Fix RelayObservable ifEmpty: Cannot access 'current' before initializ…

…ation Reviewed By: alunyov Differential Revision: D49214158 fbshipit-source-id: 38eb9b75eed5aed34aadaf183887e9a46e033fe1
facebook · Sep 14, 2023 · 33d5475 · 33d5475
1 parent 38a08ed
commit 33d5475
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/packages/relay-runtime/network/RelayObservable.js b/packages/relay-runtime/network/RelayObservable.js
@@ -272,7 +272,8 @@ class RelayObservable<+T> implements Subscribable<T> {
   ifEmpty<U>(alternate: RelayObservable<U>): RelayObservable<T | U> {
     return RelayObservable.create(sink => {
       let hasValue = false;
-      let current: Subscription = this.subscribe({
+      let current: ?Subscription;
+      current = this.subscribe({
         next(value) {
           hasValue = true;
           sink.next(value);
@@ -287,7 +288,7 @@ class RelayObservable<+T> implements Subscribable<T> {
         },
       });
       return () => {
-        current.unsubscribe();
+        current && current.unsubscribe();
       };
     });
   }