From 45f2324a4ed3d3e1ab87e81084d9e58294bd1286 Mon Sep 17 00:00:00 2001
From: William Wall <wwall@caci.com>
Date: Wed, 19 Sep 2018 10:02:33 -0600
Subject: [PATCH] Get width as number from number|Size

This satisfies tsc in addition to being a bit more defensive from
custom tile grids, even if using them is very uncommon for this
source.
---
 src/ol/source/Zoomify.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ol/source/Zoomify.js b/src/ol/source/Zoomify.js
index 1bb712c46f..25793f712c 100644
--- a/src/ol/source/Zoomify.js
+++ b/src/ol/source/Zoomify.js
@@ -219,7 +219,8 @@ class Zoomify extends TileImage {
                 tileCoordX +
                 tileCoordY * tierSizeInTiles[tileCoordZ][0];
             const tileSize = tileGrid.getTileSize(tileCoordZ);
-            const tileGroup = ((tileIndex + tileCountUpToTier[tileCoordZ]) / tileSize) | 0;
+            const tileWidth = Array.isArray(tileSize) ? tileSize[0] : tileSize;
+            const tileGroup = ((tileIndex + tileCountUpToTier[tileCoordZ]) / tileWidth) | 0;
             const localContext = {
               'z': tileCoordZ,
               'x': tileCoordX,