How can I get sharejs running with nodejs?

I'm having trouble with nodejs and sharejs. I am trying to use sharejs and have installed via npm. I can't seem to get it to load however. In my code all I have is the following:

var client = require('share').client;

when i call node myfile.js

I get the following error.

the variable "exports" can't be assigned with ?= because it has not been defined

I am a bit of a nodejs beginner and appreciate any help or pointers.

Thank you