Add ': void' to non returning functions (error TS7014)

src/ol/pointer/EventSource.js

@@ -6,7 +6,7 @@ class EventSource {
 
   /**
    * @param {import("./PointerEventHandler.js").default} dispatcher Event handler.
-   * @param {!Object<string, function(Event)>} mapping Event mapping.
+   * @param {!Object<string, function(Event): void>} mapping Event mapping.
    */
   constructor(dispatcher, mapping) {
 
@@ -18,7 +18,7 @@ class EventSource {
     /**
      * @private
      * @const
-     * @type {!Object<string, function(Event)>}
+     * @type {!Object<string, function(Event): void>}
      */
     this.mapping_ = mapping;
   }

src/ol/pointer/PointerEventHandler.js

@@ -105,7 +105,7 @@ class PointerEventHandler extends EventTarget {
     this.pointerMap = {};
 
     /**
-     * @type {Object<string, function(Event)>}
+     * @type {Object<string, function(Event): void>}
      * @private
      */
     this.eventMap_ = {};

src/ol/pointer/TouchSource.js

@@ -247,7 +247,7 @@ class TouchSource extends EventSource {
   /**
    * @private
    * @param {TouchEvent} inEvent Touch event
-   * @param {function(TouchEvent, PointerEvent)} inFunction In function.
+   * @param {function(TouchEvent, PointerEvent): void} inFunction In function.
    */
   processTouches_(inEvent, inFunction) {
     const touches = Array.prototype.slice.call(inEvent.changedTouches);