Use union instead of enum for geometry type

src/ol/render/Feature.js

@@ -3,7 +3,6 @@
  */
 import Feature from '../Feature.js';
 import GeometryLayout from '../geom/GeometryLayout.js';
-import GeometryType from '../geom/GeometryType.js';
 import {
   LineString,
   MultiLineString,
@@ -45,7 +44,7 @@ const tmpTransform = createTransform();
  */
 class RenderFeature {
   /**
-   * @param {import("../geom/GeometryType.js").default} type Geometry type.
+   * @param {import("../geom/Geometry.js").Type} type Geometry type.
    * @param {Array<number>} flatCoordinates Flat coordinates. These always need
    *     to be right-handed for polygons.
    * @param {Array<number>|Array<Array<number>>} ends Ends or Endss.
@@ -72,7 +71,7 @@ class RenderFeature {
 
     /**
      * @private
-     * @type {import("../geom/GeometryType.js").default}
+     * @type {import("../geom/Geometry.js").Type}
      */
     this.type_ = type;
 
@@ -125,7 +124,7 @@ class RenderFeature {
   getExtent() {
     if (!this.extent_) {
       this.extent_ =
-        this.type_ === GeometryType.POINT
+        this.type_ === 'Point'
           ? createOrUpdateFromCoordinate(this.flatCoordinates_)
           : createOrUpdateFromFlatCoordinates(
               this.flatCoordinates_,
@@ -283,7 +282,7 @@ class RenderFeature {
 
   /**
    * Get the type of this feature's geometry.
-   * @return {import("../geom/GeometryType.js").default} Geometry type.
+   * @return {import("../geom/Geometry.js").Type} Geometry type.
    * @api
    */
   getType() {