I Rot-13 the source code, you Rot-19 the output!
JavaScript (Node.js), 50 bytes

a=&gt;01+&quot;$25hYYXeya=&gt;z!`TcyV01yV~$'zv,'|&amp;&amp;z|xx-$&quot;&amp;&amp;a

Try it online!
Both versions are a function which takes a string as input and returns a string.
ROT13 code:
nJK=&gt;8/1?Buffer(nJK).map(c=&gt;(c-14)%94+33)+'':1/33n

Explanation
Hides tricky characters used in the ROT19 logic inside a string. The quotes map to / characters so it's just a matter of finding where to put them to make it work.