From d885771d8d704f517710e9de45668e0d5793c82a Mon Sep 17 00:00:00 2001
From: Tim Schaub <tim.schaub@gmail.com>
Date: Wed, 18 Jul 2018 00:52:23 -0600
Subject: [PATCH] Call super before accessing this in BingMaps source

---
 src/ol/source/BingMaps.js | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/ol/source/BingMaps.js b/src/ol/source/BingMaps.js
index c92d5926a1..f3dc8835e1 100644
--- a/src/ol/source/BingMaps.js
+++ b/src/ol/source/BingMaps.js
@@ -54,11 +54,7 @@ class BingMaps extends TileImage {
    */
   constructor(options) {
 
-    /**
-     * @private
-     * @type {boolean}
-     */
-    this.hidpi_ = options.hidpi !== undefined ? options.hidpi : false;
+    const hidpi = options.hidpi !== undefined ? options.hidpi : false;
 
     super({
       cacheSize: options.cacheSize,
@@ -68,11 +64,18 @@ class BingMaps extends TileImage {
       reprojectionErrorThreshold: options.reprojectionErrorThreshold,
       state: SourceState.LOADING,
       tileLoadFunction: options.tileLoadFunction,
-      tilePixelRatio: this.hidpi_ ? 2 : 1,
+      tilePixelRatio: hidpi ? 2 : 1,
       wrapX: options.wrapX !== undefined ? options.wrapX : true,
       transition: options.transition
     });
 
+    /**
+     * @private
+     * @type {boolean}
+     */
+    this.hidpi_ = hidpi;
+
+
     /**
      * @private
      * @type {string}