diff --git a/js/modules/deferred_to_promise.d.ts b/js/modules/deferred_to_promise.d.ts
new file mode 100644
index 000000000..b4e87b012
--- /dev/null
+++ b/js/modules/deferred_to_promise.d.ts
@@ -0,0 +1 @@
+export function deferredToPromise<T>(deferred: JQuery.Deferred<any, any, any>): Promise<T>;