printing to the console without newline?

Well, Serial.print doesn't print a line ending, Serial.println does. It's just print() that's there - a bit confusing, but handy for people new to JS who just want to do 'Hello World'.

To be honest it looks like a JS thing - it's not just Espruino: http://stackoverflow.com/questions/61574­97/node-js-printing-to-console-without-a­-trailing-newline

If you want to print a bit of a line at once, do console.log() which will print a newline (but will clear off the current input line and make sure it gets put back). Then use USB.print() or similar.

I guess to make it more compatible I could make process.stdout and stdin point to the current Serial device.