Move Add-on SDK source to toolkit/jetpack

toolkit/jetpack/sdk/panel/events.js

@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// This module basically translates system/events to a SDK standard events
+// so that `map`, `filter` and other utilities could be used with them.
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const events = require("../system/events");
+const { emit } = require("../event/core");
+
+var channel = {};
+
+function forward({ subject, type, data }) {
+  return emit(channel, "data", { target: subject, type: type, data: data });
+}
+
+["popupshowing", "popuphiding", "popupshown", "popuphidden",
+"document-element-inserted", "DOMContentLoaded", "load"
+].forEach(type => events.on(type, forward));
+
+exports.events = channel;