diff --git a/examples/feature-animation.js b/examples/feature-animation.js
index 1908d9acb1..439826721e 100644
--- a/examples/feature-animation.js
+++ b/examples/feature-animation.js
@@ -1,6 +1,6 @@
 import Feature from '../src/ol/Feature.js';
 import Map from '../src/ol/Map.js';
-import Observable from '../src/ol/Observable.js';
+import {unByKey} from '../src/ol/Observable.js';
 import View from '../src/ol/View.js';
 import {defaults as defaultControls} from '../src/ol/control.js';
 import {easeOut} from '../src/ol/easing.js';
@@ -80,7 +80,7 @@ function flash(feature) {
     vectorContext.setStyle(style);
     vectorContext.drawGeometry(flashGeom);
     if (elapsed > duration) {
-      Observable.unByKey(listenerKey);
+      unByKey(listenerKey);
       return;
     }
     // tell OpenLayers to continue postcompose animation
diff --git a/examples/measure.js b/examples/measure.js
index 943053cdcf..abcea9abb2 100644
--- a/examples/measure.js
+++ b/examples/measure.js
@@ -1,5 +1,5 @@
 import Map from '../src/ol/Map.js';
-import Observable from '../src/ol/Observable.js';
+import {unByKey} from '../src/ol/Observable.js';
 import Overlay from '../src/ol/Overlay.js';
 import {getArea, getLength} from '../src/ol/sphere.js';
 import View from '../src/ol/View.js';
@@ -238,7 +238,7 @@ function addInteraction() {
       // unset tooltip so that a new one can be created
       measureTooltipElement = null;
       createMeasureTooltip();
-      Observable.unByKey(listener);
+      unByKey(listener);
     }, this);
 }
 
diff --git a/src/ol/Observable.js b/src/ol/Observable.js
index d63526676f..19857e462b 100644
--- a/src/ol/Observable.js
+++ b/src/ol/Observable.js
@@ -41,7 +41,7 @@ inherits(Observable, EventTarget);
  *     or `once()` (or an array of keys).
  * @api
  */
-Observable.unByKey = function(key) {
+export function unByKey(key) {
   if (Array.isArray(key)) {
     for (let i = 0, ii = key.length; i < ii; ++i) {
       unlistenByKey(key[i]);
@@ -49,7 +49,7 @@ Observable.unByKey = function(key) {
   } else {
     unlistenByKey(/** @type {ol.EventsKey} */ (key));
   }
-};
+}
 
 
 /**
diff --git a/src/ol/TileRange.js b/src/ol/TileRange.js
index 57f3930df3..8aaabaf6f4 100644
--- a/src/ol/TileRange.js
+++ b/src/ol/TileRange.js
@@ -45,7 +45,7 @@ const TileRange = function(minX, maxX, minY, maxY) {
  * @param {ol.TileRange|undefined} tileRange TileRange.
  * @return {ol.TileRange} Tile range.
  */
-TileRange.createOrUpdate = function(minX, maxX, minY, maxY, tileRange) {
+export function createOrUpdate(minX, maxX, minY, maxY, tileRange) {
   if (tileRange !== undefined) {
     tileRange.minX = minX;
     tileRange.maxX = maxX;
@@ -55,7 +55,7 @@ TileRange.createOrUpdate = function(minX, maxX, minY, maxY, tileRange) {
   } else {
     return new TileRange(minX, maxX, minY, maxY);
   }
-};
+}
 
 
 /**
diff --git a/src/ol/View.js b/src/ol/View.js
index 34adb308d7..2fcd51bc33 100644
--- a/src/ol/View.js
+++ b/src/ol/View.js
@@ -339,7 +339,7 @@ View.prototype.animate = function(var_args) {
     animation.callback = callback;
 
