Use setTimeout with any return type

src/ol/interaction/Draw.js

@@ -206,7 +206,7 @@ class Draw extends PointerInteraction {
     this.downPx_ = null;
 
     /**
-     * @type {number|undefined}
+     * @type {any}
      * @private
      */
     this.downTimeout_;
@@ -912,7 +912,7 @@ function handleDownEvent(event) {
     return true;
   } else if (this.condition_(event)) {
     this.lastDragTime_ = Date.now();
-    this.downTimeout_ = window.setTimeout(function() {
+    this.downTimeout_ = setTimeout(function() {
       this.handlePointerMove_(new MapBrowserPointerEvent(
         MapBrowserEventType.POINTERMOVE, event.map, event.pointerEvent, false, event.frameState));
     }.bind(this), this.dragVertexDelay_);