diff --git a/src/ol/CanvasMap.js b/src/ol/CanvasMap.js
index b43fae5ac4..16f0ffa828 100644
--- a/src/ol/CanvasMap.js
+++ b/src/ol/CanvasMap.js
@@ -6,7 +6,7 @@ import PluggableMap from './PluggableMap.js';
 import PluginType from './PluginType.js';
 import {defaults as defaultControls} from './control.js';
 import {defaults as defaultInteractions} from './interaction.js';
-import _ol_obj_ from './obj.js';
+import {assign} from './obj.js';
 import {register, registerMultiple} from './plugins.js';
 import CanvasImageLayerRenderer from './renderer/canvas/ImageLayer.js';
 import CanvasMapRenderer from './renderer/canvas/Map.js';
@@ -73,7 +73,7 @@ registerMultiple(PluginType.LAYER_RENDERER, [
  * @api
  */
 const CanvasMap = function(options) {
-  options = _ol_obj_.assign({}, options);
+  options = assign({}, options);
   delete options.renderer;
   if (!options.controls) {
     options.controls = defaultControls();
diff --git a/src/ol/Map.js b/src/ol/Map.js
index c4a6647883..50035aeb57 100644
--- a/src/ol/Map.js
+++ b/src/ol/Map.js
@@ -6,7 +6,7 @@ import PluggableMap from './PluggableMap.js';
 import PluginType from './PluginType.js';
 import {defaults as defaultControls} from './control.js';
 import {defaults as defaultInteractions} from './interaction.js';
-import _ol_obj_ from './obj.js';
+import {assign} from './obj.js';
 import {register, registerMultiple} from './plugins.js';
 import CanvasImageLayerRenderer from './renderer/canvas/ImageLayer.js';
 import CanvasMapRenderer from './renderer/canvas/Map.js';
@@ -85,7 +85,7 @@ registerMultiple(PluginType.LAYER_RENDERER, [
  * @api
  */
 const Map = function(options) {
-  options = _ol_obj_.assign({}, options);
+  options = assign({}, options);
   if (!options.controls) {
     options.controls = defaultControls();
   }
diff --git a/src/ol/Object.js b/src/ol/Object.js
index f8d3b7d785..4d07db7b78 100644
--- a/src/ol/Object.js
+++ b/src/ol/Object.js
@@ -5,7 +5,7 @@ import {getUid, inherits} from './index.js';
 import ObjectEventType from './ObjectEventType.js';
 import Observable from './Observable.js';
 import Event from './events/Event.js';
-import _ol_obj_ from './obj.js';
+import {assign} from './obj.js';
 
 /**
  * @classdesc
@@ -124,7 +124,7 @@ BaseObject.prototype.getKeys = function() {
  * @api
  */
 BaseObject.prototype.getProperties = function() {
-  return _ol_obj_.assign({}, this.values_);
+  return assign({}, this.values_);
 };
 
 
diff --git a/src/ol/View.js b/src/ol/View.js
index d3f30e86e8..82af07c54a 100644
--- a/src/ol/View.js
+++ b/src/ol/View.js
@@ -18,7 +18,7 @@ import GeometryType from './geom/GeometryType.js';
 import {fromExtent as polygonFromExtent} from './geom/Polygon.js';
 import SimpleGeometry from './geom/SimpleGeometry.js';
 import {clamp, modulo} from './math.js';
-import _ol_obj_ from './obj.js';
+import {assign} from './obj.js';
 import {createProjection, METERS_PER_UNIT} from './proj.js';
 import Units from './proj/Units.js';
 
@@ -89,7 +89,7 @@ const DEFAULT_MIN_ZOOM = 0;
 const View = function(opt_options) {
   BaseObject.call(this);
 
-  const options = _ol_obj_.assign({}, opt_options);
+  const options = assign({}, opt_options);
 
   /**
    * @private
@@ -217,7 +217,7 @@ View.prototype.applyOptions_ = function(options) {
  * @return {olx.ViewOptions} New options updated with the current view state.
  */
 View.prototype.getUpdatedOptions_ = function(newOptions) {
-  const options = _ol_obj_.assign({}, this.options_);
+  const options = assign({}, this.options_);
 
   // preserve resolution (or zoom)
   if (options.resolution !== undefined) {
@@ -232,7 +232,7 @@ View.prototype.getUpdatedOptions_ = function(newOptions) {
   // preserve rotation
   options.rotation = this.getRotation();
 
-  return _ol_obj_.assign({}, options, newOptions);
+  return assign({}, options, newOptions);
 };
 
 
diff --git a/src/ol/events.js b/src/ol/events.js
index 76e0f570ee..d52702e25d 100644
--- a/src/ol/events.js
+++ b/src/ol/events.js
@@ -1,7 +1,7 @@
 /**
  * @module ol/events
  */
-import _ol_obj_ from './obj.js';
+import {clear} from './obj.js';
 const _ol_events_ = {};
 
 
@@ -93,7 +93,7 @@ _ol_events_.removeListeners_ = function(target, type) {
   if (listeners) {
     for (let i = 0, ii = listeners.length; i < ii; ++i) {
       target.removeEventListener(type, listeners[i].boundListener);
-      _ol_obj_.clear(listeners[i]);
+      clear(listeners[i]);
     }
     listeners.length = 0;
     const listenerMap = target.ol_lm;
@@ -223,7 +223,7 @@ _ol_events_.unlistenByKey = function(key) {
         _ol_events_.removeListeners_(key.target, key.type);
       }
     }
-    _ol_obj_.clear(key);
+    clear(key);
   }
 };
 
diff --git a/src/ol/format/EsriJSON.js b/src/ol/format/EsriJSON.js
index 7d270a23fa..ce0f6111ec 100644
--- a/src/ol/format/EsriJSON.js
+++ b/src/ol/format/EsriJSON.js
@@ -18,7 +18,7 @@ import Point from '../geom/Point.js';
 import Polygon from '../geom/Polygon.js';
 import _ol_geom_flat_deflate_ from '../geom/flat/deflate.js';
 import _ol_geom_flat_orient_ from '../geom/flat/orient.js';
-import _ol_obj_ from '../obj.js';
+import {assign, isEmpty} from '../obj.js';
 import {get as getProjection} from '../proj.js';
 
 /**
@@ -73,7 +73,7 @@ EsriJSON.readGeometry_ = function(object, opt_options) {
   } else if (object.rings) {
     const layout = EsriJSON.getGeometryLayout_(object);
     const rings = EsriJSON.convertRings_(object.rings, layout);
-    object = /** @type {EsriJSONGeometry} */(_ol_obj_.assign({}, object));
+    object = /** @type {EsriJSONGeometry} */(assign({}, object));
     if (rings.length === 1) {
       type = GeometryType.POLYGON;
       object.rings = rings[0];
@@ -632,7 +632,7 @@ EsriJSON.prototype.writeFeatureObject = function(
   }
   const properties = feature.getProperties();
   delete properties[feature.getGeometryName()];
-  if (!_ol_obj_.isEmpty(properties)) {
+  if (!isEmpty(properties)) {
     object['attributes'] = properties;
   } else {
     object['attributes'] = {};
diff --git a/src/ol/format/Feature.js b/src/ol/format/Feature.js
index 803d40740a..af12784f1b 100644
--- a/src/ol/format/Feature.js
+++ b/src/ol/format/Feature.js
@@ -2,7 +2,7 @@
  * @module ol/format/Feature
  */
 import Geometry from '../geom/Geometry.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import {get as getProjection, equivalent as equivalentProjection, transformExtent} from '../proj.js';
 
 /**
@@ -65,7 +65,7 @@ FeatureFormat.prototype.getReadOptions = function(source, opt_options) {
  *     Updated options.
  */
 FeatureFormat.prototype.adaptOptions = function(options) {
-  return _ol_obj_.assign({
+  return assign({
     dataProjection: this.defaultDataProjection,
     featureProjection: this.defaultFeatureProjection
   }, options);
diff --git a/src/ol/format/GML2.js b/src/ol/format/GML2.js
index 8a23ae76c5..fdd2c452b1 100644
--- a/src/ol/format/GML2.js
+++ b/src/ol/format/GML2.js
@@ -7,7 +7,7 @@ import {transformWithOptions} from '../format/Feature.js';
 import GMLBase from '../format/GMLBase.js';
 import XSD from '../format/XSD.js';
 import Geometry from '../geom/Geometry.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import {get as getProjection, transformExtent} from '../proj.js';
 import _ol_xml_ from '../xml.js';
 
@@ -268,7 +268,7 @@ GML2.prototype.writeFeatureElement = function(node, feature, objectStack) {
       }
     }
   }
-  const item = _ol_obj_.assign({}, context);
+  const item = assign({}, context);
   item.node = node;
   _ol_xml_.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
     (item), context.serializers,
@@ -285,7 +285,7 @@ GML2.prototype.writeFeatureElement = function(node, feature, objectStack) {
  */
 GML2.prototype.writeGeometryElement = function(node, geometry, objectStack) {
   const context = /** @type {olx.format.WriteOptions} */ (objectStack[objectStack.length - 1]);
-  const item = _ol_obj_.assign({}, context);
+  const item = assign({}, context);
   item.node = node;
   let value;
   if (Array.isArray(geometry)) {
diff --git a/src/ol/format/GML3.js b/src/ol/format/GML3.js
index 1f2f88895f..1fc3eb4edf 100644
--- a/src/ol/format/GML3.js
+++ b/src/ol/format/GML3.js
@@ -13,7 +13,7 @@ import LineString from '../geom/LineString.js';
 import MultiLineString from '../geom/MultiLineString.js';
 import MultiPolygon from '../geom/MultiPolygon.js';
 import Polygon from '../geom/Polygon.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import {get as getProjection, transformExtent} from '../proj.js';
 import _ol_xml_ from '../xml.js';
 
