Hi everyone,
Recently I was trying to show an alert if the ActionCable connection became
closed. I poked around the code and learned that there wasn't a great way
to hook into the events.
I ended up polling the connection status with:
```
setInterval( () => { if (App.cable.connection.getStatus() === "closed") {
callSideEffectCode() } }, 5000)
```
But I'd rather have been able to just write something like:
```
App.cable.customHandler["closed"] = callSideEffectCode
```
Would people be interested in a feature that adds support for custom
callbacks for the 4 types of WebSocket events that ActionCable.Connection
handles? I think it'd be a very small PR.
thanks,
Dan
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