     // check if animation is a no-op
-    if (View.isNoopAnimation(animation)) {
+    if (isNoopAnimation(animation)) {
       animation.complete = true;
       // we still push it onto the series for callback handling
     } else {
@@ -1204,7 +1204,7 @@ export function createRotationConstraint(options) {
  * @param {ol.ViewAnimation} animation The animation.
  * @return {boolean} The animation involves no view change.
  */
-View.isNoopAnimation = function(animation) {
+export function isNoopAnimation(animation) {
   if (animation.sourceCenter && animation.targetCenter) {
     if (!coordinatesEqual(animation.sourceCenter, animation.targetCenter)) {
       return false;
@@ -1217,5 +1217,6 @@ View.isNoopAnimation = function(animation) {
     return false;
   }
   return true;
-};
+}
+
 export default View;
diff --git a/src/ol/render/canvas/ReplayGroup.js b/src/ol/render/canvas/ReplayGroup.js
index 21d31ce01c..d8d7df604b 100644
--- a/src/ol/render/canvas/ReplayGroup.js
+++ b/src/ol/render/canvas/ReplayGroup.js
@@ -204,7 +204,7 @@ export function getCircleArray(radius) {
  * @param {CanvasRenderingContext2D} context Context.
  * @param {number} rotation Rotation.
  */
-CanvasReplayGroup.replayDeclutter = function(declutterReplays, context, rotation) {
+export function replayDeclutter(declutterReplays, context, rotation) {
   const zs = Object.keys(declutterReplays).map(Number).sort(numberSafeCompareFunction);
   const skippedFeatureUids = {};
   for (let z = 0, zz = zs.length; z < zz; ++z) {
@@ -215,7 +215,7 @@ CanvasReplayGroup.replayDeclutter = function(declutterReplays, context, rotation
       replay.replay(context, transform, rotation, skippedFeatureUids);
     }
   }
-};
+}
 
 
 /**
diff --git a/src/ol/render/canvas/TextReplay.js b/src/ol/render/canvas/TextReplay.js
index 82db004ef8..e3131e23cf 100644
--- a/src/ol/render/canvas/TextReplay.js
+++ b/src/ol/render/canvas/TextReplay.js
@@ -143,17 +143,16 @@ inherits(CanvasTextReplay, CanvasReplay);
  * each line.
  * @return {number} Width of the whole text.
  */
-CanvasTextReplay.measureTextWidths = function(font, lines, widths) {
+export function measureTextWidths(font, lines, widths) {
   const numLines = lines.length;
   let width = 0;
-  let currentWidth, i;
-  for (i = 0; i < numLines; ++i) {
-    currentWidth = measureTextWidth(font, lines[i]);
+  for (let i = 0; i < numLines; ++i) {
+    const currentWidth = measureTextWidth(font, lines[i]);
     width = Math.max(width, currentWidth);
     widths.push(currentWidth);
   }
   return width;
-};
+}
 
