TurfJS Calculate bearing on a certain point on a line (with a buffer)

bearingOnLine.js

// import turf

function bearingOnLine(feature, distance, buffer, units){
    var lineDistance = turf.lineDistance(feature, units);
    buffer = buffer || lineDistance * 0.07;
    var measureFromDistance = Math.max(0, distance - buffer);
    var measureToDistance = Math.min(lineDistance, distance + buffer);

    var measureFrom = turf.along(feature, measureFromDistance, units);
    var measureTo = turf.along(feature, measureToDistance, units);
    var bearing = turf.bearing(measureFrom, measureTo);
    return bearing;
}