It is not the first time i see it
Ive seen in Facebook source ( and many other sites)
file name like these :

and Js content like this :

The JS is minimized ( whihc I know what is it)
question :
Im sure they aren’t tracking these strange names || minimized Js file.
How do they do that ?
is there source code which does it automatically ?
How can I implement these automatically names && auto minimzed ( and hashed named) JS ?
I would assume they have a build system which decides the encoded filename based on certain criteria (revision, etc…). I wouldn’t think anyone with a sane mind would do this by hand – it would make maintenance of the site pure agony.