Merge pull request #11991 from simonseyock/wkt-format-types

Fix some typings in format and format/WKT

test/spec/ol/format/wkt.test.js

@@ -9,7 +9,7 @@ describe('ol.format.WKT', function () {
   describe('#readProjectionFromText', function () {
     it('returns the default projection', function () {
       const projection = format.readProjectionFromText('POINT(1 2)');
-      expect(projection).to.be(null);
+      expect(projection).to.be(undefined);
     });
   });