@@ -951,7 +951,7 @@ GML3.prototype.writeCurveSegments_ = function(node, line, objectStack) {
  */
 GML3.prototype.writeGeometryElement = function(node, geometry, objectStack) {
   const context = /** @type {olx.format.WriteOptions} */ (objectStack[objectStack.length - 1]);
-  const item = _ol_obj_.assign({}, context);
+  const item = assign({}, context);
   item.node = node;
   let value;
   if (Array.isArray(geometry)) {
@@ -1009,7 +1009,7 @@ GML3.prototype.writeFeatureElement = function(node, feature, objectStack) {
       }
     }
   }
-  const item = _ol_obj_.assign({}, context);
+  const item = assign({}, context);
   item.node = node;
   _ol_xml_.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
     (item), context.serializers,
@@ -1033,7 +1033,7 @@ GML3.prototype.writeFeatureMembers_ = function(node, features, objectStack) {
   serializers[featureNS] = {};
   serializers[featureNS][featureType] = _ol_xml_.makeChildAppender(
     this.writeFeatureElement, this);
-  const item = _ol_obj_.assign({}, context);
+  const item = assign({}, context);
   item.node = node;
   _ol_xml_.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
     (item),
@@ -1206,7 +1206,7 @@ GML3.prototype.writeGeometryNode = function(geometry, opt_options) {
     curve: this.curve_, surface: this.surface_,
     multiSurface: this.multiSurface_, multiCurve: this.multiCurve_};
   if (opt_options) {
-    _ol_obj_.assign(context, opt_options);
+    assign(context, opt_options);
   }
   this.writeGeometryElement(geom, geometry, [context]);
   return geom;
@@ -1251,7 +1251,7 @@ GML3.prototype.writeFeaturesNode = function(features, opt_options) {
     featureType: this.featureType
   };
   if (opt_options) {
-    _ol_obj_.assign(context, opt_options);
+    assign(context, opt_options);
   }
   this.writeFeatureMembers_(node, features, [context]);
   return node;
diff --git a/src/ol/format/GMLBase.js b/src/ol/format/GMLBase.js
index ba99c01cd9..d83087121c 100644
--- a/src/ol/format/GMLBase.js
+++ b/src/ol/format/GMLBase.js
@@ -17,7 +17,7 @@ import MultiPoint from '../geom/MultiPoint.js';
 import MultiPolygon from '../geom/MultiPolygon.js';
 import Point from '../geom/Point.js';
 import Polygon from '../geom/Polygon.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import {get as getProjection} from '../proj.js';
 import _ol_xml_ from '../xml.js';
 
@@ -584,7 +584,7 @@ GMLBase.prototype.readFeaturesFromNode = function(node, opt_options) {
     featureNS: this.featureNS
   };
   if (opt_options) {
-    _ol_obj_.assign(options, this.getReadOptions(node, opt_options));
+    assign(options, this.getReadOptions(node, opt_options));
   }
   const features = this.readFeaturesInternal(node, [options]);
   return features || [];
diff --git a/src/ol/format/GeoJSON.js b/src/ol/format/GeoJSON.js
index 9ed1e7aae6..3e6cabc00d 100644
--- a/src/ol/format/GeoJSON.js
+++ b/src/ol/format/GeoJSON.js
@@ -16,7 +16,7 @@ import MultiPoint from '../geom/MultiPoint.js';
 import MultiPolygon from '../geom/MultiPolygon.js';
 import Point from '../geom/Point.js';
 import Polygon from '../geom/Polygon.js';
-import _ol_obj_ from '../obj.js';
+import {assign, isEmpty} from '../obj.js';
 import {get as getProjection} from '../proj.js';
 
 /**
@@ -216,7 +216,7 @@ function writeEmptyGeometryCollectionGeometry(geometry) {
  */
 function writeGeometryCollectionGeometry(geometry, opt_options) {
   const geometries = geometry.getGeometriesArray().map(function(geometry) {
-    const options = _ol_obj_.assign({}, opt_options);
+    const options = assign({}, opt_options);
     delete options.featureProjection;
     return writeGeometry(geometry, options);
   });
@@ -492,7 +492,7 @@ GeoJSON.prototype.writeFeatureObject = function(feature, opt_options) {
   }
   const properties = feature.getProperties();
   delete properties[feature.getGeometryName()];
-  if (!_ol_obj_.isEmpty(properties)) {
+  if (!isEmpty(properties)) {
     object.properties = properties;
   } else {
     object.properties = null;
diff --git a/src/ol/format/OSMXML.js b/src/ol/format/OSMXML.js
index a26536dbf5..b85d2486d7 100644
--- a/src/ol/format/OSMXML.js
+++ b/src/ol/format/OSMXML.js
@@ -11,7 +11,7 @@ import GeometryLayout from '../geom/GeometryLayout.js';
 import LineString from '../geom/LineString.js';
 import Point from '../geom/Point.js';
 import Polygon from '../geom/Polygon.js';
-import _ol_obj_ from '../obj.js';
+import {isEmpty} from '../obj.js';
 import {get as getProjection} from '../proj.js';
 import _ol_xml_ from '../xml.js';
 
@@ -55,7 +55,7 @@ OSMXML.readNode_ = function(node, objectStack) {
   const values = _ol_xml_.pushParseAndPop({
     tags: {}
   }, OSMXML.NODE_PARSERS_, node, objectStack);
-  if (!_ol_obj_.isEmpty(values.tags)) {
+  if (!isEmpty(values.tags)) {
     const geometry = new Point(coordinates);
     transformWithOptions(geometry, false, options);
     const feature = new Feature(geometry);
diff --git a/src/ol/format/WFS.js b/src/ol/format/WFS.js
index 724a51917d..a423f27e2d 100644
--- a/src/ol/format/WFS.js
+++ b/src/ol/format/WFS.js
@@ -10,7 +10,7 @@ import _ol_format_filter_ from '../format/filter.js';
 import XMLFeature from '../format/XMLFeature.js';
 import XSD from '../format/XSD.js';
 import Geometry from '../geom/Geometry.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import {get as getProjection} from '../proj.js';
 import _ol_xml_ from '../xml.js';
 
@@ -153,8 +153,7 @@ WFS.prototype.readFeaturesFromNode = function(node, opt_options) {
     'featureType': this.featureType_,
     'featureNS': this.featureNS_
   });
-  _ol_obj_.assign(context, this.getReadOptions(node,
-    opt_options ? opt_options : {}));
+  assign(context, this.getReadOptions(node, opt_options ? opt_options : {}));
   const objectStack = [context];
   this.gmlFormat_.FEATURE_COLLECTION_PARSERS[GMLBase.GMLNS][
     'featureMember'] =
@@ -599,7 +598,7 @@ WFS.writeQuery_ = function(node, featureType, objectStack) {
     _ol_xml_.setAttributeNS(node, WFS.XMLNS, 'xmlns:' + featurePrefix,
       featureNS);
   }
-  const item = /** @type {ol.XmlNodeStackItem} */ (_ol_obj_.assign({}, context));
+  const item = /** @type {ol.XmlNodeStackItem} */ (assign({}, context));
   item.node = node;
   _ol_xml_.pushSerializeAndPop(item,
     WFS.QUERY_SERIALIZERS_,
@@ -916,7 +915,7 @@ WFS.writeFilter = function(filter) {
  */
 WFS.writeGetFeature_ = function(node, featureTypes, objectStack) {
   const context = /** @type {Object} */ (objectStack[objectStack.length - 1]);
-  const item = /** @type {ol.XmlNodeStackItem} */ (_ol_obj_.assign({}, context));
+  const item = /** @type {ol.XmlNodeStackItem} */ (assign({}, context));
   item.node = node;
   _ol_xml_.pushSerializeAndPop(item,
     WFS.GETFEATURE_SERIALIZERS_,
@@ -1025,7 +1024,7 @@ WFS.prototype.writeTransaction = function(inserts, updates, deletes,
     obj = {node: node, 'featureNS': options.featureNS,
       'featureType': options.featureType, 'featurePrefix': featurePrefix,
       'gmlVersion': gmlVersion, 'hasZ': options.hasZ, 'srsName': options.srsName};
-    _ol_obj_.assign(obj, baseObj);
+    assign(obj, baseObj);
     _ol_xml_.pushSerializeAndPop(obj,
       WFS.TRANSACTION_SERIALIZERS_,
       _ol_xml_.makeSimpleNodeFactory('Insert'), inserts,
@@ -1035,7 +1034,7 @@ WFS.prototype.writeTransaction = function(inserts, updates, deletes,
     obj = {node: node, 'featureNS': options.featureNS,
       'featureType': options.featureType, 'featurePrefix': featurePrefix,
       'gmlVersion': gmlVersion, 'hasZ': options.hasZ, 'srsName': options.srsName};
-    _ol_obj_.assign(obj, baseObj);
+    assign(obj, baseObj);
     _ol_xml_.pushSerializeAndPop(obj,
       WFS.TRANSACTION_SERIALIZERS_,
       _ol_xml_.makeSimpleNodeFactory('Update'), updates,
diff --git a/src/ol/format/WMSGetFeatureInfo.js b/src/ol/format/WMSGetFeatureInfo.js
index 72502cdf86..dc91a2e4ed 100644
--- a/src/ol/format/WMSGetFeatureInfo.js
+++ b/src/ol/format/WMSGetFeatureInfo.js
@@ -5,7 +5,7 @@ import {inherits} from '../index.js';
 import {extend, includes} from '../array.js';
 import GML2 from '../format/GML2.js';
 import XMLFeature from '../format/XMLFeature.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import _ol_xml_ from '../xml.js';
 
 /**
@@ -158,7 +158,7 @@ WMSGetFeatureInfo.prototype.readFeatures;
 WMSGetFeatureInfo.prototype.readFeaturesFromNode = function(node, opt_options) {
   const options = {};
   if (opt_options) {
-    _ol_obj_.assign(options, this.getReadOptions(node, opt_options));
+    assign(options, this.getReadOptions(node, opt_options));
   }
   return this.readFeatures_(node, [options]);
 };
diff --git a/src/ol/geom/GeometryCollection.js b/src/ol/geom/GeometryCollection.js
index 664714cfb3..4294fda6df 100644
--- a/src/ol/geom/GeometryCollection.js
+++ b/src/ol/geom/GeometryCollection.js
@@ -7,7 +7,7 @@ import EventType from '../events/EventType.js';
 import {createOrUpdateEmpty, closestSquaredDistanceXY, extend, getCenter} from '../extent.js';
 import Geometry from '../geom/Geometry.js';
 import GeometryType from '../geom/GeometryType.js';
-import _ol_obj_ from '../obj.js';
+import {clear} from '../obj.js';
 
