From 909869b8b9885b9330e1433ea9a7d72988a8fdd5 Mon Sep 17 00:00:00 2001
From: Kevin Schmidt <kschmidt@caci.com>
Date: Wed, 3 Oct 2018 06:35:18 -0600
Subject: [PATCH] Fix type check errors in ol/interaction/Extent

---
 src/ol/interaction/Extent.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ol/interaction/Extent.js b/src/ol/interaction/Extent.js
index c388b65b8f..58de76db9f 100644
--- a/src/ol/interaction/Extent.js
+++ b/src/ol/interaction/Extent.js
@@ -243,7 +243,7 @@ class ExtentInteraction extends PointerInteraction {
         extentFeature = new Feature(polygonFromExtent(extent));
       }
       this.extentFeature_ = extentFeature;
-      this.extentOverlay_.getSource().addFeature(extentFeature);
+      /** @type {VectorSource} */ (this.extentOverlay_.getSource()).addFeature(extentFeature);
     } else {
       if (!extent) {
         extentFeature.setGeometry(undefined);
@@ -264,7 +264,7 @@ class ExtentInteraction extends PointerInteraction {
     if (!vertexFeature) {
       vertexFeature = new Feature(new Point(vertex));
       this.vertexFeature_ = vertexFeature;
-      this.vertexOverlay_.getSource().addFeature(vertexFeature);
+      /** @type {VectorSource} */ (this.vertexOverlay_.getSource()).addFeature(vertexFeature);
     } else {
       const geometry = /** @type {Point} */ (vertexFeature.getGeometry());
       geometry.setCoordinates(vertex);