OnSignatures return more specific type

src/ol/control/FullScreen.js

@@ -90,12 +90,12 @@ class FullScreen extends Control {
     });
 
     /***
-     * @type {FullScreenOnSignature<import("../Observable.js").OnReturn>}
+     * @type {FullScreenOnSignature<import("../events").EventsKey>}
      */
     this.on;
 
     /***
-     * @type {FullScreenOnSignature<import("../Observable.js").OnReturn>}
+     * @type {FullScreenOnSignature<import("../events").EventsKey>}
      */
     this.once;
 

src/ol/control/MousePosition.js

@@ -80,12 +80,12 @@ class MousePosition extends Control {
     });
 
     /***
-     * @type {MousePositionOnSignature<import("../Observable.js").OnReturn>}
+     * @type {MousePositionOnSignature<import("../events").EventsKey>}
      */
     this.on;
 
     /***
-     * @type {MousePositionOnSignature<import("../Observable.js").OnReturn>}
+     * @type {MousePositionOnSignature<import("../events").EventsKey>}
      */
     this.once;
 

src/ol/control/ScaleLine.js

@@ -100,12 +100,12 @@ class ScaleLine extends Control {
     });
 
     /***
-     * @type {ScaleLineOnSignature<import("../Observable.js").OnReturn>}
+     * @type {ScaleLineOnSignature<import("../events").EventsKey>}
      */
     this.on;
 
     /***
-     * @type {ScaleLineOnSignature<import("../Observable.js").OnReturn>}
+     * @type {ScaleLineOnSignature<import("../events").EventsKey>}
      */
     this.once;