 /**
  * @classdesc
@@ -162,7 +162,7 @@ GeometryCollection.prototype.getGeometriesArray = function() {
  */
 GeometryCollection.prototype.getSimplifiedGeometry = function(squaredTolerance) {
   if (this.simplifiedGeometryRevision != this.getRevision()) {
-    _ol_obj_.clear(this.simplifiedGeometryCache);
+    clear(this.simplifiedGeometryCache);
     this.simplifiedGeometryMaxMinSquaredTolerance = 0;
     this.simplifiedGeometryRevision = this.getRevision();
   }
diff --git a/src/ol/geom/SimpleGeometry.js b/src/ol/geom/SimpleGeometry.js
index 3ab9b421d1..409f490597 100644
--- a/src/ol/geom/SimpleGeometry.js
+++ b/src/ol/geom/SimpleGeometry.js
@@ -7,7 +7,7 @@ import {createOrUpdateFromFlatCoordinates, getCenter} from '../extent.js';
 import Geometry from '../geom/Geometry.js';
 import GeometryLayout from '../geom/GeometryLayout.js';
 import _ol_geom_flat_transform_ from '../geom/flat/transform.js';
-import _ol_obj_ from '../obj.js';
+import {clear} from '../obj.js';
 
 /**
  * @classdesc
@@ -145,7 +145,7 @@ SimpleGeometry.prototype.getLayout = function() {
  */
 SimpleGeometry.prototype.getSimplifiedGeometry = function(squaredTolerance) {
   if (this.simplifiedGeometryRevision != this.getRevision()) {
-    _ol_obj_.clear(this.simplifiedGeometryCache);
+    clear(this.simplifiedGeometryCache);
     this.simplifiedGeometryMaxMinSquaredTolerance = 0;
     this.simplifiedGeometryRevision = this.getRevision();
   }
diff --git a/src/ol/interaction/Pointer.js b/src/ol/interaction/Pointer.js
index 93e3abf9ac..fb242c681c 100644
--- a/src/ol/interaction/Pointer.js
+++ b/src/ol/interaction/Pointer.js
@@ -6,7 +6,7 @@ import {FALSE} from '../functions.js';
 import MapBrowserEventType from '../MapBrowserEventType.js';
 import MapBrowserPointerEvent from '../MapBrowserPointerEvent.js';
 import Interaction from '../interaction/Interaction.js';
-import _ol_obj_ from '../obj.js';
+import {getValues} from '../obj.js';
 
 /**
  * @classdesc
@@ -133,7 +133,7 @@ PointerInteraction.prototype.updateTrackedPointers_ = function(mapBrowserEvent)
       // update only when there was a pointerdown event for this pointer
       this.trackedPointers_[id] = event;
     }
-    this.targetPointers = _ol_obj_.getValues(this.trackedPointers_);
+    this.targetPointers = getValues(this.trackedPointers_);
   }
 };
 
diff --git a/src/ol/interaction/Select.js b/src/ol/interaction/Select.js
index 041283a962..84c21ad51f 100644
--- a/src/ol/interaction/Select.js
+++ b/src/ol/interaction/Select.js
@@ -11,7 +11,7 @@ import {TRUE} from '../functions.js';
 import GeometryType from '../geom/GeometryType.js';
 import Interaction from '../interaction/Interaction.js';
 import VectorLayer from '../layer/Vector.js';
-import _ol_obj_ from '../obj.js';
+import {clear} from '../obj.js';
 import VectorSource from '../source/Vector.js';
 import Style from '../style/Style.js';
 
@@ -215,7 +215,7 @@ Select.handleEvent = function(mapBrowserEvent) {
     // Replace the currently selected feature(s) with the feature(s) at the
     // pixel, or clear the selected feature(s) if there is no feature at
     // the pixel.
-    _ol_obj_.clear(this.featureLayerAssociation_);
+    clear(this.featureLayerAssociation_);
     map.forEachFeatureAtPixel(mapBrowserEvent.pixel,
       (
       /**
diff --git a/src/ol/interaction/Snap.js b/src/ol/interaction/Snap.js
index aafdca67ae..e098282829 100644
--- a/src/ol/interaction/Snap.js
+++ b/src/ol/interaction/Snap.js
@@ -12,7 +12,7 @@ import {TRUE, FALSE} from '../functions.js';
 import GeometryType from '../geom/GeometryType.js';
 import {fromCircle} from '../geom/Polygon.js';
 import PointerInteraction from '../interaction/Pointer.js';
-import _ol_obj_ from '../obj.js';
+import {getValues} from '../obj.js';
 import VectorSource from '../source/Vector.js';
 import VectorEventType from '../source/VectorEventType.js';
 import RBush from '../structs/RBush.js';
@@ -611,7 +611,7 @@ Snap.handleEvent_ = function(evt) {
  * @private
  */
 Snap.handleUpEvent_ = function(evt) {
-  const featuresToUpdate = _ol_obj_.getValues(this.pendingFeatures_);
+  const featuresToUpdate = getValues(this.pendingFeatures_);
   if (featuresToUpdate.length) {
     featuresToUpdate.forEach(this.updateFeature_.bind(this));
     this.pendingFeatures_ = {};
diff --git a/src/ol/layer/Base.js b/src/ol/layer/Base.js
index 1879cd3952..e0368f0991 100644
--- a/src/ol/layer/Base.js
+++ b/src/ol/layer/Base.js
@@ -5,7 +5,7 @@ import {inherits} from '../index.js';
 import BaseObject from '../Object.js';
 import LayerProperty from '../layer/Property.js';
 import {clamp} from '../math.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 
 /**
  * @classdesc
@@ -28,7 +28,7 @@ const BaseLayer = function(options) {
   /**
    * @type {Object.<string, *>}
    */
-  const properties = _ol_obj_.assign({}, options);
+  const properties = assign({}, options);
   properties[LayerProperty.OPACITY] =
       options.opacity !== undefined ? options.opacity : 1;
   properties[LayerProperty.VISIBLE] =
diff --git a/src/ol/layer/Group.js b/src/ol/layer/Group.js
index 3711d554d7..32292d0f17 100644
--- a/src/ol/layer/Group.js
+++ b/src/ol/layer/Group.js
@@ -11,7 +11,7 @@ import _ol_events_ from '../events.js';
 import EventType from '../events/EventType.js';
 import {getIntersection} from '../extent.js';
 import BaseLayer from '../layer/Base.js';
-import _ol_obj_ from '../obj.js';
+import {assign, clear} from '../obj.js';
 import SourceState from '../source/State.js';
 
 
@@ -38,8 +38,7 @@ const Property = {
 const LayerGroup = function(opt_options) {
 
   const options = opt_options || {};
-  const baseOptions = /** @type {olx.layer.GroupOptions} */
-      (_ol_obj_.assign({}, options));
+  const baseOptions = /** @type {olx.layer.GroupOptions} */ (assign({}, options));
   delete baseOptions.layers;
 
   let layers = options.layers;
@@ -107,7 +106,7 @@ LayerGroup.prototype.handleLayersChanged_ = function(event) {
   for (const id in this.listenerKeys_) {
     this.listenerKeys_[id].forEach(_ol_events_.unlistenByKey);
   }
-  _ol_obj_.clear(this.listenerKeys_);
+  clear(this.listenerKeys_);
 
   const layersArray = layers.getArray();
   let i, ii, layer;
diff --git a/src/ol/layer/Heatmap.js b/src/ol/layer/Heatmap.js
index 0972668981..0a4e691f39 100644
--- a/src/ol/layer/Heatmap.js
+++ b/src/ol/layer/Heatmap.js
@@ -7,7 +7,7 @@ import BaseObject from '../Object.js';
 import {createCanvasContext2D} from '../dom.js';
 import VectorLayer from '../layer/Vector.js';
 import {clamp} from '../math.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import RenderEventType from '../render/EventType.js';
 import Icon from '../style/Icon.js';
 import Style from '../style/Style.js';
@@ -47,7 +47,7 @@ const DEFAULT_GRADIENT = ['#00f', '#0ff', '#0f0', '#ff0', '#f00'];
 const Heatmap = function(opt_options) {
   const options = opt_options ? opt_options : {};
 
-  const baseOptions = _ol_obj_.assign({}, options);
+  const baseOptions = assign({}, options);
 
   delete baseOptions.gradient;
   delete baseOptions.radius;
diff --git a/src/ol/layer/Layer.js b/src/ol/layer/Layer.js
index db938ed941..7ce757d145 100644
--- a/src/ol/layer/Layer.js
+++ b/src/ol/layer/Layer.js
@@ -7,7 +7,7 @@ import {getUid, inherits} from '../index.js';
 import BaseObject from '../Object.js';
 import BaseLayer from '../layer/Base.js';
 import LayerProperty from '../layer/Property.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import RenderEventType from '../render/EventType.js';
 import SourceState from '../source/State.js';
 
@@ -35,7 +35,7 @@ import SourceState from '../source/State.js';
  */
 const Layer = function(options) {
 
-  const baseOptions = _ol_obj_.assign({}, options);
+  const baseOptions = assign({}, options);
   delete baseOptions.source;
 
   BaseLayer.call(this, /** @type {olx.layer.BaseOptions} */ (baseOptions));
diff --git a/src/ol/layer/Tile.js b/src/ol/layer/Tile.js
index 1ff1a4860f..952b112f11 100644
--- a/src/ol/layer/Tile.js
+++ b/src/ol/layer/Tile.js
@@ -5,7 +5,7 @@ import {inherits} from '../index.js';
 import LayerType from '../LayerType.js';
 import Layer from '../layer/Layer.js';
 import _ol_layer_TileProperty_ from '../layer/TileProperty.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 
 /**
  * @classdesc
@@ -24,7 +24,7 @@ import _ol_obj_ from '../obj.js';
 const TileLayer = function(opt_options) {
   const options = opt_options ? opt_options : {};
 
