1 files changed, 11 insertions, 2 deletions
diff --git a/components/script/dom/promise.rs b/components/script/dom/promise.rs
index 81149f8e193..0afcfcba266 100644
--- a/components/script/dom/promise.rs
+++ b/components/script/dom/promise.rs
@@ -23,8 +23,8 @@ use js::conversions::ToJSValConvertible;
 use js::jsapi::{CallOriginalPromiseResolve, CallOriginalPromiseReject, CallOriginalPromiseThen};
 use js::jsapi::{JSAutoCompartment, CallArgs, JS_GetFunctionObject, JS_NewFunction};
 use js::jsapi::{JSContext, HandleValue, HandleObject, IsPromiseObject, GetFunctionNativeReserved};
-use js::jsapi::{JS_ClearPendingException, JSObject, AddRawValueRoot, RemoveRawValueRoot};
-use js::jsapi::{MutableHandleObject, NewPromiseObject, ResolvePromise, RejectPromise};
+use js::jsapi::{JS_ClearPendingException, JSObject, AddRawValueRoot, RemoveRawValueRoot, PromiseState};
+use js::jsapi::{MutableHandleObject, NewPromiseObject, ResolvePromise, RejectPromise, GetPromiseState};
 use js::jsapi::{SetFunctionNativeReserved, NewFunctionWithReserved, AddPromiseReactions};
 use js::jsval::{JSVal, UndefinedValue, ObjectValue, Int32Value};
 use std::ptr;
@@ -200,6 +200,15 @@ impl Promise {
     }
 
     #[allow(unsafe_code)]
+    pub fn is_settled(&self) -> bool {
+        let state = unsafe { GetPromiseState(self.promise_obj()) };
+        match state {
+            PromiseState::Rejected | PromiseState::Fulfilled => true,
+            _ => false
+        }
+    }
+
+    #[allow(unsafe_code)]
     fn promise_obj(&self) -> HandleObject {
         let obj = self.reflector().get_jsobject();
         unsafe {