code: function rhumbBearing(start, end, options = {}) {
      let bear360;
      if (options.final) bear360 = calculateRhumbBearing(end, start);
      else bear360 = calculateRhumbBearing(start, end);
  
      const bear180 = (bear360 > 180) ? -(360 - bear360) : bear360;
  
      return bear180;
  }
docs: from turf.js