Remove extent default so we catch errors when extent is not set

src/ol/VectorTile.js

@@ -4,13 +4,6 @@
 import Tile from './Tile.js';
 import TileState from './TileState.js';
 
-/**
- * @const
- * @type {import("./extent.js").Extent}
- */
-const DEFAULT_EXTENT = [0, 0, 4096, 4096];
-
-
 class VectorTile extends Tile {
 
   /**
@@ -89,7 +82,7 @@ class VectorTile extends Tile {
    * @api
    */
   getExtent() {
-    return this.extent_ || DEFAULT_EXTENT;
+    return this.extent_;
   }
 
   /**
@@ -166,7 +159,7 @@ class VectorTile extends Tile {
    * calculated by multiplying the tile size with the tile pixel ratio. For
    * sources using {@link module:ol/format/MVT~MVT} as feature format, the
    * {@link module:ol/format/MVT~MVT#getLastExtent} method will return the correct
-   * extent. The default is `[0, 0, 4096, 4096]`.
+   * extent.
    * @param {import("./extent.js").Extent} extent The extent.
    * @api
    */

src/ol/source/VectorTile.js

@@ -42,12 +42,11 @@ import {equals} from '../array.js';
  *     var data = // ... fetch data
  *     var format = tile.getFormat();
  *     tile.setProjection(format.readProjection(data));
+ *     tile.setExtent(format.getLastExtent()); // line only required for ol/format/MVT
  *     tile.setFeatures(format.readFeatures(data, {
  *       // featureProjection is not required for ol/format/MVT
  *       featureProjection: map.getView().getProjection()
  *     }));
- *     // the line below is only required for ol/format/MVT
- *     tile.setExtent(format.getLastExtent());
  *   }
  * });
  * ```

test/spec/ol/renderer/canvas/vectortilelayer.test.js

@@ -203,6 +203,7 @@ describe('ol.renderer.canvas.VectorTileLayer', function() {
       let tile;
       tileCallback = function(t) {
         t.setProjection(proj);
+        t.setExtent([0, 0, 4096, 4096]);
         tile = t;
       };
       map.renderSync();