Marshal

A library for Node.js that allows marshalling data between a master and a client (eg, a web worker thread.)

Certain libraries, such as the fs Node.js library, are not available in webworker threads.

Currently implemented

Web worker threads support

The library is currently tested and working with web worker threads.
The appropriate Node.js package is provided in package.json.

It is possible, though untested, that this library works with other threading packages.
Callbacks

Whilst true functions cannot be marshalled, callback functions can. Any function marshalled is registered as a callback and will be called with the result data.

For example, the fs.readFile function can be called from a web worker using this library, and the error and file data will be passed to the client callback function.
Buffer

Buffers, such as those returned by fs.readFile, can be marshalled.
This library also packages a Buffer class into the worker thread.