Initial simple client implementation

src/util/Util.js

@@ -0,0 +1,35 @@
+'use strict';
+
+const has = (o, k) => Object.prototype.hasOwnProperty.call(o, k);
+
+/**
+ * Utility methods
+ */
+class Util {
+
+  constructor() {
+    throw new Error(`The ${this.constructor.name} class may not be instantiated.`);
+  }
+
+  /**
+  * Sets default properties on an object that aren't already specified.
+  * @param {Object} def Default properties
+  * @param {Object} given Object to assign defaults to
+  * @returns {Object}
+  * @private
+  */
+  static mergeDefault(def, given) {
+    if (!given) return def;
+    for (const key in def) {
+      if (!has(given, key) || given[key] === undefined) {
+        given[key] = def[key];
+      } else if (given[key] === Object(given[key])) {
+        given[key] = Util.mergeDefault(def[key], given[key]);
+      }
+    }
+
+    return given;
+  }
+}
+
+module.exports = Util;