When no options are passed, it assumes we are in browser context

[daviddias]

/Users/david/Documents/code/ipfs/node-ipfs-api/src/index.js:25
    window && window.location) {
    ^

ReferenceError: window is not defined

with:

var ipfsAPI = require('./src')()

running on Node.js

[victorb]

Closed by #63