diff --git a/src/ol/Geolocation.js b/src/ol/Geolocation.js
index e472b134c1..470a6362e7 100644
--- a/src/ol/Geolocation.js
+++ b/src/ol/Geolocation.js
@@ -91,6 +91,14 @@ class Geolocation extends BaseObject {
   constructor(opt_options) {
     super();
 
+    /***
+     * @type {import("./Observable").OnSignature<import("./ObjectEventType").Types|
+     *     'change:accuracy'|'change:accuracyGeometry'|'change:altitude'|'change:altitudeAccuracy'|'change:heading'|
+     *     'change:position'|'change:projection'|'change:speed'|'change:tracking'|'change:trackingOptions', import("./Object").ObjectEvent> &
+     *   import("./Observable").OnSignature<'error', GeolocationError>}
+     */
+    this.on;
+
     const options = opt_options || {};
 
     /**
diff --git a/src/ol/Overlay.js b/src/ol/Overlay.js
index f08cf2afac..50a0c3b51d 100644
--- a/src/ol/Overlay.js
+++ b/src/ol/Overlay.js
@@ -110,6 +110,13 @@ class Overlay extends BaseObject {
   constructor(options) {
     super();
 
+    /***
+     * @type {import("./Observable").OnSignature<import("./Observable").EventTypes, import("./events/Event.js").default> &
+     *   import("./Observable").OnSignature<import("./ObjectEventType").Types|
+     *     'change:element'|'change:map'|'change:offset'|'change:position'|'change:positioning', import("./Object").ObjectEvent>}
+     */
+    this.on;
+
     /**
      * @protected
      * @type {Options}
diff --git a/src/ol/View.js b/src/ol/View.js
index f6fe8412c6..5d60eb1f52 100644
--- a/src/ol/View.js
+++ b/src/ol/View.js
@@ -297,6 +297,13 @@ class View extends BaseObject {
   constructor(opt_options) {
     super();
 
+    /***
+     * @type {import("./Observable").OnSignature<import("./Observable").EventTypes, import("./events/Event.js").default> &
+     *   import("./Observable").OnSignature<import("./ObjectEventType").Types|
+     *     'change:center'|'change:resolution'|'change:rotation', import("./Object").ObjectEvent>}
+     */
+    this.on;
+
     const options = assign({}, opt_options);
 
     /**