ERROR TypeError: Cannot read property 'Point' of undefined, openlayers 3 & jsts - server-side - angularjs

Question

I am attempting to follow this example in order to buffer some features drawn on the map.
However, that gives me the following error:
ERROR TypeError: Cannot read property 'Point' of undefined
Here is my code:
BufferFeature(feature){
var parser = new jsts.io.OL3Parser();
let format = new ol.format.WKT();
// convert the OpenLayers geometry to a JSTS geometry
var jstsGeom = parser.read(format.writeGeometry(feature.getGeometry()));
// create a buffer of 40 meters around each line
var buffered = jstsGeom.buffer(40);
// convert back from JSTS and replace the geometry on the feature
feature.setGeometry(parser.write(buffered));
let source = this.VectorOverlay.getSource();
source.addFeatures(feature);
}
Can someone identify where I am going wrong?

Answer 1

I finally solve this problem using the inject method of OL3Parse. your code should look like:
var Geojson = require('ol/format/geojson');
var Vector = require('ol/source/vector');
var Feature = require('ol/feature');
var LineString = require('ol/geom/linestring');
var Point = require('ol/geom/point');
var jsts = require('jsts');
var ol3Parser = new jsts.io.OL3Parser();
ol3Parser.inject(Point, LineString);
BufferFeature(feature){
let format = new ol.format.WKT();
// convert the OpenLayers geometry to a JSTS geometry
var jstsGeom = ol3Parser.read(format.writeGeometry(feature.getGeometry()));
// create a buffer of 40 meters around each line
var buffered = jstsGeom.buffer(40);
// convert back from JSTS and replace the geometry on the feature
feature.setGeometry(parser.write(buffered));
let source = this.VectorOverlay.getSource();
source.addFeatures(feature);
}
This works for:
function inject(Point, LineString, LinearRing, Polygon, MultiPoint, MultiLineString, MultiPolygon, GeometryCollection) {};