diff --git a/src/ol/interaction/DragPan.js b/src/ol/interaction/DragPan.js
index 055b876e90..6bbb073f9f 100644
--- a/src/ol/interaction/DragPan.js
+++ b/src/ol/interaction/DragPan.js
@@ -7,7 +7,7 @@ import {scale as scaleCoordinate, rotate as rotateCoordinate, add as addCoordina
 import {easeOut} from '../easing.js';
 import {noModifierKeys} from '../events/condition.js';
 import {FALSE} from '../functions.js';
-import PointerInteraction from '../interaction/Pointer.js';
+import PointerInteraction, {centroid as centroidFromPointers} from '../interaction/Pointer.js';
 
 /**
  * @classdesc
@@ -67,7 +67,7 @@ inherits(DragPan, PointerInteraction);
  */
 function handleDragEvent(mapBrowserEvent) {
   const targetPointers = this.targetPointers;
-  const centroid = PointerInteraction.centroid(targetPointers);
+  const centroid = centroidFromPointers(targetPointers);
   if (targetPointers.length == this.lastPointersCount_) {
     if (this.kinetic_) {
       this.kinetic_.update(centroid[0], centroid[1]);
diff --git a/src/ol/interaction/PinchRotate.js b/src/ol/interaction/PinchRotate.js
index e63151bad6..88dfe0dd49 100644
--- a/src/ol/interaction/PinchRotate.js
+++ b/src/ol/interaction/PinchRotate.js
@@ -5,7 +5,7 @@ import {inherits} from '../index.js';
 import ViewHint from '../ViewHint.js';
 import {FALSE} from '../functions.js';
 import Interaction from '../interaction/Interaction.js';
-import PointerInteraction from '../interaction/Pointer.js';
+import PointerInteraction, {centroid as centroidFromPointers} from '../interaction/Pointer.js';
 import {disable} from '../rotationconstraint.js';
 
 /**
@@ -105,7 +105,7 @@ function handleDragEvent(mapBrowserEvent) {
   // FIXME: should be the intersection point between the lines:
   //     touch0,touch1 and previousTouch0,previousTouch1
   const viewportPosition = map.getViewport().getBoundingClientRect();
-  const centroid = PointerInteraction.centroid(this.targetPointers);
+  const centroid = centroidFromPointers(this.targetPointers);
   centroid[0] -= viewportPosition.left;
   centroid[1] -= viewportPosition.top;
   this.anchor_ = map.getCoordinateFromPixel(centroid);
diff --git a/src/ol/interaction/PinchZoom.js b/src/ol/interaction/PinchZoom.js
index 6dcaf30c99..13989c7538 100644
--- a/src/ol/interaction/PinchZoom.js
+++ b/src/ol/interaction/PinchZoom.js
@@ -5,7 +5,7 @@ import {inherits} from '../index.js';
 import ViewHint from '../ViewHint.js';
 import {FALSE} from '../functions.js';
 import Interaction from '../interaction/Interaction.js';
-import PointerInteraction from '../interaction/Pointer.js';
+import PointerInteraction, {centroid as centroidFromPointers} from '../interaction/Pointer.js';
 
 /**
  * @classdesc
@@ -103,7 +103,7 @@ function handleDragEvent(mapBrowserEvent) {
 
   // scale anchor point.
   const viewportPosition = map.getViewport().getBoundingClientRect();
-  const centroid = PointerInteraction.centroid(this.targetPointers);
+  const centroid = centroidFromPointers(this.targetPointers);
   centroid[0] -= viewportPosition.left;
   centroid[1] -= viewportPosition.top;
   this.anchor_ = map.getCoordinateFromPixel(centroid);
diff --git a/src/ol/interaction/Pointer.js b/src/ol/interaction/Pointer.js
index bd8a84e6dc..716eaef346 100644
--- a/src/ol/interaction/Pointer.js
+++ b/src/ol/interaction/Pointer.js
@@ -86,7 +86,7 @@ inherits(PointerInteraction, Interaction);
  * @param {Array.<ol.pointer.PointerEvent>} pointerEvents List of events.
  * @return {ol.Pixel} Centroid pixel.
  */
-PointerInteraction.centroid = function(pointerEvents) {
+export function centroid(pointerEvents) {
   const length = pointerEvents.length;
   let clientX = 0;
   let clientY = 0;
@@ -95,21 +95,20 @@ PointerInteraction.centroid = function(pointerEvents) {
     clientY += pointerEvents[i].clientY;
   }
   return [clientX / length, clientY / length];
-};
+}
 
