diff --git a/src/ol/Image.js b/src/ol/Image.js
index 4bca08ee31..fdfec05be1 100644
--- a/src/ol/Image.js
+++ b/src/ol/Image.js
@@ -22,7 +22,7 @@ import {getHeight} from './extent.js';
  * post requests or - in general - through XHR requests, where the src of the
  * image element would be set to a data URI when the content is loaded.
  *
- * @typedef {function(ImageWrapper, string)} LoadFunction
+ * @typedef {function(ImageWrapper, string): void} LoadFunction
  * @api
  */
 
diff --git a/src/ol/ImageCanvas.js b/src/ol/ImageCanvas.js
index bd26136d5b..5207014528 100644
--- a/src/ol/ImageCanvas.js
+++ b/src/ol/ImageCanvas.js
@@ -11,7 +11,7 @@ import ImageState from './ImageState.js';
  * If any error occurs during drawing, the "done" callback should be called with
  * that error.
  *
- * @typedef {function(function(Error=))} Loader
+ * @typedef {function(function(Error=): void): void} Loader
  */
 
 
diff --git a/src/ol/PluggableMap.js b/src/ol/PluggableMap.js
index f65c1ca150..1a702641aa 100644
--- a/src/ol/PluggableMap.js
+++ b/src/ol/PluggableMap.js
@@ -336,7 +336,7 @@ class PluggableMap extends BaseObject {
     this.renderer_ = this.createRenderer();
 
     /**
-     * @type {function(Event)|undefined}
+     * @type {function(Event): void|undefined}
      * @private
      */
     this.handleResize_;
diff --git a/src/ol/Tile.js b/src/ol/Tile.js
index f7a9dc0e78..aba97d71fb 100644
--- a/src/ol/Tile.js
+++ b/src/ol/Tile.js
@@ -40,7 +40,7 @@ import EventType from './events/EventType.js';
  * });
  * ```
  *
- * @typedef {function(Tile, string)} LoadFunction
+ * @typedef {function(Tile, string): void} LoadFunction
  * @api
  */
 
diff --git a/src/ol/VectorImageTile.js b/src/ol/VectorImageTile.js
index ce1459f3bc..1e16db4599 100644
--- a/src/ol/VectorImageTile.js
+++ b/src/ol/VectorImageTile.js
@@ -38,7 +38,7 @@ class VectorImageTile extends Tile {
    * @param {import("./proj/Projection.js").default} projection Projection.
    * @param {typeof import("./VectorTile.js").default} tileClass Class to
    *     instantiate for source tiles.
-   * @param {function(this: import("./source/VectorTile.js").default, import("./events/Event.js").default)} handleTileChange
+   * @param {function(this: import("./source/VectorTile.js").default, import("./events/Event.js").default): void} handleTileChange
    *     Function to call when a source tile's state changes.
    * @param {number} zoom Integer zoom to render the tile for.
    */
diff --git a/src/ol/View.js b/src/ol/View.js
index 303934ac94..bf23973caa 100644
--- a/src/ol/View.js
+++ b/src/ol/View.js
@@ -399,7 +399,7 @@ class View extends BaseObject {
    * calling `view.setCenter()`, `view.setResolution()`, or `view.setRotation()`
    * (or another method that calls one of these).
    *
-   * @param {...(AnimationOptions|function(boolean))} var_args Animation
+   * @param {...(AnimationOptions|function(boolean): void)} var_args Animation
    *     options.  Multiple animations can be run in series by passing multiple
    *     options objects.  To run multiple animations in parallel, call the method
    *     multiple times.  An optional callback can be provided as a final
diff --git a/src/ol/control/Control.js b/src/ol/control/Control.js
index 5f838bf602..bcfd7f6ebd 100644
--- a/src/ol/control/Control.js
+++ b/src/ol/control/Control.js
@@ -79,7 +79,7 @@ class Control extends BaseObject {
     this.listenerKeys = [];
 
     /**
-     * @type {function(import("../MapEvent.js").default)}
+     * @type {function(import("../MapEvent.js").default): void}
      */
     this.render = options.render ? options.render : VOID;
 
diff --git a/src/ol/featureloader.js b/src/ol/featureloader.js
index dce9c2acba..6300aa6b42 100644
--- a/src/ol/featureloader.js
+++ b/src/ol/featureloader.js
@@ -17,7 +17,7 @@ import FormatType from './format/FormatType.js';
  * The function is responsible for loading the features and adding them to the
  * source.
  * @typedef {function(this:(import("./source/Vector").default|import("./VectorTile.js").default), import("./extent.js").Extent, number,
- *                    import("./proj/Projection.js").default)} FeatureLoader
+ *                    import("./proj/Projection.js").default): void} FeatureLoader
  * @api
  */
 
@@ -38,10 +38,10 @@ import FormatType from './format/FormatType.js';
 /**
  * @param {string|FeatureUrlFunction} url Feature URL service.
