I use two methods to hide my js code, atob and eval.

When my code is ready I encode it to Base64 (by online tool) and cut to many parts somewhere in code. Next I decode string and run eval(atob( codePart1 + codePart2 ))

1. Write function to tmp file

   function myHideCode() { alert("ok") }; window.myHideCode = myHideCode

2. Encode tmp file to Base64 (online tool) to variable e.g.

   var default_jpg = CAgICAgCiAgICBjb25zdCBnZXRSYW5kb21BcmJpdHJhcnkgPSAobWluLCBtYXgpID0=

3. run somewhere in code

   eval( atob(default_jpg) );

4. finally

   window.myHideCode();