 
 /**
@@ -296,7 +295,7 @@ CanvasTextReplay.prototype.getImage = function(text, textKey, fillKey, strokeKey
     const lines = text.split('\n');
     const numLines = lines.length;
     const widths = [];
-    const width = CanvasTextReplay.measureTextWidths(textState.font, lines, widths);
+    const width = measureTextWidths(textState.font, lines, widths);
     const lineHeight = measureTextHeight(textState.font);
     const height = lineHeight * numLines;
     const renderWidth = (width + strokeWidth);
diff --git a/src/ol/renderer/canvas/VectorTileLayer.js b/src/ol/renderer/canvas/VectorTileLayer.js
index 0550e8f86a..51cc0f6f5b 100644
--- a/src/ol/renderer/canvas/VectorTileLayer.js
+++ b/src/ol/renderer/canvas/VectorTileLayer.js
@@ -14,7 +14,7 @@ import {equivalent as equivalentProjection} from '../../proj.js';
 import Units from '../../proj/Units.js';
 import ReplayType from '../../render/ReplayType.js';
 import {labelCache, rotateAtOffset} from '../../render/canvas.js';
-import CanvasReplayGroup from '../../render/canvas/ReplayGroup.js';
+import CanvasReplayGroup, {replayDeclutter} from '../../render/canvas/ReplayGroup.js';
 import {ORDER} from '../../render/replay.js';
 import RendererType from '../Type.js';
 import CanvasTileLayerRenderer from '../canvas/TileLayer.js';
@@ -436,7 +436,7 @@ CanvasVectorTileLayerRenderer.prototype.postCompose = function(context, frameSta
     }
   }
   if (declutterReplays) {
-    CanvasReplayGroup.replayDeclutter(declutterReplays, context, rotation);
+    replayDeclutter(declutterReplays, context, rotation);
   }
   if (rotation) {
     rotateAtOffset(context, rotation,
diff --git a/src/ol/tilegrid/TileGrid.js b/src/ol/tilegrid/TileGrid.js
index 31b2c57f2f..cac0b7f314 100644
--- a/src/ol/tilegrid/TileGrid.js
+++ b/src/ol/tilegrid/TileGrid.js
@@ -3,12 +3,12 @@
  */
 import {DEFAULT_TILE_SIZE} from './common.js';
 import {assert} from '../asserts.js';
-import TileRange from '../TileRange.js';
+import TileRange, {createOrUpdate as createOrUpdateTileRange} from '../TileRange.js';
 import {isSorted, linearFindNearest} from '../array.js';
 import {createOrUpdate, getTopLeft} from '../extent.js';
 import {clamp} from '../math.js';
 import {toSize} from '../size.js';
-import {createOrUpdate as tileCoordCreateOrUpdate} from '../tilecoord.js';
+import {createOrUpdate as createOrUpdateTileCoord} from '../tilecoord.js';
 
 /**
  * @classdesc
@@ -199,7 +199,7 @@ TileGrid.prototype.forEachTileCoordParentTileRange = function(tileCoord, callbac
     if (this.zoomFactor_ === 2) {
       x = Math.floor(x / 2);
       y = Math.floor(y / 2);
-      tileRange = TileRange.createOrUpdate(x, x, y, y, opt_tileRange);
+      tileRange = createOrUpdateTileRange(x, x, y, y, opt_tileRange);
     } else {
       tileRange = this.getTileRangeForExtentAndZ(tileCoordExtent, z, opt_tileRange);
     }
@@ -288,7 +288,7 @@ TileGrid.prototype.getTileCoordChildTileRange = function(tileCoord, opt_tileRang
     if (this.zoomFactor_ === 2) {
       const minX = tileCoord[1] * 2;
       const minY = tileCoord[2] * 2;
-      return TileRange.createOrUpdate(minX, minX + 1, minY, minY + 1, opt_tileRange);
+      return createOrUpdateTileRange(minX, minX + 1, minY, minY + 1, opt_tileRange);
     }
     const tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);
     return this.getTileRangeForExtentAndZ(
@@ -330,8 +330,7 @@ TileGrid.prototype.getTileRangeForExtentAndZ = function(extent, z, opt_tileRange
   const minX = tileCoord[1];
   const minY = tileCoord[2];
   this.getTileCoordForXYAndZ_(extent[2], extent[3], z, true, tileCoord);
-  return TileRange.createOrUpdate(
-    minX, tileCoord[1], minY, tileCoord[2], opt_tileRange);
+  return createOrUpdateTileRange(minX, tileCoord[1], minY, tileCoord[2], opt_tileRange);
 };
 
 
@@ -422,7 +421,7 @@ TileGrid.prototype.getTileCoordForXYAndResolution_ = function(
     tileCoordY = Math.floor(tileCoordY);
   }
 
-  return tileCoordCreateOrUpdate(z, tileCoordX, tileCoordY, opt_tileCoord);
+  return createOrUpdateTileCoord(z, tileCoordX, tileCoordY, opt_tileCoord);
 };
 
 
@@ -461,7 +460,7 @@ TileGrid.prototype.getTileCoordForXYAndZ_ = function(x, y, z, reverseIntersectio
     tileCoordY = Math.floor(tileCoordY);
   }
 
