Wouldn't it be a lot easier and more secure if you simply looked up the code in these packages you're using, reviewed the code to make sure it's legitimate, then copied it to say, your own utils.js package? I'm not even talking about the left-pad package, which shouldn't even be part of the discussion... If you're worried about including 2-4 lines of code on your own then you shouldn't be making an application other people will use in the first place.

Apparently it's not obvious that having a ton of dependencies on 3rd party packages, of which can change at any time on the whim of the owner, is pretty insane in terms of security and minimizing complexity of your application.

You do realize that even though you reviewed the 20 different packages you use at one time, they can change at any time?

I would love to hear what a senior dev at any reputable, long established technology company thinks about including tens, if not hundreds (and some apps, thousands?) of 3rd party packages from strangers on the internet with no validity checks in place. Sign me up!