How to use the geolib.convertUnit function in geolib

children: props => {
    const system = props.imperial ? 'mi' : 'km'
    return `${geolib.convertUnit(system, props.distance, 1)} ${system} away`
  },
  color: 'white',

function getDistance(fromLocation, toLocation) {
  const distance = geolib.getDistance(fromLocation, toLocation);
  return geolib.convertUnit('mi', distance, 1);
}