  * @param {import("./format/Feature.js").default} format Feature format.
- * @param {function(this:import("./VectorTile.js").default, Array<import("./Feature.js").default>, import("./proj/Projection.js").default, import("./extent.js").Extent)|function(this:import("./source/Vector").default, Array<import("./Feature.js").default>)} success
+ * @param {function(this:import("./VectorTile.js").default, Array<import("./Feature.js").default>, import("./proj/Projection.js").default, import("./extent.js").Extent): void|function(this:import("./source/Vector").default, Array<import("./Feature.js").default>): void} success
  *     Function called with the loaded features and optionally with the data
  *     projection. Called with the vector tile or source as `this`.
- * @param {function(this:import("./VectorTile.js").default)|function(this:import("./source/Vector").default)} failure
+ * @param {function(this:import("./VectorTile.js").default): void|function(this:import("./source/Vector").default): void} failure
  *     Function called when loading failed. Called with the vector tile or
  *     source as `this`.
  * @return {FeatureLoader} The feature loader.
diff --git a/src/ol/format/GPX.js b/src/ol/format/GPX.js
index 98018c5267..5d3ba4988e 100644
--- a/src/ol/format/GPX.js
+++ b/src/ol/format/GPX.js
@@ -132,7 +132,7 @@ class GPX extends XMLFeature {
     this.dataProjection = getProjection('EPSG:4326');
 
     /**
-     * @type {function(Feature, Node)|undefined}
+     * @type {function(Feature, Node): void|undefined}
      * @private
      */
     this.readExtensions_ = options.readExtensions;
diff --git a/src/ol/interaction/DragBox.js b/src/ol/interaction/DragBox.js
index e08cb7f1a2..0791493634 100644
--- a/src/ol/interaction/DragBox.js
+++ b/src/ol/interaction/DragBox.js
@@ -133,7 +133,7 @@ class DragBox extends PointerInteraction {
 
     /**
      * Function to execute just before `onboxend` is fired
-     * @type {function(this:DragBox, import("../MapBrowserEvent.js").default)}
+     * @type {function(this:DragBox, import("../MapBrowserEvent.js").default): void}
      * @private
      */
     this.onBoxEnd_ = options.onBoxEnd ? options.onBoxEnd : VOID;
diff --git a/src/ol/interaction/Modify.js b/src/ol/interaction/Modify.js
index dc6d73d5c4..d907124c9f 100644
--- a/src/ol/interaction/Modify.js
+++ b/src/ol/interaction/Modify.js
@@ -274,7 +274,7 @@ class Modify extends PointerInteraction {
     /**
      * @const
      * @private
-     * @type {!Object<string, function(Feature, import("../geom/Geometry.js").default)>}
+     * @type {!Object<string, function(Feature, import("../geom/Geometry.js").default): void>}
      */
     this.SEGMENT_WRITERS_ = {
       'Point': this.writePointGeometry_,
diff --git a/src/ol/interaction/Snap.js b/src/ol/interaction/Snap.js
index 59c06bace1..c40ee6b8de 100644
--- a/src/ol/interaction/Snap.js
+++ b/src/ol/interaction/Snap.js
@@ -181,7 +181,7 @@ class Snap extends PointerInteraction {
     /**
     * @const
     * @private
-    * @type {Object<string, function(import("../Feature.js").default, import("../geom/Geometry.js").default)>}
+    * @type {Object<string, function(import("../Feature.js").default, import("../geom/Geometry.js").default): void>}
     */
     this.SEGMENT_WRITERS_ = {
       'Point': this.writePointGeometry_,
diff --git a/src/ol/pointer/EventSource.js b/src/ol/pointer/EventSource.js
index 1a0c9da0ca..d53ccc7f0d 100644
--- a/src/ol/pointer/EventSource.js
+++ b/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;
   }
diff --git a/src/ol/pointer/PointerEventHandler.js b/src/ol/pointer/PointerEventHandler.js
index 6f3014905c..2501efa12b 100644
--- a/src/ol/pointer/PointerEventHandler.js
+++ b/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_ = {};
diff --git a/src/ol/pointer/TouchSource.js b/src/ol/pointer/TouchSource.js
index 0e9ea52ff9..54fac3a1fa 100644
--- a/src/ol/pointer/TouchSource.js
+++ b/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);
diff --git a/src/ol/render/canvas/Builder.js b/src/ol/render/canvas/Builder.js
index 3c111ced3a..9b1b507066 100644
--- a/src/ol/render/canvas/Builder.js
+++ b/src/ol/render/canvas/Builder.js
@@ -397,7 +397,7 @@ class CanvasBuilder extends VectorContext {
 
   /**
    * @param {import("../canvas.js").FillStrokeState} state State.
