Plotting Data from Espruino Web IDE to Excel in order to plot a graph

I'm afraid there isn't a nice way at the moment, no... By the way, that waveform will only be 10 items long (you need new Waveform(10, {bits:16});).

If you dumped the Waveform in one long row:

var w = new Waveform(10, {bits:16});
w.on("finish", function(buf) {
  console.log(buf.join("\t"));
});
w.startInput(A0,1000,{repeat:false});

you might find it easier to copy? But then you just have to swap it around in Excel (although it looks like Excel might have a 'paste transposed' option)