You can colorize things your sent to ray by using the color function.
ray('this is green').color('green')
ray('this is orange').color('orange')
ray('this is red').color('red')
ray('this is blue').color('blue')
ray('this is purple').color('purple')
ray('this is gray').color('gray')
Note: The JS ray client does not support getting the caller of a function, pausing execution, performance and memory measurements, or halting the JS process. There's also no current support for showing the origin of the js request, althrough we hope to add that in soon.