-  const baseOptions = _ol_obj_.assign({}, options);
+  const baseOptions = assign({}, options);
 
   delete baseOptions.preload;
   delete baseOptions.useInterimTilesOnError;
diff --git a/src/ol/layer/Vector.js b/src/ol/layer/Vector.js
index cd3febfd96..e5f379c0bf 100644
--- a/src/ol/layer/Vector.js
+++ b/src/ol/layer/Vector.js
@@ -5,7 +5,7 @@ import {inherits} from '../index.js';
 import LayerType from '../LayerType.js';
 import Layer from '../layer/Layer.js';
 import _ol_layer_VectorRenderType_ from '../layer/VectorRenderType.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import Style from '../style/Style.js';
 
 
@@ -35,7 +35,7 @@ const VectorLayer = function(opt_options) {
   const options = opt_options ?
     opt_options : /** @type {olx.layer.VectorOptions} */ ({});
 
-  const baseOptions = _ol_obj_.assign({}, options);
+  const baseOptions = assign({}, options);
 
   delete baseOptions.style;
   delete baseOptions.renderBuffer;
diff --git a/src/ol/layer/VectorTile.js b/src/ol/layer/VectorTile.js
index 44a4b28c81..dd03debdb9 100644
--- a/src/ol/layer/VectorTile.js
+++ b/src/ol/layer/VectorTile.js
@@ -7,7 +7,7 @@ import {assert} from '../asserts.js';
 import _ol_layer_TileProperty_ from '../layer/TileProperty.js';
 import VectorLayer from '../layer/Vector.js';
 import _ol_layer_VectorTileRenderType_ from '../layer/VectorTileRenderType.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 
 /**
  * @classdesc
@@ -35,7 +35,7 @@ const VectorTileLayer = function(opt_options) {
   }
   options.renderMode = renderMode;
 
-  const baseOptions = _ol_obj_.assign({}, options);
+  const baseOptions = assign({}, options);
 
   delete baseOptions.preload;
   delete baseOptions.useInterimTilesOnError;
diff --git a/src/ol/obj.js b/src/ol/obj.js
index 2b5c0ec970..ef6ecf3fcf 100644
--- a/src/ol/obj.js
+++ b/src/ol/obj.js
@@ -1,7 +1,6 @@
 /**
  * @module ol/obj
  */
-const _ol_obj_ = {};
 
 
 /**
@@ -13,7 +12,7 @@ const _ol_obj_ = {};
  * @param {...Object} var_sources The source object(s).
  * @return {!Object} The modified target object.
  */
-_ol_obj_.assign = (typeof Object.assign === 'function') ? Object.assign : function(target, var_sources) {
+export const assign = (typeof Object.assign === 'function') ? Object.assign : function(target, var_sources) {
   if (target === undefined || target === null) {
     throw new TypeError('Cannot convert undefined or null to object');
   }
@@ -37,11 +36,11 @@ _ol_obj_.assign = (typeof Object.assign === 'function') ? Object.assign : functi
  * Removes all properties from an object.
  * @param {Object} object The object to clear.
  */
-_ol_obj_.clear = function(object) {
+export function clear(object) {
   for (const property in object) {
     delete object[property];
   }
-};
+}
 
 
 /**
@@ -50,13 +49,13 @@ _ol_obj_.clear = function(object) {
  * @return {!Array<V>} The property values.
  * @template K,V
  */
-_ol_obj_.getValues = function(object) {
+export function getValues(object) {
   const values = [];
   for (const property in object) {
     values.push(object[property]);
   }
   return values;
-};
+}
 
 
 /**
@@ -64,11 +63,10 @@ _ol_obj_.getValues = function(object) {
  * @param {Object} object The object to check.
  * @return {boolean} The object is empty.
  */
-_ol_obj_.isEmpty = function(object) {
+export function isEmpty(object) {
   let property;
   for (property in object) {
     return false;
   }
   return !property;
-};
-export default _ol_obj_;
+}
diff --git a/src/ol/proj/transforms.js b/src/ol/proj/transforms.js
index 8815d151f3..6d3536fd11 100644
--- a/src/ol/proj/transforms.js
+++ b/src/ol/proj/transforms.js
@@ -1,7 +1,7 @@
 /**
  * @module ol/proj/transforms
  */
-import _ol_obj_ from '../obj.js';
+import {isEmpty} from '../obj.js';
 
 
 /**
@@ -51,7 +51,7 @@ export function remove(source, destination) {
   const destinationCode = destination.getCode();
   const transform = transforms[sourceCode][destinationCode];
   delete transforms[sourceCode][destinationCode];
-  if (_ol_obj_.isEmpty(transforms[sourceCode])) {
+  if (isEmpty(transforms[sourceCode])) {
     delete transforms[sourceCode];
   }
   return transform;
diff --git a/src/ol/render/canvas.js b/src/ol/render/canvas.js
index 9c8f8d8154..cf62150e1c 100644
--- a/src/ol/render/canvas.js
+++ b/src/ol/render/canvas.js
@@ -3,7 +3,7 @@
  */
 import {getFontFamilies} from '../css.js';
 import {createCanvasContext2D} from '../dom.js';
-import _ol_obj_ from '../obj.js';
+import {clear} from '../obj.js';
 import LRUCache from '../structs/LRUCache.js';
 import _ol_transform_ from '../transform.js';
 const _ol_render_canvas_ = {};
@@ -155,7 +155,7 @@ _ol_render_canvas_.checkFont = (function() {
       if (checked[font] < retries) {
         if (isAvailable(font)) {
           checked[font] = retries;
-          _ol_obj_.clear(_ol_render_canvas_.textHeights_);
+          clear(_ol_render_canvas_.textHeights_);
           // Make sure that loaded fonts are picked up by Safari
           _ol_render_canvas_.measureContext_ = null;
           labelCache.clear();
diff --git a/src/ol/render/canvas/Replay.js b/src/ol/render/canvas/Replay.js
index 113d88ae07..e3f5c90dfd 100644
--- a/src/ol/render/canvas/Replay.js
+++ b/src/ol/render/canvas/Replay.js
@@ -13,7 +13,7 @@ import _ol_geom_flat_length_ from '../../geom/flat/length.js';
 import _ol_geom_flat_textpath_ from '../../geom/flat/textpath.js';
 import _ol_geom_flat_transform_ from '../../geom/flat/transform.js';
 import _ol_has_ from '../../has.js';
-import _ol_obj_ from '../../obj.js';
+import {isEmpty} from '../../obj.js';
 import VectorContext from '../VectorContext.js';
 import _ol_render_canvas_ from '../canvas.js';
 import _ol_render_canvas_Instruction_ from '../canvas/Instruction.js';
@@ -556,7 +556,7 @@ CanvasReplay.prototype.replay_ = function(
       transform, this.pixelCoordinates_);
     _ol_transform_.setFromArray(this.renderedTransform_, transform);
   }
-  const skipFeatures = !_ol_obj_.isEmpty(skippedFeaturesHash);
+  const skipFeatures = !isEmpty(skippedFeaturesHash);
   let i = 0; // instruction index
   const ii = instructions.length; // end of instructions
   let d = 0; // data index
diff --git a/src/ol/render/canvas/ReplayGroup.js b/src/ol/render/canvas/ReplayGroup.js
index 6f5c085620..73d3613484 100644
--- a/src/ol/render/canvas/ReplayGroup.js
+++ b/src/ol/render/canvas/ReplayGroup.js
@@ -6,7 +6,7 @@ import {numberSafeCompareFunction} from '../../array.js';
 import {createCanvasContext2D} from '../../dom.js';
 import {buffer, createEmpty, extendCoordinate} from '../../extent.js';
 import _ol_geom_flat_transform_ from '../../geom/flat/transform.js';
-import _ol_obj_ from '../../obj.js';
+import {isEmpty} from '../../obj.js';
 import ReplayGroup from '../ReplayGroup.js';
 import ReplayType from '../ReplayType.js';
 import CanvasReplay from '../canvas/Replay.js';
@@ -434,7 +434,7 @@ CanvasReplayGroup.prototype.getReplays = function() {
  * @inheritDoc
  */
 CanvasReplayGroup.prototype.isEmpty = function() {
-  return _ol_obj_.isEmpty(this.replaysByZIndex_);
+  return isEmpty(this.replaysByZIndex_);
 };
 
 
diff --git a/src/ol/render/webgl/CircleReplay.js b/src/ol/render/webgl/CircleReplay.js
index 05f0d75590..49b194b54a 100644
--- a/src/ol/render/webgl/CircleReplay.js
+++ b/src/ol/render/webgl/CircleReplay.js
@@ -5,7 +5,7 @@ import {getUid, inherits} from '../../index.js';
 import {equals} from '../../array.js';
 import {asArray} from '../../color.js';
 import {intersects} from '../../extent.js';
-import _ol_obj_ from '../../obj.js';
+import {isEmpty} from '../../obj.js';
 import _ol_geom_flat_transform_ from '../../geom/flat/transform.js';
 import _ol_render_webgl_circlereplay_defaultshader_ from '../webgl/circlereplay/defaultshader.js';
 import _ol_render_webgl_circlereplay_defaultshader_Locations_ from '../webgl/circlereplay/defaultshader/Locations.js';
@@ -246,7 +246,7 @@ WebGLCircleReplay.prototype.shutDownProgram = function(gl, locations) {
  * @inheritDoc
  */
 WebGLCircleReplay.prototype.drawReplay = function(gl, context, skippedFeaturesHash, hitDetection) {
-  if (!_ol_obj_.isEmpty(skippedFeaturesHash)) {
+  if (!isEmpty(skippedFeaturesHash)) {
     this.drawReplaySkipping_(gl, context, skippedFeaturesHash);
   } else {
     //Draw by style groups to minimize drawElements() calls.
diff --git a/src/ol/render/webgl/LineStringReplay.js b/src/ol/render/webgl/LineStringReplay.js
index cba35d6684..e0d2dbabd7 100644
--- a/src/ol/render/webgl/LineStringReplay.js
+++ b/src/ol/render/webgl/LineStringReplay.js
@@ -8,7 +8,7 @@ import {intersects} from '../../extent.js';
 import _ol_geom_flat_orient_ from '../../geom/flat/orient.js';
 import _ol_geom_flat_transform_ from '../../geom/flat/transform.js';
 import _ol_geom_flat_topology_ from '../../geom/flat/topology.js';
-import _ol_obj_ from '../../obj.js';
+import {isEmpty} from '../../obj.js';
 import _ol_render_webgl_ from '../webgl.js';
 import WebGLReplay from '../webgl/Replay.js';
 import _ol_render_webgl_linestringreplay_defaultshader_ from '../webgl/linestringreplay/defaultshader.js';
@@ -506,7 +506,7 @@ WebGLLineStringReplay.prototype.drawReplay = function(gl, context, skippedFeatur
     gl.depthFunc(gl.NOTEQUAL);
   }
 
