HH\Lib\IO\WriteHandle
Requires the Hack Standard Library - Experimental Additions to be installed.
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This function is available as IO\WriteHandle() in Facebook's www repository.
An interface for a writable Handle
Order of operations is guaranteed, except for rawWriteBlocking;
rawWriteBlocking() will immediately try to write to the handle.
Interface Synopsis
namespace HH\Lib\IO;
interface WriteHandle implements Handle {...}