-   * @param {function(this:CanvasBuilder, import("../canvas.js").FillStrokeState)} applyStroke Apply stroke.
+   * @param {function(this:CanvasBuilder, import("../canvas.js").FillStrokeState): void} applyStroke Apply stroke.
    */
   updateStrokeStyle(state, applyStroke) {
     const strokeStyle = state.strokeStyle;
diff --git a/src/ol/renderer/vector.js b/src/ol/renderer/vector.js
index ab5eca69aa..236df3efca 100644
--- a/src/ol/renderer/vector.js
+++ b/src/ol/renderer/vector.js
@@ -18,7 +18,7 @@ const SIMPLIFY_TOLERANCE = 0.5;
  * @const
  * @type {Object<import("../geom/GeometryType.js").default,
  *                function(import("../render/canvas/BuilderGroup.js").default, import("../geom/Geometry.js").default,
- *                         import("../style/Style.js").default, Object)>}
+ *                         import("../style/Style.js").default, Object): void>}
  */
 const GEOMETRY_RENDERERS = {
   'Point': renderPointGeometry,
@@ -91,7 +91,7 @@ function renderCircleGeometry(builderGroup, geometry, style, feature) {
  * @param {import("../Feature.js").FeatureLike} feature Feature.
  * @param {import("../style/Style.js").default} style Style.
  * @param {number} squaredTolerance Squared tolerance.
- * @param {function(this: T, import("../events/Event.js").default)} listener Listener function.
+ * @param {function(this: T, import("../events/Event.js").default): void} listener Listener function.
  * @param {T} thisArg Value to use as `this` when executing `listener`.
  * @return {boolean} `true` if style is loading.
  * @template T
diff --git a/src/ol/source/UTFGrid.js b/src/ol/source/UTFGrid.js
index b12cff8e1e..6f90ab454c 100644
--- a/src/ol/source/UTFGrid.js
+++ b/src/ol/source/UTFGrid.js
@@ -138,7 +138,7 @@ export class CustomTile extends Tile {
    * Calls the callback (synchronously by default) with the available data
    * for given coordinate (or `null` if not yet loaded).
    * @param {import("../coordinate.js").Coordinate} coordinate Coordinate.
-   * @param {function(this: T, *)} callback Callback.
+   * @param {function(this: T, *): void} callback Callback.
    * @param {T=} opt_this The object to use as `this` in the callback.
    * @param {boolean=} opt_request If `true` the callback is always async.
    *                               The tile data is requested if not yet loaded.
@@ -379,7 +379,7 @@ class UTFGrid extends TileSource {
    * in case of an error).
    * @param {import("../coordinate.js").Coordinate} coordinate Coordinate.
    * @param {number} resolution Resolution.
-   * @param {function(*)} callback Callback.
+   * @param {function(*): void} callback Callback.
    * @param {boolean=} opt_request If `true` the callback is always async.
    *                               The tile data is requested if not yet loaded.
    * @api
diff --git a/src/ol/style/Atlas.js b/src/ol/style/Atlas.js
index a2fbbd71e2..b29cd566ee 100644
--- a/src/ol/style/Atlas.js
+++ b/src/ol/style/Atlas.js
@@ -93,7 +93,7 @@ class Atlas {
    * @param {string} id The identifier of the entry to add.
    * @param {number} width The width.
    * @param {number} height The height.
-   * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
+   * @param {function(CanvasRenderingContext2D, number, number): void} renderCallback
    *    Called to render the new image onto an atlas image.
    * @param {Object=} opt_this Value to use as `this` when executing
    *    `renderCallback`.
diff --git a/src/ol/style/AtlasManager.js b/src/ol/style/AtlasManager.js
index 5b3d12cad1..495ffd8c7d 100644
--- a/src/ol/style/AtlasManager.js
+++ b/src/ol/style/AtlasManager.js
@@ -174,7 +174,7 @@ class AtlasManager {
    * @param {string} id The identifier of the entry to add.
    * @param {number} width The width.
    * @param {number} height The height.
-   * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
+   * @param {function(CanvasRenderingContext2D, number, number): void} renderCallback
    *    Called to render the new image onto an atlas image.
    * @param {function(CanvasRenderingContext2D, number, number)=} opt_renderHitCallback Called to render a hit-detection image onto a hit
    *    detection atlas image.
@@ -213,7 +213,7 @@ class AtlasManager {
    * @param {string} id The identifier of the entry to add.
