API changes between v0.4 and v0.6

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Changed:

• The customFds option to the child_process.spawn method is deprecated. Only the values -1, 0, 1, 2 will work with customFds now and only if those are TTY file descriptors. You can however use the stdinStream, stdoutStream, and stderrStream options to achieve similar functionality.
• You can no longer send a file descriptor through a unix pipe. Instead you can send a handle via child_process.fork.
• The 'unix_dgram' type to the dgram.createSocket() is no longer supported.
• fs.symlink takes an optional mode argument, which can either be 'dir' or 'file'. The default is 'file'. This argument is only needed for Windows (it's ignored on other platforms).
• http.Agent.appendMessage was removed.
• https.request() and https.get() with default Agent cannot accept key, cert and ca options. Use custom Agent.
• net.Server.listenFD() is no longer supported.
• The require.paths have been removed (use NODE_PATH environment variable instead).
• C++ node::EventEmitter has been removed. Instead use node::MakeCallback()
• EventEmitter.removeAllListeners() allows to remove all listeners at once.
• process.ENV was removed. Use process.env instead.
• process.ARGV was removed. Use process.argv instead.
• process.binding('stdio') was removed. This was a private API. You shouldn't have been using it in the first place.

Added:

• assert(val) as a shorthand for assert.ok(val)
• Buffer supports 'hex' encoding.
• Buffer.readInt8()/readInt16BE()/readInt16LE()/readInt32LE()/readInt32BE()
• Buffer.readUInt8()/readUInt16BE()/readUInt16LE()/rreadUInt32LE()/readUInt32BE()
• Buffer.readFloatBE()/readFloadLE()/readDoubleBE()/readDoubleLE()
• Buffer.writeInt8()/writeInt16BE()/writeInt16LE()/write32BE()/write32LE()
• Buffer.writeUInt8()/writeUInt16BE()/writeUInt16LE()/writeU32BE()/writeU32LE()
• Buffer.writeFloatBE()/writeFloatLE()/writeDoubleBE()/writeDoubleLE()
• Typed Arrays
• Buffer.fill()
• child_process.fork()
• crypto.createDiffieHellman(), crypto.pbkdf2(), crypto.randomBytes()
• fs.utimes()/utimesSync(), fs.futimes()/futimesSync()
• fs.watch
• Module system supports .json module.
• net.connect()
• net.Socket.remotePort, bytesRead, bytesWrite
• os.arch(), os.uptime(), os.getNetworkInterfaces()
• path.relative()
• process.arch, process.uptime()
• tls.Server supports NPN (Next Protocol Negotitation) and SNI (Server Name Indication).
• util.format()
• zlib module http://nodejs.org/docs/v0.5.9/api/zlib.html