-  return tileCoordCreateOrUpdate(z, tileCoordX, tileCoordY, opt_tileCoord);
+  return createOrUpdateTileCoord(z, tileCoordX, tileCoordY, opt_tileCoord);
 };
 
 
diff --git a/test/spec/ol/observable.test.js b/test/spec/ol/observable.test.js
index 4a469735f9..f9f1006d64 100644
--- a/test/spec/ol/observable.test.js
+++ b/test/spec/ol/observable.test.js
@@ -1,5 +1,5 @@
 import EventTarget from '../../../src/ol/events/EventTarget.js';
-import Observable from '../../../src/ol/Observable.js';
+import Observable, {unByKey} from '../../../src/ol/Observable.js';
 
 
 describe('ol.Observable', function() {
@@ -138,7 +138,7 @@ describe('ol.Observable', function() {
       observable.dispatchEvent('foo');
       expect(listener.calledOnce).to.be(true);
 
-      Observable.unByKey(key);
+      unByKey(key);
       observable.dispatchEvent('foo');
       expect(listener.callCount).to.be(1);
     });
diff --git a/test/spec/ol/source/bingmaps.test.js b/test/spec/ol/source/bingmaps.test.js
index 06361a6262..1823b89e67 100644
--- a/test/spec/ol/source/bingmaps.test.js
+++ b/test/spec/ol/source/bingmaps.test.js
@@ -1,6 +1,6 @@
 import BingMaps from '../../../../src/ol/source/BingMaps.js';
 import {quadKey} from '../../../../src/ol/tilecoord.js';
-import Observable from '../../../../src/ol/Observable.js';
+import {unByKey} from '../../../../src/ol/Observable.js';
 
 
 describe('ol.source.BingMaps', function() {
@@ -24,7 +24,7 @@ describe('ol.source.BingMaps', function() {
 
       const key = source.on('change', function() {
         if (source.getState() === 'ready') {
-          Observable.unByKey(key);
+          unByKey(key);
           tileGrid = source.getTileGrid();
           done();
         }
diff --git a/test/spec/ol/source/tilejson.test.js b/test/spec/ol/source/tilejson.test.js
index 912eafed26..8ce5cd43fb 100644
--- a/test/spec/ol/source/tilejson.test.js
+++ b/test/spec/ol/source/tilejson.test.js
@@ -1,6 +1,6 @@
 import Source from '../../../../src/ol/source/Source.js';
 import TileJSON from '../../../../src/ol/source/TileJSON.js';
-import Observable from '../../../../src/ol/Observable.js';
+import {unByKey} from '../../../../src/ol/Observable.js';
 
 
 describe('ol.source.TileJSON', function() {
@@ -115,7 +115,7 @@ describe('ol.source.TileJSON', function() {
       });
       const key = source.on('change', function() {
         if (source.getState() === 'ready') {
-          Observable.unByKey(key);
+          unByKey(key);
           tileGrid = source.getTileGrid();
           done();
         }
diff --git a/test/spec/ol/view.test.js b/test/spec/ol/view.test.js
index c024db66b0..321c69667c 100644
--- a/test/spec/ol/view.test.js
+++ b/test/spec/ol/view.test.js
@@ -1,5 +1,8 @@
 import Map from '../../../src/ol/Map.js';
-import View, {createCenterConstraint, createResolutionConstraint, createRotationConstraint} from '../../../src/ol/View.js';
+import View, {
+  createCenterConstraint, createResolutionConstraint, createRotationConstraint,
+  isNoopAnimation
+} from '../../../src/ol/View.js';
 import ViewHint from '../../../src/ol/ViewHint.js';
 import {createEmpty} from '../../../src/ol/extent.js';
 import Circle from '../../../src/ol/geom/Circle.js';
@@ -1485,7 +1488,7 @@ describe('ol.View.isNoopAnimation()', function() {
 
   cases.forEach(function(c, i) {
     it('works for case ' + i, function() {
-      const noop = View.isNoopAnimation(c.animation);
+      const noop = isNoopAnimation(c.animation);
       expect(noop).to.equal(c.noop);
     });
   });