Imports cased like the filename

src/ol/source/OSM.js

@@ -0,0 +1,58 @@
+goog.provide('ol.source.OSM');
+
+goog.require('ol');
+goog.require('ol.source.XYZ');
+
+
+/**
+ * @classdesc
+ * Layer source for the OpenStreetMap tile server.
+ *
+ * @constructor
+ * @extends {ol.source.XYZ}
+ * @param {olx.source.OSMOptions=} opt_options Open Street Map options.
+ * @api
+ */
+ol.source.OSM = function(opt_options) {
+
+  var options = opt_options || {};
+
+  var attributions;
+  if (options.attributions !== undefined) {
+    attributions = options.attributions;
+  } else {
+    attributions = [ol.source.OSM.ATTRIBUTION];
+  }
+
+  var crossOrigin = options.crossOrigin !== undefined ?
+    options.crossOrigin : 'anonymous';
+
+  var url = options.url !== undefined ?
+    options.url : 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png';
+
+  ol.source.XYZ.call(this, {
+    attributions: attributions,
+    cacheSize: options.cacheSize,
+    crossOrigin: crossOrigin,
+    opaque: options.opaque !== undefined ? options.opaque : true,
+    maxZoom: options.maxZoom !== undefined ? options.maxZoom : 19,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileLoadFunction: options.tileLoadFunction,
+    url: url,
+    wrapX: options.wrapX
+  });
+
+};
+ol.inherits(ol.source.OSM, ol.source.XYZ);
+
+
+/**
+ * The attribution containing a link to the OpenStreetMap Copyright and License
+ * page.
+ * @const
+ * @type {string}
+ * @api
+ */
+ol.source.OSM.ATTRIBUTION = '© ' +
+      '<a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> ' +
+      'contributors.';