directions-example

// from and to are objects that live somewhere else (for examples sake)

uiGmapGoogleMapApi.then(function(maps){
  var directionsService = new maps.DirectionsService();
  
  var request = {
		origin: new maps.LatLng(
			from.lat(), 
			from.lng()
		),
		destination: new maps.LatLng(
			to.lat(), 
			to.lng()
		),
		travelMode: maps.TravelMode['DRIVING'],
		optimizeWaypoints: true
	};
  
  directionsService.route(request, function(response, status) {
  //do stuff here with response
  });
});

What is the ui code that you have written for this?

Says that from is not defined.

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