    * @param {number} width The width.
    * @param {number} height The height.
-   * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
+   * @param {function(CanvasRenderingContext2D, number, number): void} renderCallback
    *    Called to render the new image onto an atlas image.
    * @param {Object=} opt_this Value to use as `this` when executing
    *    `renderCallback` and `renderHitCallback`.
diff --git a/src/ol/style/Image.js b/src/ol/style/Image.js
index cd962418f3..05894005c1 100644
--- a/src/ol/style/Image.js
+++ b/src/ol/style/Image.js
@@ -233,7 +233,7 @@ class ImageStyle {
 
   /**
    * @abstract
-   * @param {function(this: T, import("../events/Event.js").default)} listener Listener function.
+   * @param {function(this: T, import("../events/Event.js").default): void} listener Listener function.
    * @param {T} thisArg Value to use as `this` when executing `listener`.
    * @return {import("../events.js").EventsKey|undefined} Listener key.
    * @template T
@@ -252,7 +252,7 @@ class ImageStyle {
 
   /**
    * @abstract
-   * @param {function(this: T, import("../events/Event.js").default)} listener Listener function.
+   * @param {function(this: T, import("../events/Event.js").default): void} listener Listener function.
    * @param {T} thisArg Value to use as `this` when executing `listener`.
    * @template T
    */
diff --git a/src/ol/style/Style.js b/src/ol/style/Style.js
index a76122a50b..ed7e53eec9 100644
--- a/src/ol/style/Style.js
+++ b/src/ol/style/Style.js
@@ -122,7 +122,7 @@ import Stroke from './Stroke.js';
  * 1. The pixel coordinates of the geometry in GeoJSON notation.
  * 2. The {@link module:ol/render~State} of the layer renderer.
  *
- * @typedef {function((import("../coordinate.js").Coordinate|Array<import("../coordinate.js").Coordinate>|Array<Array<import("../coordinate.js").Coordinate>>),import("../render.js").State)}
+ * @typedef {function((import("../coordinate.js").Coordinate|Array<import("../coordinate.js").Coordinate>|Array<Array<import("../coordinate.js").Coordinate>>),import("../render.js").State): void}
  * RenderFunction
  */
 
diff --git a/src/ol/tilegrid/TileGrid.js b/src/ol/tilegrid/TileGrid.js
index 05b438bf54..6a7bc89c1d 100644
--- a/src/ol/tilegrid/TileGrid.js
+++ b/src/ol/tilegrid/TileGrid.js
@@ -189,7 +189,7 @@ class TileGrid {
    *
    * @param {import("../extent.js").Extent} extent Extent.
    * @param {number} zoom Integer zoom level.
-   * @param {function(import("../tilecoord.js").TileCoord)} callback Function called with each tile coordinate.
+   * @param {function(import("../tilecoord.js").TileCoord): void} callback Function called with each tile coordinate.
    * @api
    */
   forEachTileCoord(extent, zoom, callback) {
diff --git a/src/ol/xml.js b/src/ol/xml.js
index 8c262f9bc7..c46ce8568d 100644
--- a/src/ol/xml.js
+++ b/src/ol/xml.js
@@ -14,12 +14,12 @@ import {extend} from './array.js';
 
 
 /**
- * @typedef {function(Element, Array<*>)} Parser
+ * @typedef {function(Element, Array<*>): void} Parser
  */
 
 
 /**
- * @typedef {function(Element, *, Array<*>)} Serializer
+ * @typedef {function(Element, *, Array<*>): void} Serializer
  */
 
 
@@ -252,7 +252,7 @@ export function makeObjectPropertySetter(valueReader, opt_property, opt_this) {
  * Create a serializer that appends nodes written by its `nodeWriter` to its
  * designated parent. The parent is the `node` of the
  * {@link module:ol/xml~NodeStackItem} at the top of the `objectStack`.
- * @param {function(this: T, Node, V, Array<*>)} nodeWriter Node writer.
+ * @param {function(this: T, Node, V, Array<*>): void} nodeWriter Node writer.
  * @param {T=} opt_this The object to use as `this` in `nodeWriter`.
  * @return {Serializer} Serializer.
  * @template T, V
@@ -274,7 +274,7 @@ export function makeChildAppender(nodeWriter, opt_this) {
  * designed to serialize a single item. An example would be a LineString
  * geometry writer, which could be reused for writing MultiLineString
  * geometries.
- * @param {function(this: T, Element, V, Array<*>)} nodeWriter Node writer.
+ * @param {function(this: T, Element, V, Array<*>): void} nodeWriter Node writer.
  * @param {T=} opt_this The object to use as `this` in `nodeWriter`.
  * @return {Serializer} Serializer.
  * @template T, V