-  if (!_ol_obj_.isEmpty(skippedFeaturesHash)) {
+  if (!isEmpty(skippedFeaturesHash)) {
     this.drawReplaySkipping_(gl, context, skippedFeaturesHash);
   } else {
     //Draw by style groups to minimize drawElements() calls.
diff --git a/src/ol/render/webgl/PolygonReplay.js b/src/ol/render/webgl/PolygonReplay.js
index 9cbe834e86..d127a26673 100644
--- a/src/ol/render/webgl/PolygonReplay.js
+++ b/src/ol/render/webgl/PolygonReplay.js
@@ -5,7 +5,7 @@ import {getUid, inherits} from '../../index.js';
 import {equals} from '../../array.js';
 import {asArray} from '../../color.js';
 import {intersects} from '../../extent.js';
-import _ol_obj_ from '../../obj.js';
+import {isEmpty} from '../../obj.js';
 import _ol_geom_flat_contains_ from '../../geom/flat/contains.js';
 import _ol_geom_flat_orient_ from '../../geom/flat/orient.js';
 import _ol_geom_flat_transform_ from '../../geom/flat/transform.js';
@@ -924,7 +924,7 @@ WebGLPolygonReplay.prototype.drawReplay = function(gl, context, skippedFeaturesH
     gl.depthFunc(gl.NOTEQUAL);
   }
 
-  if (!_ol_obj_.isEmpty(skippedFeaturesHash)) {
+  if (!isEmpty(skippedFeaturesHash)) {
     this.drawReplaySkipping_(gl, context, skippedFeaturesHash);
   } else {
     //Draw by style groups to minimize drawElements() calls.
diff --git a/src/ol/render/webgl/ReplayGroup.js b/src/ol/render/webgl/ReplayGroup.js
index 4e04289346..db0c78a5f2 100644
--- a/src/ol/render/webgl/ReplayGroup.js
+++ b/src/ol/render/webgl/ReplayGroup.js
@@ -4,7 +4,7 @@
 import {inherits} from '../../index.js';
 import {numberSafeCompareFunction} from '../../array.js';
 import {buffer, createOrUpdateFromCoordinate} from '../../extent.js';
-import _ol_obj_ from '../../obj.js';
+import {isEmpty} from '../../obj.js';
 import _ol_render_replay_ from '../replay.js';
 import ReplayGroup from '../ReplayGroup.js';
 import WebGLCircleReplay from '../webgl/CircleReplay.js';
@@ -127,7 +127,7 @@ WebGLReplayGroup.prototype.getReplay = function(zIndex, replayType) {
  * @inheritDoc
  */
 WebGLReplayGroup.prototype.isEmpty = function() {
-  return _ol_obj_.isEmpty(this.replaysByZIndex_);
+  return isEmpty(this.replaysByZIndex_);
 };
 
 
diff --git a/src/ol/render/webgl/TextureReplay.js b/src/ol/render/webgl/TextureReplay.js
index 6efc3e9ae4..7035c785a1 100644
--- a/src/ol/render/webgl/TextureReplay.js
+++ b/src/ol/render/webgl/TextureReplay.js
@@ -3,7 +3,7 @@
  */
 import {getUid, inherits} from '../../index.js';
 import {intersects} from '../../extent.js';
-import _ol_obj_ from '../../obj.js';
+import {isEmpty} from '../../obj.js';
 import _ol_render_webgl_texturereplay_defaultshader_ from '../webgl/texturereplay/defaultshader.js';
 import _ol_render_webgl_texturereplay_defaultshader_Locations_ from '../webgl/texturereplay/defaultshader/Locations.js';
 import WebGLReplay from '../webgl/Replay.js';
@@ -331,9 +331,8 @@ WebGLTextureReplay.prototype.drawReplay = function(gl, context, skippedFeaturesH
   const textures = hitDetection ? this.getHitDetectionTextures() : this.getTextures();
   const groupIndices = hitDetection ? this.hitDetectionGroupIndices : this.groupIndices;
 
-  if (!_ol_obj_.isEmpty(skippedFeaturesHash)) {
-    this.drawReplaySkipping(
-      gl, context, skippedFeaturesHash, textures, groupIndices);
+  if (!isEmpty(skippedFeaturesHash)) {
+    this.drawReplaySkipping(gl, context, skippedFeaturesHash, textures, groupIndices);
   } else {
     let i, ii, start;
     for (i = 0, ii = textures.length, start = 0; i < ii; ++i) {
diff --git a/src/ol/renderer/canvas/ImageLayer.js b/src/ol/renderer/canvas/ImageLayer.js
index 3a5f3b18da..baba5a0f12 100644
--- a/src/ol/renderer/canvas/ImageLayer.js
+++ b/src/ol/renderer/canvas/ImageLayer.js
@@ -9,7 +9,7 @@ import ViewHint from '../../ViewHint.js';
 import {equals} from '../../array.js';
 import {getHeight, getIntersection, getWidth, isEmpty} from '../../extent.js';
 import _ol_layer_VectorRenderType_ from '../../layer/VectorRenderType.js';
-import _ol_obj_ from '../../obj.js';
+import {assign} from '../../obj.js';
 import {getLayerRendererPlugins} from '../../plugins.js';
 import RendererType from '../Type.js';
 import IntermediateCanvasRenderer from '../canvas/IntermediateCanvas.js';
@@ -137,12 +137,12 @@ CanvasImageLayerRenderer.prototype.prepareFrame = function(frameState, layerStat
     const vectorRenderer = this.vectorRenderer_;
     if (vectorRenderer) {
       const context = vectorRenderer.context;
-      const imageFrameState = /** @type {olx.FrameState} */ (_ol_obj_.assign({}, frameState, {
+      const imageFrameState = /** @type {olx.FrameState} */ (assign({}, frameState, {
         size: [
           getWidth(renderedExtent) / viewResolution,
           getHeight(renderedExtent) / viewResolution
         ],
-        viewState: /** @type {olx.ViewState} */ (_ol_obj_.assign({}, frameState.viewState, {
+        viewState: /** @type {olx.ViewState} */ (assign({}, frameState.viewState, {
           rotation: 0
         }))
       }));
diff --git a/src/ol/source/CartoDB.js b/src/ol/source/CartoDB.js
index a0eb0c1fe0..a262b79539 100644
--- a/src/ol/source/CartoDB.js
+++ b/src/ol/source/CartoDB.js
@@ -2,7 +2,7 @@
  * @module ol/source/CartoDB
  */
 import {inherits} from '../index.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import SourceState from '../source/State.js';
 import XYZ from '../source/XYZ.js';
 
@@ -74,7 +74,7 @@ CartoDB.prototype.getConfig = function() {
  * @api
  */
 CartoDB.prototype.updateConfig = function(config) {
-  _ol_obj_.assign(this.config_, config);
+  assign(this.config_, config);
   this.initializeMap_();
 };
 
diff --git a/src/ol/source/ImageArcGISRest.js b/src/ol/source/ImageArcGISRest.js
index db617cb67e..c805bf79ea 100644
--- a/src/ol/source/ImageArcGISRest.js
+++ b/src/ol/source/ImageArcGISRest.js
@@ -7,7 +7,7 @@ import {assert} from '../asserts.js';
 import _ol_events_ from '../events.js';
 import EventType from '../events/EventType.js';
 import {containsExtent, getHeight, getWidth} from '../extent.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import ImageSource from '../source/Image.js';
 import {appendParams} from '../uri.js';
 
@@ -136,7 +136,7 @@ ImageArcGISRest.prototype.getImageInternal = function(extent, resolution, pixelR
     'FORMAT': 'PNG32',
     'TRANSPARENT': true
   };
-  _ol_obj_.assign(params, this.params_);
+  assign(params, this.params_);
 
   extent = extent.slice();
   const centerX = (extent[0] + extent[2]) / 2;
@@ -264,7 +264,7 @@ ImageArcGISRest.prototype.setUrl = function(url) {
  * @api
  */
 ImageArcGISRest.prototype.updateParams = function(params) {
-  _ol_obj_.assign(this.params_, params);
+  assign(this.params_, params);
   this.image_ = null;
   this.changed();
 };
diff --git a/src/ol/source/ImageMapGuide.js b/src/ol/source/ImageMapGuide.js
index 4b128ef038..87ea2df91c 100644
--- a/src/ol/source/ImageMapGuide.js
+++ b/src/ol/source/ImageMapGuide.js
@@ -6,7 +6,7 @@ import _ol_Image_ from '../Image.js';
 import _ol_events_ from '../events.js';
 import EventType from '../events/EventType.js';
 import {containsExtent, getCenter, getHeight, getWidth, scaleFromCenter} from '../extent.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import ImageSource from '../source/Image.js';
 import {appendParams} from '../uri.js';
 
@@ -193,7 +193,7 @@ ImageMapGuide.getScale = function(extent, size, metersPerUnit, dpi) {
  * @api
  */
 ImageMapGuide.prototype.updateParams = function(params) {
-  _ol_obj_.assign(this.params_, params);
+  assign(this.params_, params);
   this.changed();
 };
 
