OnSignatures return more specific type

src/ol/layer/Base.js

@@ -60,12 +60,12 @@ class BaseLayer extends BaseObject {
     super();
 
     /***
-     * @type {BaseLayerOnSignature<import("../Observable.js").OnReturn>}
+     * @type {BaseLayerOnSignature<import("../events").EventsKey>}
      */
     this.on;
 
     /***
-     * @type {BaseLayerOnSignature<import("../Observable.js").OnReturn>}
+     * @type {BaseLayerOnSignature<import("../events").EventsKey>}
      */
     this.once;
 

src/ol/layer/BaseTile.js

@@ -72,12 +72,12 @@ class BaseTileLayer extends Layer {
     super(baseOptions);
 
     /***
-     * @type {BaseTileLayerOnSignature<import("../Observable.js").OnReturn>}
+     * @type {BaseTileLayerOnSignature<import("../events").EventsKey>}
      */
     this.on;
 
     /***
-     * @type {BaseTileLayerOnSignature<import("../Observable.js").OnReturn>}
+     * @type {BaseTileLayerOnSignature<import("../events").EventsKey>}
      */
     this.once;
 

src/ol/layer/Group.js

@@ -73,12 +73,12 @@ class LayerGroup extends BaseLayer {
     super(baseOptions);
 
     /***
-     * @type {GroupOnSignature<import("../Observable.js").OnReturn>}
+     * @type {GroupOnSignature<import("../events").EventsKey>}
      */
     this.on;
 
     /***
-     * @type {GroupOnSignature<import("../Observable.js").OnReturn>}
+     * @type {GroupOnSignature<import("../events").EventsKey>}
      */
     this.once;
 

src/ol/layer/Layer.js

@@ -107,12 +107,12 @@ class Layer extends BaseLayer {
     super(baseOptions);
 
     /***
-     * @type {LayerOnSignature<import("../Observable.js").OnReturn>}
+     * @type {LayerOnSignature<import("../events").EventsKey>}
      */
     this.on;
 
     /***
-     * @type {LayerOnSignature<import("../Observable.js").OnReturn>}
+     * @type {LayerOnSignature<import("../events").EventsKey>}
      */
     this.once;
 

src/ol/layer/VectorTile.js

@@ -106,12 +106,12 @@ class VectorTileLayer extends BaseVectorLayer {
     );
 
     /***
-     * @type {VectorTileLayerOnSignature<import("../Observable.js").OnReturn>}
+     * @type {VectorTileLayerOnSignature<import("../events").EventsKey>}
      */
     this.on;
 
     /***
-     * @type {VectorTileLayerOnSignature<import("../Observable.js").OnReturn>}
+     * @type {VectorTileLayerOnSignature<import("../events").EventsKey>}
      */
     this.once;