Hi, thanks for the cool library!
Recently faced an unobvious problem

Current Behavior

When adding a library using gulp.js (concatenate many scripts into one file), I get the error Cannot set property 'lozad' of undefined, the error was in this line of code (global.lozad = factory()); global was undefined
although when loading via cdn - there are no errors

Possible Solution

I added a simple check (global = global || self, global.lozad = factory()); and everything worked as expected

Please pay attention

P.S. You've got a cool tool