ReferenceError: window is not defined

[echan00]

Trying to run this demo without much luck. Seems like the obelisk.js library is having trouble with 'window'

/Users/xxx/Downloads/test5/node_modules/obelisk.js/src/obelisk.js:53
window.obelisk = obelisk;
^

ReferenceError: window is not defined
    at Object.<anonymous> (/Users/xxx/Downloads/test5/node_modules/obelisk.js/src/obelisk.js:53:1)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (/Users/erikchan/Downloads/test5/index.js:5:15)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)

{
  "name": "node-obelisk-canvas-example",
  "version": "0.0.1",
  "description": "Example of how to run obelisk.js in Node.js",
  "dependencies": {
    "canvas": "^2.6.1",
    "iterm2-image": "^0.0.2",
    "lego-colors": "^0.0.2",
    "obelisk.js": "^1.2.2"
  }
}