@@ -223,7 +223,7 @@ ImageMapGuide.prototype.getUrl = function(baseUrl, params, extent, size, project
     'SETVIEWCENTERX': center[0],
     'SETVIEWCENTERY': center[1]
   };
-  _ol_obj_.assign(baseParams, params);
+  assign(baseParams, params);
   return appendParams(baseUrl, baseParams);
 };
 
diff --git a/src/ol/source/ImageWMS.js b/src/ol/source/ImageWMS.js
index 4db630d0a2..8529267284 100644
--- a/src/ol/source/ImageWMS.js
+++ b/src/ol/source/ImageWMS.js
@@ -9,7 +9,7 @@ import {assert} from '../asserts.js';
 import _ol_events_ from '../events.js';
 import EventType from '../events/EventType.js';
 import {containsExtent, getCenter, getForViewAndSize, getHeight, getWidth} from '../extent.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import {get as getProjection, transform} from '../proj.js';
 import _ol_reproj_ from '../reproj.js';
 import ImageSource from '../source/Image.js';
@@ -156,7 +156,7 @@ ImageWMS.prototype.getGetFeatureInfoUrl = function(coordinate, resolution, proje
     'TRANSPARENT': true,
     'QUERY_LAYERS': this.params_['LAYERS']
   };
-  _ol_obj_.assign(baseParams, this.params_, params);
+  assign(baseParams, this.params_, params);
 
   const x = Math.floor((coordinate[0] - extent[0]) / resolution);
   const y = Math.floor((extent[3] - coordinate[1]) / resolution);
@@ -223,7 +223,7 @@ ImageWMS.prototype.getImageInternal = function(extent, resolution, pixelRatio, p
     'FORMAT': 'image/png',
     'TRANSPARENT': true
   };
-  _ol_obj_.assign(params, this.params_);
+  assign(params, this.params_);
 
   this.imageSize_[0] = Math.round(getWidth(requestExtent) / imageResolution);
   this.imageSize_[1] = Math.round(getHeight(requestExtent) / imageResolution);
@@ -355,7 +355,7 @@ ImageWMS.prototype.setUrl = function(url) {
  * @api
  */
 ImageWMS.prototype.updateParams = function(params) {
-  _ol_obj_.assign(this.params_, params);
+  assign(this.params_, params);
   this.updateV13_();
   this.image_ = null;
   this.changed();
diff --git a/src/ol/source/Raster.js b/src/ol/source/Raster.js
index 79dc011807..ee81b6f835 100644
--- a/src/ol/source/Raster.js
+++ b/src/ol/source/Raster.js
@@ -12,7 +12,7 @@ import {Processor} from 'pixelworks';
 import {equals, getCenter, getHeight, getWidth} from '../extent.js';
 import ImageLayer from '../layer/Image.js';
 import TileLayer from '../layer/Tile.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import CanvasImageLayerRenderer from '../renderer/canvas/ImageLayer.js';
 import CanvasTileLayerRenderer from '../renderer/canvas/TileLayer.js';
 import ImageSource from '../source/Image.js';
@@ -189,11 +189,9 @@ RasterSource.prototype.setOperation = function(operation, opt_lib) {
  */
 RasterSource.prototype.updateFrameState_ = function(extent, resolution, projection) {
 
-  const frameState = /** @type {olx.FrameState} */ (
-    _ol_obj_.assign({}, this.frameState_));
+  const frameState = /** @type {olx.FrameState} */ (assign({}, this.frameState_));
 
-  frameState.viewState = /** @type {olx.ViewState} */ (
-    _ol_obj_.assign({}, frameState.viewState));
+  frameState.viewState = /** @type {olx.ViewState} */ (assign({}, frameState.viewState));
 
   const center = getCenter(extent);
 
diff --git a/src/ol/source/TileArcGISRest.js b/src/ol/source/TileArcGISRest.js
index e1f196d0af..e4efff9e8e 100644
--- a/src/ol/source/TileArcGISRest.js
+++ b/src/ol/source/TileArcGISRest.js
@@ -4,7 +4,7 @@
 import {inherits} from '../index.js';
 import {createEmpty} from '../extent.js';
 import {modulo} from '../math.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import _ol_size_ from '../size.js';
 import TileImage from '../source/TileImage.js';
 import _ol_tilecoord_ from '../tilecoord.js';
@@ -166,7 +166,7 @@ TileArcGISRest.prototype.fixedTileUrlFunction = function(tileCoord, pixelRatio,
     'FORMAT': 'PNG32',
     'TRANSPARENT': true
   };
-  _ol_obj_.assign(baseParams, this.params_);
+  assign(baseParams, this.params_);
 
   return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
     pixelRatio, projection, baseParams);
@@ -179,7 +179,7 @@ TileArcGISRest.prototype.fixedTileUrlFunction = function(tileCoord, pixelRatio,
  * @api
  */
 TileArcGISRest.prototype.updateParams = function(params) {
-  _ol_obj_.assign(this.params_, params);
+  assign(this.params_, params);
   this.setKey(this.getKeyForParams_());
 };
 export default TileArcGISRest;
diff --git a/src/ol/source/TileWMS.js b/src/ol/source/TileWMS.js
index eaa1df5706..6c68682f9e 100644
--- a/src/ol/source/TileWMS.js
+++ b/src/ol/source/TileWMS.js
@@ -6,7 +6,7 @@ import {DEFAULT_WMS_VERSION} from './common.js';
 import {inherits} from '../index.js';
 import {assert} from '../asserts.js';
 import {buffer, createEmpty} from '../extent.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import {modulo} from '../math.js';
 import {get as getProjection, transform, transformExtent} from '../proj.js';
 import _ol_reproj_ from '../reproj.js';
@@ -148,7 +148,7 @@ TileWMS.prototype.getGetFeatureInfoUrl = function(coordinate, resolution, projec
     'TRANSPARENT': true,
     'QUERY_LAYERS': this.params_['LAYERS']
   };
-  _ol_obj_.assign(baseParams, this.params_, params);
+  assign(baseParams, this.params_, params);
 
   const x = Math.floor((coordinate[0] - tileExtent[0]) / tileResolution);
   const y = Math.floor((tileExtent[3] - coordinate[1]) / tileResolution);
@@ -317,7 +317,7 @@ TileWMS.prototype.fixedTileUrlFunction = function(tileCoord, pixelRatio, project
     'FORMAT': 'image/png',
     'TRANSPARENT': true
   };
-  _ol_obj_.assign(baseParams, this.params_);
+  assign(baseParams, this.params_);
 
   return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
     pixelRatio, projection, baseParams);
@@ -329,7 +329,7 @@ TileWMS.prototype.fixedTileUrlFunction = function(tileCoord, pixelRatio, project
  * @api
  */
 TileWMS.prototype.updateParams = function(params) {
-  _ol_obj_.assign(this.params_, params);
+  assign(this.params_, params);
   this.updateV13_();
   this.setKey(this.getKeyForParams_());
 };
diff --git a/src/ol/source/Vector.js b/src/ol/source/Vector.js
index b02b5807d6..4b8da23c6a 100644
--- a/src/ol/source/Vector.js
+++ b/src/ol/source/Vector.js
@@ -15,7 +15,7 @@ import {containsExtent, equals} from '../extent.js';
 import {xhr} from '../featureloader.js';
 import {TRUE} from '../functions.js';
 import _ol_loadingstrategy_ from '../loadingstrategy.js';
-import _ol_obj_ from '../obj.js';
+import {isEmpty, getValues} from '../obj.js';
 import Source from '../source/Source.js';
 import SourceState from '../source/State.js';
 import VectorEventType from '../source/VectorEventType.js';
@@ -506,8 +506,8 @@ VectorSource.prototype.getFeatures = function() {
     features = this.featuresCollection_.getArray();
   } else if (this.featuresRtree_) {
     features = this.featuresRtree_.getAll();
-    if (!_ol_obj_.isEmpty(this.nullGeometryFeatures_)) {
-      extend(features, _ol_obj_.getValues(this.nullGeometryFeatures_));
+    if (!isEmpty(this.nullGeometryFeatures_)) {
+      extend(features, getValues(this.nullGeometryFeatures_));
     }
   }
   return /** @type {Array.<ol.Feature>} */ (features);
@@ -722,8 +722,7 @@ VectorSource.prototype.handleFeatureChange_ = function(event) {
  * @return {boolean} Is empty.
  */
 VectorSource.prototype.isEmpty = function() {
-  return this.featuresRtree_.isEmpty() &&
-      _ol_obj_.isEmpty(this.nullGeometryFeatures_);
+  return this.featuresRtree_.isEmpty() && isEmpty(this.nullGeometryFeatures_);
 };
 
 
diff --git a/src/ol/source/WMTS.js b/src/ol/source/WMTS.js
index 182f34ce8a..a95f994c74 100644
--- a/src/ol/source/WMTS.js
+++ b/src/ol/source/WMTS.js
@@ -5,7 +5,7 @@ import {inherits} from '../index.js';
 import {expandUrl, createFromTileUrlFunctions, nullTileUrlFunction} from '../tileurlfunction.js';
 import {find, findIndex, includes} from '../array.js';
 import {containsExtent} from '../extent.js';
-import _ol_obj_ from '../obj.js';
+import {assign} from '../obj.js';
 import {get as getProjection, equivalent, transformExtent} from '../proj.js';
 import TileImage from '../source/TileImage.js';
 import WMTSRequestEncoding from '../source/WMTSRequestEncoding.js';
@@ -92,7 +92,7 @@ const WMTS = function(options) {
   };
 
   if (requestEncoding == WMTSRequestEncoding.KVP) {
-    _ol_obj_.assign(context, {
+    assign(context, {
       'Service': 'WMTS',
       'Request': 'GetTile',
       'Version': this.version_,
@@ -135,7 +135,7 @@ const WMTS = function(options) {
             'TileCol': tileCoord[1],
             'TileRow': -tileCoord[2] - 1
           };
-          _ol_obj_.assign(localContext, dimensions);
+          assign(localContext, dimensions);
           let url = template;
           if (requestEncoding == WMTSRequestEncoding.KVP) {
             url = appendParams(url, localContext);
@@ -280,7 +280,7 @@ WMTS.prototype.getKeyForDimensions_ = function() {
  * @api
  */
 WMTS.prototype.updateDimensions = function(dimensions) {
-  _ol_obj_.assign(this.dimensions_, dimensions);
+  assign(this.dimensions_, dimensions);
   this.setKey(this.getKeyForDimensions_());
 };
 
diff --git a/src/ol/structs/PriorityQueue.js b/src/ol/structs/PriorityQueue.js
index c876855270..7531d2d820 100644
--- a/src/ol/structs/PriorityQueue.js
+++ b/src/ol/structs/PriorityQueue.js
@@ -2,7 +2,7 @@
  * @module ol/structs/PriorityQueue
  */
 import {assert} from '../asserts.js';
-import _ol_obj_ from '../obj.js';
+import {clear} from '../obj.js';
 
