From 9abbb97f487ab233cbce02f82616fe58c5931a1a Mon Sep 17 00:00:00 2001
From: Thomas Gossmann <gossi@users.noreply.github.com>
Date: Wed, 16 May 2018 17:30:14 +0200
Subject: [PATCH] Make third argument of addObserver and removeObserver
 optional

---
 types/ember/index.d.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/types/ember/index.d.ts b/types/ember/index.d.ts
index a35ed40dec..0d3c957a5b 100755
--- a/types/ember/index.d.ts
+++ b/types/ember/index.d.ts
@@ -1683,7 +1683,7 @@ declare module 'ember' {
             addObserver<Target>(
                 key: keyof this,
                 target: Target,
-                method: ObserverMethod<Target, this>
+                method?: ObserverMethod<Target, this>
             ): void;
             /**
              * Remove an observer you have previously registered on this object. Pass
@@ -1693,7 +1693,7 @@ declare module 'ember' {
             removeObserver<Target>(
                 key: keyof this,
                 target: Target,
-                method: ObserverMethod<Target, this>
+                method?: ObserverMethod<Target, this>
             ): any;
             /**
              * Retrieves the value of a property, or a default value in the case that the