diff --git a/externs/olx.js b/externs/olx.js
index aba6f65df3..6f7253638a 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -5,49 +5,6 @@
 let olx;
 
 
-/**
- * @typedef {{className: (string|undefined),
- *     condition: (ol.EventsConditionType|undefined),
- *     duration: (number|undefined),
- *     out: (boolean|undefined)}}
- */
-olx.interaction.DragZoomOptions;
-
-
-/**
- * CSS class name for styling the box. The default is `ol-dragzoom`.
- * @type {string|undefined}
- * @api
- */
-olx.interaction.DragZoomOptions.prototype.className;
-
-
-/**
- * A function that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a boolean
- * to indicate whether that event should be handled.
- * Default is {@link ol.events.condition.shiftKeyOnly}.
- * @type {ol.EventsConditionType|undefined}
- * @api
- */
-olx.interaction.DragZoomOptions.prototype.condition;
-
-
-/**
- * Animation duration in milliseconds. Default is `200`.
- * @type {number|undefined}
- * @api
- */
-olx.interaction.DragZoomOptions.prototype.duration;
-
-
-/**
- * Use interaction for zooming out. Default is `false`.
- * @type {boolean|undefined}
- * @api
- */
-olx.interaction.DragZoomOptions.prototype.out;
-
-
 /**
  * @typedef {{clickTolerance: (number|undefined),
  *     features: (ol.Collection.<module:ol/Feature~Feature>|undefined),
diff --git a/externs/xol.js b/externs/xol.js
index bad56e6d09..7dc83663ef 100644
--- a/externs/xol.js
+++ b/externs/xol.js
@@ -1,15 +1,4 @@
 
-/**
- * @typedef {Object} interaction_DragZoomOptions
- * @property {string|undefined} className CSS class name for styling the box. The default is `ol-dragzoom`.
- * @property {ol.EventsConditionType|undefined} condition A function that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a boolean
- * to indicate whether that event should be handled.
- * Default is {@link ol.events.condition.shiftKeyOnly}.
- * @property {number|undefined} duration Animation duration in milliseconds. Default is `200`.
- * @property {boolean|undefined} out Use interaction for zooming out. Default is `false`.
- */
-
-
 /**
  * @typedef {Object} interaction_DrawOptions
  * @property {number|undefined} clickTolerance The maximum distance in pixels between "down" and "up" for a "up" event
diff --git a/src/ol/interaction/DragZoom.js b/src/ol/interaction/DragZoom.js
index 839d892c64..ffaa340c8b 100644
--- a/src/ol/interaction/DragZoom.js
+++ b/src/ol/interaction/DragZoom.js
@@ -7,18 +7,32 @@ import {shiftKeyOnly} from '../events/condition.js';
 import {createOrUpdateFromCoordinates, getBottomLeft, getCenter, getTopRight, scaleFromCenter} from '../extent.js';
 import DragBox from '../interaction/DragBox.js';
 
+
+/**
+ * @typedef {Object} Options
+ * @property {string} [className='ol-dragzoom'] CSS class name for styling the
+ * box.
+ * @property {module:ol/events/condition~Condition} [condition] A function that
+ * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a
+ * boolean to indicate whether that event should be handled.
+ * Default is {@link module:ol/events/condition~shiftKeyOnly}.
+ * @property {number} [duration=200] Animation duration in milliseconds.
+ * @property {boolean} [out=false] Use interaction for zooming out.
+ */
+
+
 /**
  * @classdesc
  * Allows the user to zoom the map by clicking and dragging on the map,
- * normally combined with an {@link ol.events.condition} that limits
+ * normally combined with an {@link module:ol/events/condition} that limits
  * it to when a key, shift by default, is held down.
  *
  * To change the style of the box, use CSS and the `.ol-dragzoom` selector, or
  * your custom one configured with `className`.
  *
  * @constructor
- * @extends {ol.interaction.DragBox}
- * @param {olx.interaction.DragZoomOptions=} opt_options Options.
+ * @extends {module:ol/interaction/DragBox~DragBox}
+ * @param {ol/interaction/DragZoom~Options=} opt_options Options.
  * @api
  */
 const DragZoom = function(opt_options) {
@@ -54,7 +68,7 @@ inherits(DragZoom, DragBox);
 DragZoom.prototype.onBoxEnd = function() {
   const map = this.getMap();
 
-  const view = /** @type {!ol.View} */ (map.getView());
+  const view = /** @type {!module:ol/View~View} */ (map.getView());
 
   const size = /** @type {!module:ol/size~Size} */ (map.getSize());