diff --git a/js/modules/sleep.js b/js/modules/sleep.js
new file mode 100644
index 00000000000..4cc0fc61f07
--- /dev/null
+++ b/js/modules/sleep.js
@@ -0,0 +1,4 @@
+/* global setTimeout */
+
+exports.sleep = ms =>
+  new Promise(resolve => setTimeout(resolve, ms));