Make classes in ol/ available as named exports from ol

src/ol/util.js

@@ -0,0 +1,55 @@
+/**
+ * @module ol/util
+ */
+
+/**
+ * Inherit the prototype methods from one constructor into another.
+ *
+ * Usage:
+ *
+ *     function ParentClass(a, b) { }
+ *     ParentClass.prototype.foo = function(a) { }
+ *
+ *     function ChildClass(a, b, c) {
+ *       // Call parent constructor
+ *       ParentClass.call(this, a, b);
+ *     }
+ *     inherits(ChildClass, ParentClass);
+ *
+ *     var child = new ChildClass('a', 'b', 'see');
+ *     child.foo(); // This works.
+ *
+ * @param {!Function} childCtor Child constructor.
+ * @param {!Function} parentCtor Parent constructor.
+ * @function module:ol.inherits
+ * @api
+ */
+export function inherits(childCtor, parentCtor) {
+  childCtor.prototype = Object.create(parentCtor.prototype);
+  childCtor.prototype.constructor = childCtor;
+}
+
+/**
+ * Counter for getUid.
+ * @type {number}
+ * @private
+ */
+let uidCounter_ = 0;
+
+/**
+ * Gets a unique ID for an object. This mutates the object so that further calls
+ * with the same object as a parameter returns the same value. Unique IDs are generated
+ * as a strictly increasing sequence. Adapted from goog.getUid.
+ *
+ * @param {Object} obj The object to get the unique ID for.
+ * @return {number} The unique ID for the object.
+ */
+export function getUid(obj) {
+  return obj.ol_uid || (obj.ol_uid = ++uidCounter_);
+}
+
+/**
+ * OpenLayers version.
+ * @type {string}
+ */
+export const VERSION = '5.0.0-beta.14';