Index: src/FileSystemJsObject.cpp
===================================================================
--- a/src/FileSystemJsObject.cpp
+++ b/src/FileSystemJsObject.cpp
@@ -56,18 +56,18 @@
     }
 
     void Run()
     {
       std::string content;
       std::string error;
       try
       {
-        std::shared_ptr<std::istream> stream = fileSystem->Read(path);
-        content = Utils::Slurp(*stream);
+        auto buffer = fileSystem->Read(path);
+        content = std::string(buffer.cbegin(), buffer.cend());
       }
       catch (std::exception& e)
       {
         error = e.what();
       }
       catch (...)
       {
         error =  "Unknown error while reading from " + path;
@@ -95,19 +95,18 @@
     {
     }
 
     void Run()
     {
       std::string error;
       try
       {
-        std::stringstream stream;
-        stream << content;
-        fileSystem->Write(path, stream);
+        FileSystem::IOBuffer buffer(content.cbegin(), content.cend());
+        fileSystem->Write(path, buffer);
       }
       catch (std::exception& e)
       {
         error = e.what();
       }
       catch (...)
       {
         error = "Unknown error while writing to " + path;