1 files changed, 25 insertions, 0 deletions
diff --git a/devtools/shared/defer.js b/devtools/shared/defer.js
new file mode 100644
index 0000000000..86313d9a32
--- /dev/null
+++ b/devtools/shared/defer.js
@@ -0,0 +1,25 @@
+/* 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";
+
+/**
+ * Create a Promise and return it in an object with its resolve and reject functions.
+ * This is useful when you need to settle a promise in a different location than where
+ * it is created.
+ *
+ * @returns {Object} An object with the following properties:
+ *   - {Promise} promise: The created DOM promise
+ *   - {Function} resolve: The resolve parameter of `promise`
+ *   - {Function} reject: The reject parameter of `promise`
+ *
+ */
+module.exports = function defer() {
+  let resolve, reject;
+  const promise = new Promise(function (res, rej) {
+    resolve = res;
+    reject = rej;
+  });
+  return { resolve, reject, promise };
+};