If I

1. create a script like the one below
2. name it myscript (without any extension)
3. run the script and then abort the script using i.e. ctrl-c

then a copy of the script, with a mjs extension, is written to the same directory as the script. This also happens if the script is aborted with process.exit().

A new copy is created on each repetition, with some random characters added to the name.

#!/usr/bin/env zx

while(true) {
  console.log('Running a process that should repeat forever ...')
  await $`sleep 1`
}

I belive this has something to do with functionality for running scripts downloaded directly from a URL, but I'm not sure.

A workaround is to capture the SIGINT interrupt (like below) and always ensure that the script exits in a normal way, but this can be quite clumsy and may possibly not work if you spawn a long-running process that you want to abort.

#!/usr/bin/env zx

let exit = false

process.on('SIGINT', function() {
  exit = true
});

while(true && !exit) {
  console.log('Running a process that should repeat forever ...')
  await $`sleep 1`
}