1 files changed, 42 insertions, 0 deletions
diff --git a/devtools/shared/shims/event-emitter.js b/devtools/shared/shims/event-emitter.js
new file mode 100644
index 000000000..6b3672162
--- /dev/null
+++ b/devtools/shared/shims/event-emitter.js
@@ -0,0 +1,42 @@
+/* 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 file only exists to support add-ons which import this module at a
+ * specific path.
+ */
+
+(function (factory) { // Module boilerplate
+  if (this.module && module.id.indexOf("event-emitter") >= 0) { // require
+    factory.call(this, require, exports, module);
+  } else { // Cu.import
+    const Cu = Components.utils;
+    const { require } =
+      Cu.import("resource://devtools/shared/Loader.jsm", {});
+    this.isWorker = false;
+    this.promise = Cu.import("resource://gre/modules/Promise.jsm", {}).Promise;
+    factory.call(this, require, this, { exports: this });
+    this.EXPORTED_SYMBOLS = ["EventEmitter"];
+  }
+}).call(this, function (require, exports, module) {
+  const { Cu } = require("chrome");
+  const Services = require("Services");
+  const WARNING_PREF = "devtools.migration.warnings";
+  // Cu and Services aren't accessible from workers
+  if (Cu && Services && Services.prefs &&
+      Services.prefs.getBoolPref(WARNING_PREF)) {
+    const { Deprecated } =
+      Cu.import("resource://gre/modules/Deprecated.jsm", {});
+    Deprecated.warning("This path to event-emitter.js is deprecated.  Please " +
+                       "use require(\"devtools/shared/event-emitter\") to " +
+                       "load this module.",
+                       "https://bugzil.la/912121");
+  }
+
+  const EventEmitter = require("devtools/shared/event-emitter");
+  this.EventEmitter = EventEmitter;
+  module.exports = EventEmitter;
+});