HH\Lib\IO\SeekableReadWriteHandle
Requires the Hack Standard Library - Experimental Additions to be installed.
Facebook Engineer?
This function is available as IO\SeekableReadWriteHandle() in Facebook's www repository.
An interface for seekable read and write handles
Interface Synopsis
namespace HH\Lib\IO;
interface SeekableReadWriteHandle implements SeekableWriteHandle, SeekableReadHandle {...}