lib/logging.js
function log_level_plus(logLevel) {
  let index = log_levels.indexOf(logLevel)
  if (index < 0) {
    return []
  } else {
    return log_levels.slice(index, log_levels.length)
  }
}
function log_level_plus(logLevel) {
  let index = log_levels.indexOf(logLevel)
  if (index < 0) {
    return []
  } else {
    return log_levels.slice(index, log_levels.length)
  }
}
function log_level_plus ( logLevel ) { let index = log_levels . indexOf ( logLevel ) if ( index < 0 ) { return [ ] } else { return log_levels . slice ( index , log_levels . length ) } }
It returns the levels above the argument
@param  {String} logLevel the log level to calculate
@return {Array}           the list of logs above the argument
It returns the levels above the argument