fast: Emit error events on entity

At least on the web, emitting an error on fast will stop processing.
Unless there is an error event listener on it but adding error listener on all "plugins" is a bit cumbersome.
So let's always emit errors on entity instead.

packages/client-core/src/fast/fast.js

@@ -5,7 +5,7 @@ import SASLFactory from "saslmechanisms";
 
 const NS = "urn:xmpp:fast:0";
 
-export default function fast({ sasl2 }) {
+export default function fast({ sasl2, entity }) {
   const saslFactory = new SASLFactory();
 
   let token;
@@ -24,14 +24,14 @@ export default function fast({ sasl2 }) {
       try {
         await this.saveToken(token);
       } catch (err) {
-        fast.emit("error", err);
+        entity.emit("error", err);
       }
     },
     async fetch() {
       try {
         return this.fetchToken();
       } catch (err) {
-        fast.emit("error", err);
+        entity.emit("error", err);
       }
     },
     saslFactory,
@@ -68,7 +68,7 @@ export default function fast({ sasl2 }) {
         });
         return true;
       } catch (err) {
-        fast.emit("error", err);
+        entity.emit("error", err);
         return false;
       }
     },

packages/client/index.js

@@ -70,6 +70,7 @@ function client(options = {}) {
 
   const fast = _fast({
     sasl2,
+    entity,
   });
   sasl2.setup({ fast });