window object in server version

I tried to import the server version of right (http://rightjs.org/builds/current/right-server.js) in node with:

require('./right');

Executing the file, I get the following error:

/home/Gdipietro/right/right.js:221
  $ext(RightJS[natives[i]] = window[natives[i]], {
                      ^
ReferenceError: window is not defined
    at Object.<anonymous> (/home/Gdipietro/right/right.js:221:23)
    at Module._compile (module:426:23)
    at Module._loadScriptSync (module:436:8)
    at Module.loadSync (module:306:10)
    at loadModule (module:251:12)
    at require (module:374:12)
    at Object.<anonymous> (/home/Gdipietro/right/index.js:5:1)
    at Module._compile (module:426:23)
    at Module._loadScriptSync (module:436:8)
    at Module.loadSync (module:306:10)

Is it normal that server side version tries to access the window object? Thanks