Use imports for enum types

src/ol/layer/Layer.js

@@ -46,7 +46,7 @@ import {listen, unlistenByKey} from '../events.js';
  * @typedef {Object} State
  * @property {import("./Layer.js").default} layer
  * @property {number} opacity Opacity, the value is rounded to two digits to appear after the decimal point.
- * @property {SourceState} sourceState
+ * @property {import("../source/State.js").default} sourceState
  * @property {boolean} visible
  * @property {boolean} managed
  * @property {import("../extent.js").Extent} [extent]

src/ol/layer/VectorTile.js

@@ -104,7 +104,7 @@ class VectorTileLayer extends BaseVectorLayer {
 
     /**
      * @private
-     * @type {VectorTileRenderType}
+     * @type {import("./VectorTileRenderType.js").default}
      */
     this.renderMode_ = renderMode;
 
@@ -144,7 +144,7 @@ class VectorTileLayer extends BaseVectorLayer {
   }
 
   /**
-   * @return {VectorTileRenderType} The render mode.
+   * @return {import("./VectorTileRenderType.js").default} The render mode.
    */
   getRenderMode() {
     return this.renderMode_;