 /**
  * Priority queue.
@@ -67,7 +67,7 @@ PriorityQueue.DROP = Infinity;
 PriorityQueue.prototype.clear = function() {
   this.elements_.length = 0;
   this.priorities_.length = 0;
-  _ol_obj_.clear(this.queuedElements_);
+  clear(this.queuedElements_);
 };
 
 
diff --git a/src/ol/structs/RBush.js b/src/ol/structs/RBush.js
index 5c3ea43bd0..90afa86aef 100644
--- a/src/ol/structs/RBush.js
+++ b/src/ol/structs/RBush.js
@@ -4,7 +4,7 @@
 import {getUid} from '../index.js';
 import rbush from 'rbush';
 import {createOrUpdate, equals} from '../extent.js';
-import _ol_obj_ from '../obj.js';
+import {isEmpty} from '../obj.js';
 
 /**
  * Wrapper around the RBush by Vladimir Agafonkin.
@@ -193,7 +193,7 @@ RBush.prototype.forEach_ = function(values, callback, opt_this) {
  * @return {boolean} Is empty.
  */
 RBush.prototype.isEmpty = function() {
-  return _ol_obj_.isEmpty(this.items_);
+  return isEmpty(this.items_);
 };
 
 
diff --git a/src/ol/tilegrid.js b/src/ol/tilegrid.js
index e7c11bdce0..141129d376 100644
--- a/src/ol/tilegrid.js
+++ b/src/ol/tilegrid.js
@@ -5,7 +5,7 @@ import {DEFAULT_MAX_ZOOM, DEFAULT_TILE_SIZE} from './tilegrid/common.js';
 import _ol_size_ from './size.js';
 import {containsCoordinate, createOrUpdate, getCorner, getHeight, getWidth} from './extent.js';
 import Corner from './extent/Corner.js';
-import _ol_obj_ from './obj.js';
+import {assign} from './obj.js';
 import {get as getProjection, METERS_PER_UNIT} from './proj.js';
 import Units from './proj/Units.js';
 import TileGrid from './tilegrid/TileGrid.js';
@@ -80,7 +80,7 @@ _ol_tilegrid_.createForExtent = function(extent, opt_maxZoom, opt_tileSize, opt_
  */
 _ol_tilegrid_.createXYZ = function(opt_options) {
   const options = /** @type {olx.tilegrid.TileGridOptions} */ ({});
-  _ol_obj_.assign(options, opt_options !== undefined ?
+  assign(options, opt_options !== undefined ?
     opt_options : /** @type {olx.tilegrid.XYZOptions} */ ({}));
   if (options.extent === undefined) {
     options.extent = getProjection('EPSG:3857').getExtent();
diff --git a/src/ol/webgl/Context.js b/src/ol/webgl/Context.js
index 2ced8e78b9..b4dbfe3a71 100644
--- a/src/ol/webgl/Context.js
+++ b/src/ol/webgl/Context.js
@@ -5,7 +5,7 @@ import {WEBGL_EXTENSIONS, getUid, inherits} from '../index.js';
 import Disposable from '../Disposable.js';
 import {includes} from '../array.js';
 import _ol_events_ from '../events.js';
-import _ol_obj_ from '../obj.js';
+import {clear} from '../obj.js';
 import _ol_webgl_ from '../webgl.js';
 import ContextEventType from '../webgl/ContextEventType.js';
 
@@ -247,9 +247,9 @@ _ol_webgl_Context_.prototype.getProgram = function(
  * FIXME empy description for jsdoc
  */
 _ol_webgl_Context_.prototype.handleWebGLContextLost = function() {
-  _ol_obj_.clear(this.bufferCache_);
-  _ol_obj_.clear(this.shaderCache_);
-  _ol_obj_.clear(this.programCache_);
+  clear(this.bufferCache_);
+  clear(this.shaderCache_);
+  clear(this.programCache_);
   this.currentProgram_ = null;
   this.hitDetectionFramebuffer_ = null;
   this.hitDetectionTexture_ = null;
diff --git a/test/rendering/ol/layer/image.test.js b/test/rendering/ol/layer/image.test.js
index b7929c1c55..50ed67827b 100644
--- a/test/rendering/ol/layer/image.test.js
+++ b/test/rendering/ol/layer/image.test.js
@@ -1,7 +1,7 @@
 import Map from '../../../../src/ol/Map.js';
 import View from '../../../../src/ol/View.js';
 import ImageLayer from '../../../../src/ol/layer/Image.js';
-import _ol_obj_ from '../../../../src/ol/obj.js';
+import {assign} from '../../../../src/ol/obj.js';
 import {get as getProjection, transform, transformExtent} from '../../../../src/ol/proj.js';
 import Static from '../../../../src/ol/source/ImageStatic.js';
 import _ol_tilegrid_ from '../../../../src/ol/tilegrid.js';
@@ -56,7 +56,7 @@ describe('ol.rendering.layer.Image', function() {
       const options = {
         source: source
       };
-      _ol_obj_.assign(options, layerOptions);
+      assign(options, layerOptions);
       map.addLayer(new ImageLayer(options));
     });
   }
diff --git a/test/rendering/ol/layer/tile.test.js b/test/rendering/ol/layer/tile.test.js
index da11991f08..f3da771674 100644
--- a/test/rendering/ol/layer/tile.test.js
+++ b/test/rendering/ol/layer/tile.test.js
@@ -3,7 +3,7 @@ import View from '../../../../src/ol/View.js';
 import * as _ol_extent_ from '../../../../src/ol/extent.js';
 import Point from '../../../../src/ol/geom/Point.js';
 import TileLayer from '../../../../src/ol/layer/Tile.js';
-import _ol_obj_ from '../../../../src/ol/obj.js';
+import {assign} from '../../../../src/ol/obj.js';
 import {transform} from '../../../../src/ol/proj.js';
 import TileImage from '../../../../src/ol/source/TileImage.js';
 import XYZ from '../../../../src/ol/source/XYZ.js';
@@ -65,7 +65,7 @@ describe('ol.rendering.layer.Tile', function() {
       const options = {
         source: source
       };
-      _ol_obj_.assign(options, layerOptions[i] || layerOptions);
+      assign(options, layerOptions[i] || layerOptions);
       map.addLayer(new TileLayer(options));
     });
   }
diff --git a/test/rendering/ol/layer/vectortile.test.js b/test/rendering/ol/layer/vectortile.test.js
index 93f9770237..b4fdea27d9 100644
--- a/test/rendering/ol/layer/vectortile.test.js
+++ b/test/rendering/ol/layer/vectortile.test.js
@@ -5,7 +5,7 @@ import MVT from '../../../../src/ol/format/MVT.js';
 import Point from '../../../../src/ol/geom/Point.js';
 import VectorLayer from '../../../../src/ol/layer/Vector.js';
 import VectorTileLayer from '../../../../src/ol/layer/VectorTile.js';
-import _ol_obj_ from '../../../../src/ol/obj.js';
+import {assign} from '../../../../src/ol/obj.js';
 import VectorSource from '../../../../src/ol/source/Vector.js';
 import VectorTileSource from '../../../../src/ol/source/VectorTile.js';
 import CircleStyle from '../../../../src/ol/style/Circle.js';
@@ -61,7 +61,7 @@ describe('ol.rendering.layer.VectorTile', function() {
     const options = {
       source: source
     };
-    _ol_obj_.assign(options, layerOptions);
+    assign(options, layerOptions);
     map.addLayer(new VectorTileLayer(options));
   }
 
diff --git a/test/spec/ol/feature.test.js b/test/spec/ol/feature.test.js
index cdac229adc..ca131bc043 100644
--- a/test/spec/ol/feature.test.js
+++ b/test/spec/ol/feature.test.js
@@ -1,6 +1,6 @@
 import Feature from '../../../src/ol/Feature.js';
 import Point from '../../../src/ol/geom/Point.js';
-import _ol_obj_ from '../../../src/ol/obj.js';
+import {isEmpty} from '../../../src/ol/obj.js';
 import Style from '../../../src/ol/style/Style.js';
 
 
@@ -85,7 +85,7 @@ describe('ol.Feature', function() {
     it('is empty by default', function() {
       const feature = new Feature();
       const properties = feature.getProperties();
-      expect(_ol_obj_.isEmpty(properties)).to.be(true);
+      expect(isEmpty(properties)).to.be(true);
     });
 
   });
diff --git a/test/spec/ol/layer/group.test.js b/test/spec/ol/layer/group.test.js
index 19426813d4..df1020af09 100644
--- a/test/spec/ol/layer/group.test.js
+++ b/test/spec/ol/layer/group.test.js
@@ -4,7 +4,7 @@ import Collection from '../../../../src/ol/Collection.js';
 import * as _ol_extent_ from '../../../../src/ol/extent.js';
 import LayerGroup from '../../../../src/ol/layer/Group.js';
 import Layer from '../../../../src/ol/layer/Layer.js';
-import _ol_obj_ from '../../../../src/ol/obj.js';
+import {assign} from '../../../../src/ol/obj.js';
 import MapRenderer from '../../../../src/ol/renderer/Map.js';
 import Source from '../../../../src/ol/source/Source.js';
 
@@ -373,9 +373,9 @@ describe('ol.layer.Group', function() {
       expect(layerStatesArray[0]).to.eql(layer1.getLayerState());
 
       // layer state should match except for layer reference
-      const layerState = _ol_obj_.assign({}, layerStatesArray[0]);
+      const layerState = assign({}, layerStatesArray[0]);
       delete layerState.layer;
-      const groupState = _ol_obj_.assign({}, layerGroup.getLayerState());
+      const groupState = assign({}, layerGroup.getLayerState());
       delete groupState.layer;
       expect(layerState).to.eql(groupState);
 
@@ -421,14 +421,14 @@ describe('ol.layer.Group', function() {
       // compare layer state to group state
 
       // layer state should match except for layer reference
-      let layerState = _ol_obj_.assign({}, layerStatesArray[0]);
+      let layerState = assign({}, layerStatesArray[0]);
       delete layerState.layer;
-      const groupState = _ol_obj_.assign({}, layerGroup.getLayerState());
+      const groupState = assign({}, layerGroup.getLayerState());
       delete groupState.layer;
       expect(layerState).to.eql(groupState);
 
