From ed8d77157868a681e1e3416e9b13b09052f1b6f7 Mon Sep 17 00:00:00 2001
From: Nicholas Jamieson <nicholas@cartant.com>
Date: Sat, 27 Apr 2019 08:31:51 +1000
Subject: [PATCH] fix(fromFetch): don't abort if fetch resolves

Closes #4739
---
 src/internal/observable/dom/fetch.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/internal/observable/dom/fetch.ts b/src/internal/observable/dom/fetch.ts
index 3513ea0803..22953d9767 100644
--- a/src/internal/observable/dom/fetch.ts
+++ b/src/internal/observable/dom/fetch.ts
@@ -55,6 +55,7 @@ export function fromFetch(input: string | Request, init?: RequestInit): Observab
     const controller = new AbortController();
     const signal = controller.signal;
     let outerSignalHandler: () => void;
+    let abortable = true;
     let unsubscribed = false;
 
     if (init) {
@@ -73,9 +74,11 @@ export function fromFetch(input: string | Request, init?: RequestInit): Observab
     }
 
     fetch(input, init).then(response => {
+      abortable = false;
       subscriber.next(response);
       subscriber.complete();
     }).catch(err => {
+      abortable = false;
       if (!unsubscribed) {
         // Only forward the error if it wasn't an abort.
         subscriber.error(err);
@@ -84,7 +87,9 @@ export function fromFetch(input: string | Request, init?: RequestInit): Observab
 
     return () => {
       unsubscribed = true;
-      controller.abort();
+      if (abortable) {
+        controller.abort();
+      }
     };
   });
 }