From 8cdfc6e17cff661ac5e1edfc54ae76f98d48943d Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Sun, 23 Jun 2019 14:26:40 +0200
Subject: [PATCH] Do not use self to check browser features

---
 src/ol/source/Tile.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ol/source/Tile.js b/src/ol/source/Tile.js
index 0d66af54b8..c311e88d69 100644
--- a/src/ol/source/Tile.js
+++ b/src/ol/source/Tile.js
@@ -75,7 +75,7 @@ class TileSource extends Source {
       if (tileGrid) {
         toSize(tileGrid.getTileSize(tileGrid.getMinZoom()), tileSize);
       }
-      const canUseScreen = 'screen' in self;
+      const canUseScreen = typeof screen !== 'undefined';
       const width = canUseScreen ? (screen.availWidth || screen.width) : 1920;
       const height = canUseScreen ? (screen.availHeight || screen.height) : 1080;
       cacheSize = 4 * Math.ceil(width / tileSize[0]) * Math.ceil(height / tileSize[1]);