$ npm install here-map-wrapper --save 
  or 
  $ yarn add here-map-wrapperconst config = {
  appId: 'your appId',
  appCode: 'your appCode'
}
const hereMap = new HereMapWrapper(config)
const locations = [
  {lat: 51.10177, lng: 0.39349},
  {lat: 51.10181, lng: 0.39335},
  {lat: 51.10255, lng: 0.39369}
]
hereMap.getPolyline(locations).then(function(polyline) {
  console.log(polyline)
  // polyline = 'ox{vHq|kA_@nB??{@_@??SI??OG??YMSK??[Q' 
})