From 46e9fa479b8d634837d8dd4bf0972fdf7af8b099 Mon Sep 17 00:00:00 2001
From: Gabe Levi <gabe@fb.com>
Date: Wed, 14 Sep 2016 09:40:22 -0400
Subject: [PATCH] Use the entire Promise.prototype.done polyfill

---
 packages/fbjs/src/core/Deferred.js | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/packages/fbjs/src/core/Deferred.js b/packages/fbjs/src/core/Deferred.js
index 0668a0d6..dfdc1af1 100644
--- a/packages/fbjs/src/core/Deferred.js
+++ b/packages/fbjs/src/core/Deferred.js
@@ -57,7 +57,16 @@ class Deferred<Tvalue, Treason> {
   }
 
   done(): void {
-    Promise.prototype.then.apply(this._promise, arguments);
+    // Embed the polyfill for the non-standard Promise.prototype.done so that
+    // users of the open source fbjs don't need a custom lib for Promise
+    const self = arguments.length ?
+      this._promise.then.apply(this._promise, arguments) :
+      this._promise;
+    self.then(undefined, function(err) {
+      setTimeout(function() {
+        throw err;
+      }, 0);
+    });
   }
 
   isSettled(): boolean {