From 681c3169c12d5a072457d10565d771cbe14414a3 Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Thu, 21 Mar 2019 18:50:03 +0100
Subject: [PATCH] Add zDirection memeber to the baes class, for type checking

---
 src/ol/source/Tile.js    | 8 ++++++++
 src/ol/source/Zoomify.js | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/ol/source/Tile.js b/src/ol/source/Tile.js
index 024a94ac46..0d66af54b8 100644
--- a/src/ol/source/Tile.js
+++ b/src/ol/source/Tile.js
@@ -105,6 +105,14 @@ class TileSource extends Source {
      */
     this.tileOptions = {transition: options.transition};
 
+    /**
+     * zDirection hint, read by the renderer. Indicates which resolution should be used
+     * by a renderer if the views resolution does not match any resolution of the tile source.
+     * If 0, the nearest resolution will be used. If 1, the nearest lower resolution
+     * will be used. If -1, the nearest higher resolution will be used.
+     * @type {number=}
+     */
+    this.zDirection;
   }
 
   /**
diff --git a/src/ol/source/Zoomify.js b/src/ol/source/Zoomify.js
index a3a997062e..4baefa3bba 100644
--- a/src/ol/source/Zoomify.js
+++ b/src/ol/source/Zoomify.js
@@ -258,7 +258,7 @@ class Zoomify extends TileImage {
     });
 
     /**
-     * @type {number|undefined}
+     * @inheritDoc
      */
     this.zDirection = options.zDirection;