ServerJS/Filesystem API

Prior Art

Microsoft Scripting.FileSystemObject. Used in classic ASP, WSH, HTAs.
JavaScript File object proposal http://www.mozilla.org/js/js-file-object.html (~1998)
Spidermonkey File object
Synchronet provides a File Class that was originally inspired by SpiderMonkey's jsfile.c, but has been widely used and enhanced over the years: http://synchro.net/docs/jsobjs.html#File
This File class from Ejscript is still evolving but is fairly comprehensive. It supports stackable streams such as BinaryStream, StringStream. It can also do I/O to and from a ByteArray class.
JSExt.File http://jsext.sourceforge.net/JSEXT1.File.html
jslibs jsio module http://code.google.com/p/jslibs/wiki/jsio
wxJavascript IO module http://www.wxjavascript.net/io/index.html
v8cgi has a File and Directory interfaces
helma has two File apis. One deprecated and one current
adobe's extendscript has a File constructor.Documentation is difficult to find online.
generic collection/document resource (java) api (work in process)