 
 /**
  * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
  * @return {boolean} Whether the event is a pointerdown, pointerdrag
  *     or pointerup event.
- * @private
  */
-PointerInteraction.prototype.isPointerDraggingEvent_ = function(mapBrowserEvent) {
+function isPointerDraggingEvent(mapBrowserEvent) {
   const type = mapBrowserEvent.type;
   return type === MapBrowserEventType.POINTERDOWN ||
     type === MapBrowserEventType.POINTERDRAG ||
     type === MapBrowserEventType.POINTERUP;
-};
+}
 
 
 /**
@@ -117,7 +116,7 @@ PointerInteraction.prototype.isPointerDraggingEvent_ = function(mapBrowserEvent)
  * @private
  */
 PointerInteraction.prototype.updateTrackedPointers_ = function(mapBrowserEvent) {
-  if (this.isPointerDraggingEvent_(mapBrowserEvent)) {
+  if (isPointerDraggingEvent(mapBrowserEvent)) {
     const event = mapBrowserEvent.pointerEvent;
 
     const id = event.pointerId.toString();
diff --git a/src/ol/style/Icon.js b/src/ol/style/Icon.js
index 2e299f0cb1..d99acb4f8b 100644
--- a/src/ol/style/Icon.js
+++ b/src/ol/style/Icon.js
@@ -8,7 +8,7 @@ import {asArray} from '../color.js';
 import {listen, unlisten} from '../events.js';
 import EventType from '../events/EventType.js';
 import IconAnchorUnits from '../style/IconAnchorUnits.js';
-import IconImage from '../style/IconImage.js';
+import {get as getIconImage} from '../style/IconImage.js';
 import IconOrigin from '../style/IconOrigin.js';
 import ImageStyle from '../style/Image.js';
 
@@ -107,7 +107,7 @@ const Icon = function(opt_options) {
    * @private
    * @type {ol.style.IconImage}
    */
-  this.iconImage_ = IconImage.get(
+  this.iconImage_ = getIconImage(
     image, /** @type {string} */ (src), imgSize, this.crossOrigin_, imageState, this.color_);
 
   /**
diff --git a/src/ol/style/IconImage.js b/src/ol/style/IconImage.js
index 15d46aef26..311b64660e 100644
--- a/src/ol/style/IconImage.js
+++ b/src/ol/style/IconImage.js
@@ -19,8 +19,7 @@ import {iconImageCache} from '../style.js';
  * @param {ol.Color} color Color.
  * @extends {ol.events.EventTarget}
  */
-const IconImage = function(image, src, size, crossOrigin, imageState,
-  color) {
+const IconImage = function(image, src, size, crossOrigin, imageState, color) {
 
   EventTarget.call(this);
 
@@ -101,16 +100,14 @@ inherits(IconImage, EventTarget);
  * @param {ol.Color} color Color.
  * @return {ol.style.IconImage} Icon image.
  */
-IconImage.get = function(image, src, size, crossOrigin, imageState,
-  color) {
+export function get(image, src, size, crossOrigin, imageState, color) {
   let iconImage = iconImageCache.get(src, crossOrigin, color);
   if (!iconImage) {
-    iconImage = new IconImage(
-      image, src, size, crossOrigin, imageState, color);
+    iconImage = new IconImage(image, src, size, crossOrigin, imageState, color);
     iconImageCache.set(src, crossOrigin, color, iconImage);
   }
   return iconImage;
-};
+}
 
 
 /**
diff --git a/test/spec/ol/style/icon.test.js b/test/spec/ol/style/icon.test.js
index 4331e273fc..b999513480 100644
--- a/test/spec/ol/style/icon.test.js
+++ b/test/spec/ol/style/icon.test.js
@@ -1,7 +1,7 @@
 import {getUid} from '../../../../src/ol/index.js';
 import {iconImageCache} from '../../../../src/ol/style.js';
 import Icon from '../../../../src/ol/style/Icon.js';
-import IconImage from '../../../../src/ol/style/IconImage.js';
+import IconImage, {get as getIconImage} from '../../../../src/ol/style/IconImage.js';
 
 
 describe('ol.style.Icon', function() {
@@ -17,8 +17,7 @@ describe('ol.style.Icon', function() {
         img: canvas,
         imgSize: size
       });
-      expect(IconImage.get(
-        canvas, getUid(canvas), size, '').getImage()).to.eql(canvas);
+      expect(getIconImage(canvas, getUid(canvas), size, '').getImage()).to.eql(canvas);
     });
 
     it('imgSize overrides img.width and img.height', function(done) {