Clear WebSocket event listeners on close. (#615)

* Clear WebSocket event listeners on close. * Changelog update Co-authored-by: hwillson <hugh@octonary.com>
apollographql · Aug 10, 2020 · 2e4bb91 · 2e4bb91
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,8 @@
 
 - Do not send GQL_STOP when unsubscribing after GQL_COMPLETE is received.  <br/>
   [@onhate](https://github.com/onhate) in [#775](https://github.com/apollographql/subscriptions-transport-ws/pull/775)
+- Clear WebSocket event listeners on close.  <br/>
+  [@tretne](https://github.com/tretne) in [#615](https://github.com/apollographql/subscriptions-transport-ws/pull/615)
 
 ### New Features
 

diff --git a/src/client.ts b/src/client.ts
@@ -167,6 +167,10 @@ export class SubscriptionClient {
       }
 
       this.client.close();
+      this.client.onopen = null;
+      this.client.onclose = null;
+      this.client.onerror = null;
+      this.client.onmessage = null;
       this.client = null;
       this.eventEmitter.emit('disconnected');