diff --git a/packages/core/test/bundling/hello_world_r2/bundle.golden_symbols.json b/packages/core/test/bundling/hello_world_r2/bundle.golden_symbols.json
index acd8a803c6..8e32f0334d 100644
--- a/packages/core/test/bundling/hello_world_r2/bundle.golden_symbols.json
+++ b/packages/core/test/bundling/hello_world_r2/bundle.golden_symbols.json
@@ -3134,9 +3134,6 @@
   {
     "name": "isIdentifierStart"
   },
-  {
-    "name": "isInteropObservable"
-  },
   {
     "name": "isIterable"
   },
@@ -3170,6 +3167,9 @@
   {
     "name": "isObject"
   },
+  {
+    "name": "isObservable"
+  },
   {
     "name": "isPrefixEnd"
   },
@@ -3839,4 +3839,4 @@
   {
     "name": "wtfLeave"
   }
-]
+]
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 88c7dd25a2..abadcdb24f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6066,8 +6066,8 @@ rollup@0.47.4:
   resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.47.4.tgz#e3a55de83a78221d232ce29619a8d68189ae845e"
 
 rxjs@^6.0.0:
-  version "6.2.1"
-  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-6.2.1.tgz#246cebec189a6cbc143a3ef9f62d6f4c91813ca1"
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-6.0.0.tgz#d647e029b5854617f994c82fe57a4c6747b352da"
   dependencies:
     tslib "^1.9.0"