Start of cosmopolite externs.

externs/cosmopolite.js

@@ -0,0 +1,31 @@
+/**
+ * @fileoverview Definitions for Cosmopolite API. Details of the API are at:
+ * https://www.cosmopolite.org/reference
+ *
+ * @externs
+ * @author ian@cosmopolite.org (Ian Gulliver)
+ */
+
+/**
+ * @see https://www.cosmopolite.org/reference#constructor
+ * @constructor
+ * @param {?Cosmopolite.typeCallbacks=} opt_callbacks
+ * @param {?string=} opt_urlPrefix
+ * @param {?string=} opt_namespace
+ * @param {?string=} opt_trackingID
+ * @nosideeffects
+ */
+function Cosmopolite(
+    opt_callbacks, opt_urlPrefix, opt_namespace, opt_trackingID) {}
+
+
+/**
+ * @see https://www.cosmopolite.org/reference#subscribe
+ * @param {Cosmopolite.typeSubjectLoose|Array.<Cosmopolite.typeSubjectLoose>}
+ *     subjects
+ * @param {?number=} opt_messages
+ * @param {?number=} opt_lastID
+ * @return {Promise|Array.<Promise>}
+ */
+Cosmopolite.prototype.subscribe =
+  function(subjects, opt_messages, opt_lastID) {};