Protected code

You can add a password or move the interactive console away, which will stop any casual reading of the code. Your code is stored as source but is fragmented all over memory so is still pretty garbled and would be hard to read out.

However if you then also turn on minification your code will be made pretty much unreadable. You could even use a javascript obfuscator. Add that to the way the code itself is fragmented around the memory space and it's very difficult to read out, and even when you do the result doesn't make much sense. I'd say it's on a par, if not more difficult to reconstruct than compiled code now.