Fixes TypeScript errors

Signed-off-by: Daniel Kastl <daniel@georepublic.de>

src/components/gtt-client/GttClient.ts

@@ -2,6 +2,7 @@ import { Map, Geolocation } from 'ol';
 import { Geometry } from 'ol/geom';
 import { Vector as VectorLayer } from 'ol/layer';
 import { Vector as VectorSource } from 'ol/source';
+import Feature from 'ol/Feature';
 
 import { IGttClientOption, IFilterOption } from './interfaces';
 
@@ -24,8 +25,8 @@ export default class GttClient {
   contents: DOMStringMap;
   i18n: any;
   filters: IFilterOption;
-  vector: VectorLayer<VectorSource<Geometry>>;
-  bounds: VectorLayer<VectorSource<Geometry>>;
+  vector: VectorLayer<VectorSource<Feature<Geometry>>>;
+  bounds: VectorLayer<VectorSource<Feature<Geometry>>>;
   geolocations: Array<Geolocation>;
 
   /**

src/components/gtt-client/init/layers.ts

@@ -50,11 +50,14 @@ export function initLayers(this: any): Layer[] {
  */
 function readGeoJSONFeatures(this: any): Feature<Geometry>[] | null {
   if (this.contents.geom && this.contents.geom !== null && this.contents.geom !== 'null') {
-    return new GeoJSON().readFeatures(
+    const features = new GeoJSON().readFeatures(
       JSON.parse(this.contents.geom), {
         featureProjection: 'EPSG:3857'
       }
     );
+
+    // Filter out non-standard features and cast the rest to Feature<Geometry>
+    return features.filter(feature => feature instanceof Feature) as Feature<Geometry>[];
   }
   return null;
 }
@@ -171,15 +174,24 @@ function addBoundsLayer(this: any): void {
  */
 function addVectorLayer(this: any, features: Feature<Geometry>[] | null): void {
   const yOrdering: unknown = Ordering.yOrdering();
-  this.vector = new VectorLayer<VectorSource<Geometry>>({
-    source: new VectorSource({
-      'features': features,
-      'useSpatialIndex': false
-    }),
+
+  // Initialize the VectorSource with the appropriate type and options
+  const vectorSource = new VectorSource<Feature<Geometry>>({
+    useSpatialIndex: false
+  });
+
+  // Add features to the source if they are not null
+  if (features !== null) {
+    vectorSource.addFeatures(features);
+  }
+
+  this.vector = new VectorLayer({
+    source: vectorSource,
     renderOrder: yOrdering as OrderFunction,
     style: getStyle.bind(this),
     minZoom: this.defaults.vectorMinzoom || 0
   });
+
   this.vector.set('title', 'Features');
   this.vector.set('displayInLayerSwitcher', false);
   this.vector.on('prerender', () => this.map.flushDeclutterItems());
@@ -223,7 +235,8 @@ function renderProjectBoundary(this: any): void {
       this.contents.bounds, {
         featureProjection: 'EPSG:3857'
       }
-    );
+    ) as Feature<Geometry>;
+
     this.bounds.getSource().addFeature(boundary);
     if (this.contents.bounds === this.contents.geom) {
       this.vector.setVisible(false);