       // layer state should be transformed (and we ignore layer reference)
-      layerState = _ol_obj_.assign({}, layerStatesArray[1]);
+      layerState = assign({}, layerStatesArray[1]);
       delete layerState.layer;
       expect(layerState).to.eql({
         opacity: 0.25,
diff --git a/test/spec/ol/objectutil.test.js b/test/spec/ol/objectutil.test.js
index 487409769d..040a2de51f 100644
--- a/test/spec/ol/objectutil.test.js
+++ b/test/spec/ol/objectutil.test.js
@@ -1,11 +1,11 @@
-import _ol_obj_ from '../../../src/ol/obj.js';
+import {assign, clear, isEmpty, getValues} from '../../../src/ol/obj.js';
 
 
 describe('ol.obj.assign()', function() {
 
   it('is an alias for Object.assign() where available', function() {
     if (typeof Object.assign === 'function') {
-      expect(_ol_obj_.assign).to.be(Object.assign);
+      expect(assign).to.be(Object.assign);
     }
   });
 
@@ -21,7 +21,7 @@ describe('ol.obj.assign()', function() {
       targetProp1: 'targetValue1'
     };
 
-    const assigned = _ol_obj_.assign(target, source);
+    const assigned = assign(target, source);
     expect(assigned).to.be(target);
     expect(assigned.sourceProp1).to.be('sourceValue1');
     expect(assigned.sourceProp2).to.be('sourceValue2');
@@ -30,13 +30,13 @@ describe('ol.obj.assign()', function() {
   });
 
   it('throws a TypeError with `undefined` as target', function() {
-    expect(_ol_obj_.assign).withArgs(undefined).to.throwException(function(e) {
+    expect(assign).withArgs(undefined).to.throwException(function(e) {
       expect(e).to.be.a(TypeError);
     });
   });
 
   it('throws a TypeError with `null` as target', function() {
-    expect(_ol_obj_.assign).withArgs(null).to.throwException(function(e) {
+    expect(assign).withArgs(null).to.throwException(function(e) {
       expect(e).to.be.a(TypeError);
     });
   });
@@ -46,8 +46,6 @@ describe('ol.obj.assign()', function() {
 describe('ol.obj.clear()', function() {
 
   it('removes all properties from an object', function() {
-    const clear = _ol_obj_.clear;
-    const isEmpty = _ol_obj_.isEmpty;
     expect(isEmpty(clear({foo: 'bar'}))).to.be(true);
     expect(isEmpty(clear({foo: 'bar', num: 42}))).to.be(true);
     expect(isEmpty(clear({}))).to.be(true);
@@ -59,8 +57,8 @@ describe('ol.obj.clear()', function() {
 describe('ol.obj.getValues()', function() {
 
   it('gets a list of property values from an object', function() {
-    expect(_ol_obj_.getValues({foo: 'bar', num: 42}).sort()).to.eql([42, 'bar']);
-    expect(_ol_obj_.getValues(null)).to.eql([]);
+    expect(getValues({foo: 'bar', num: 42}).sort()).to.eql([42, 'bar']);
+    expect(getValues(null)).to.eql([]);
   });
 
 });
@@ -68,10 +66,10 @@ describe('ol.obj.getValues()', function() {
 describe('ol.obj.isEmpty()', function() {
 
   it('checks if an object has any properties', function() {
-    expect(_ol_obj_.isEmpty({})).to.be(true);
-    expect(_ol_obj_.isEmpty(null)).to.be(true);
-    expect(_ol_obj_.isEmpty({foo: 'bar'})).to.be(false);
-    expect(_ol_obj_.isEmpty({foo: false})).to.be(false);
+    expect(isEmpty({})).to.be(true);
+    expect(isEmpty(null)).to.be(true);
+    expect(isEmpty({foo: 'bar'})).to.be(false);
+    expect(isEmpty({foo: false})).to.be(false);
   });
 
 });
diff --git a/test/spec/ol/pointer/touchsource.test.js b/test/spec/ol/pointer/touchsource.test.js
index d834b48644..97bf833045 100644
--- a/test/spec/ol/pointer/touchsource.test.js
+++ b/test/spec/ol/pointer/touchsource.test.js
@@ -2,8 +2,9 @@ import _ol_events_ from '../../../../src/ol/events.js';
 import Event from '../../../../src/ol/events/Event.js';
 import EventTarget from '../../../../src/ol/events/EventTarget.js';
 import _ol_has_ from '../../../../src/ol/has.js';
-import _ol_obj_ from '../../../../src/ol/obj.js';
+import {assign} from '../../../../src/ol/obj.js';
 import PointerEventHandler from '../../../../src/ol/pointer/PointerEventHandler.js';
+
 describe('ol.pointer.TouchSource', function() {
   let handler;
   let target;
@@ -123,7 +124,7 @@ describe('ol.pointer.TouchSource', function() {
     touches = touches !== undefined ? touches : changedTouches;
 
     const event = new Event(type);
-    _ol_obj_.assign(event, {
+    assign(event, {
       touches: touches,
       changedTouches: changedTouches
     });
diff --git a/test/spec/ol/render/canvas/index.test.js b/test/spec/ol/render/canvas/index.test.js
index 5975b4f27d..8b79717426 100644
--- a/test/spec/ol/render/canvas/index.test.js
+++ b/test/spec/ol/render/canvas/index.test.js
@@ -1,5 +1,5 @@
 import _ol_events_ from '../../../../../src/ol/events.js';
-import _ol_obj_ from '../../../../../src/ol/obj.js';
+import {clear} from '../../../../../src/ol/obj.js';
 import _ol_render_canvas_ from '../../../../../src/ol/render/canvas.js';
 
 
@@ -13,7 +13,7 @@ describe('ol.render.canvas', function() {
   describe('ol.render.canvas.checkFont()', function() {
 
     beforeEach(function() {
-      _ol_obj_.clear(_ol_render_canvas_.checkedFonts_);
+      clear(_ol_render_canvas_.checkedFonts_);
       _ol_render_canvas_.getMeasureContext();
       _ol_render_canvas_.measureTextHeight('12px sans-serif');
     });
diff --git a/test/spec/ol/renderer/canvas/vectorlayer.test.js b/test/spec/ol/renderer/canvas/vectorlayer.test.js
index 1e12a46c81..f50a21f2ee 100644
--- a/test/spec/ol/renderer/canvas/vectorlayer.test.js
+++ b/test/spec/ol/renderer/canvas/vectorlayer.test.js
@@ -5,7 +5,7 @@ import View from '../../../../../src/ol/View.js';
 import * as _ol_extent_ from '../../../../../src/ol/extent.js';
 import Point from '../../../../../src/ol/geom/Point.js';
 import VectorLayer from '../../../../../src/ol/layer/Vector.js';
-import _ol_obj_ from '../../../../../src/ol/obj.js';
+import {clear} from '../../../../../src/ol/obj.js';
 import {get as getProjection} from '../../../../../src/ol/proj.js';
 import _ol_render_canvas_ from '../../../../../src/ol/render/canvas.js';
 import CanvasVectorLayerRenderer from '../../../../../src/ol/renderer/canvas/VectorLayer.js';
@@ -85,7 +85,7 @@ describe('ol.renderer.canvas.VectorLayer', function() {
     });
 
     it('does not re-render for unavailable fonts', function(done) {
-      _ol_obj_.clear(_ol_render_canvas_.checkedFonts_);
+      clear(_ol_render_canvas_.checkedFonts_);
       const map = new Map({
         view: new View({
           center: [0, 0],
@@ -116,7 +116,7 @@ describe('ol.renderer.canvas.VectorLayer', function() {
     });
 
     it('does not re-render for available fonts', function(done) {
-      _ol_obj_.clear(_ol_render_canvas_.checkedFonts_);
+      clear(_ol_render_canvas_.checkedFonts_);
       const map = new Map({
         view: new View({
           center: [0, 0],
@@ -147,7 +147,7 @@ describe('ol.renderer.canvas.VectorLayer', function() {
     });
 
     it('re-renders for fonts that become available', function(done) {
-      _ol_obj_.clear(_ol_render_canvas_.checkedFonts_);
+      clear(_ol_render_canvas_.checkedFonts_);
       head.appendChild(font);
       const map = new Map({
         view: new View({
diff --git a/test/spec/ol/renderer/canvas/vectortilelayer.test.js b/test/spec/ol/renderer/canvas/vectortilelayer.test.js
index 9c205c3757..009303e0fb 100644
--- a/test/spec/ol/renderer/canvas/vectortilelayer.test.js
+++ b/test/spec/ol/renderer/canvas/vectortilelayer.test.js
@@ -1,5 +1,5 @@
 import {getUid, inherits} from '../../../../../src/ol/index.js';
-import _ol_obj_ from '../../../../../src/ol/obj.js';
+import {clear} from '../../../../../src/ol/obj.js';
 import Feature from '../../../../../src/ol/Feature.js';
 import Map from '../../../../../src/ol/Map.js';
 import TileState from '../../../../../src/ol/TileState.js';
@@ -154,7 +154,7 @@ describe('ol.renderer.canvas.VectorTileLayer', function() {
 
     it('does not re-render for unavailable fonts', function(done) {
       map.renderSync();
-      _ol_obj_.clear(_ol_render_canvas_.checkedFonts_);
+      clear(_ol_render_canvas_.checkedFonts_);
       layerStyle[0].getText().setFont('12px "Unavailable font",sans-serif');
       layer.changed();
       const revision = layer.getRevision();
@@ -166,7 +166,7 @@ describe('ol.renderer.canvas.VectorTileLayer', function() {
 
     it('does not re-render for available fonts', function(done) {
       map.renderSync();
-      _ol_obj_.clear(_ol_render_canvas_.checkedFonts_);
+      clear(_ol_render_canvas_.checkedFonts_);
       layerStyle[0].getText().setFont('12px sans-serif');
       layer.changed();
       const revision = layer.getRevision();
@@ -178,7 +178,7 @@ describe('ol.renderer.canvas.VectorTileLayer', function() {
 
     it('re-renders for fonts that become available', function(done) {
       map.renderSync();
-      _ol_obj_.clear(_ol_render_canvas_.checkedFonts_);
+      clear(_ol_render_canvas_.checkedFonts_);
       head.appendChild(font);
       layerStyle[0].getText().setFont('12px "Dancing Script",sans-serif');
       layer.changed();