ReferenceError: window is not defined

[kieranshanley]

When running the example code I get
/home//node_modules/dialogs/index.js:18
'.url': opt.hostname || window.location.hostname
^

ReferenceError: window is not defined

If I run the same code in RunKit it suggests:
Use global instead of window.
RunKit is a node environment, so window and other browser features won’t exist. If you’re just trying to access the global object, you can simply use global instead.