBody(
       PreParserIdentifier function_name, int pos,
       const PreParserFormalParameters& parameters, FunctionKind kind,
       FunctionLiteral::FunctionType function_type, bool* ok);
 
-  Expression ParseFunctionLiteral(
-      Identifier name, Scanner::Location function_name_location,
-      FunctionNameValidity function_name_validity, FunctionKind kind,
-      int function_token_pos, FunctionLiteral::FunctionType function_type,
-      LanguageMode language_mode, bool* ok);
+  Expression ParseFunctionLiteral(Identifier name,
+                                  Scanner::Location function_name_location,
+                                  FunctionNameValidity function_name_validity,
+                                  FunctionKind kind, int function_token_pos,
+                                  FunctionLiteral::FunctionType function_type,
+                                  LanguageMode language_mode,
+                                  typesystem::TypeFlags type_flags, bool* ok);
   void ParseLazyFunctionLiteralBody(bool* ok,
                                     Scanner::BookmarkScope* bookmark = nullptr);
 
   PreParserExpression ParseClassLiteral(PreParserIdentifier name,
                                         Scanner::Location class_name_location,
                                         bool name_is_strict_reserved, int pos,
                                         bool* ok);
 };
 
 
@@ skipping 83 matching lines @@
     const PreParserFormalParameters& parameters, FunctionKind kind,
     FunctionLiteral::FunctionType function_type, bool* ok) {
   return pre_parser_->ParseEagerFunctionBody(function_name, pos, parameters,
                                              kind, function_type, ok);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H