Use addLevel() to define your own custom levels.

You can add your own custom levels now.

The level name and priority are mandatory arguments, and
lgr will throw an error if either is missing. You can
define your own style and prefix, npm style.

// mandatory arguments
log.addLevel('wall', 3500);

// optional arguments
log.addLevel('hell', 6666, {fg: 'black', bg: 'red'}, 'HELL!');