Add parsing for type aliases

src/parsing/parser.cc

 // 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.
 
 #include "src/parsing/parser.h"
 
 #include "src/api.h"
 #include "src/ast/ast.h"
 #include "src/ast/ast-expression-rewriter.h"
 #include "src/ast/ast-expression-visitor.h"
@@ skipping 1271 matching lines @@
         return ParseVariableStatement(kStatementListItem, NULL, ok);
       }
       break;
     case Token::VAR:
       return ParseVariableStatement(kStatementListItem, NULL, ok);
     case Token::LET:
       if (IsNextLetKeyword()) {
         return ParseVariableStatement(kStatementListItem, NULL, ok);
       }
       break;
+    case Token::IDENTIFIER: {
+      if (!scope_->typed()) break;
+      int pos = peek_position();
+      if (PeekContextualKeyword(CStrVector("type")) &&
+          PeekAhead() == Token::IDENTIFIER) {
+        Consume(Token::IDENTIFIER);
+        return ParseTypeAliasDeclaration(pos, ok);
+      }
+      break;
+    }
+    // TODO(nikolaos): interface
+    // TODO(nikolaos): ambient
     default:
       break;
   }
   return ParseStatement(NULL, ok);
 }
 
 
 Statement* Parser::ParseModuleItem(bool* ok) {
   // (Ecma 262 6th Edition, 15.2):
   // ModuleItem :
@@ skipping 5678 matching lines @@
                         try_block, target);
     final_loop = target;
   }
 
   return final_loop;
 }
 
 
 }  // namespace internal
 }  // namespace v8