Dumb question about editing a node

add debugger key word into your node, restart node-red, open the browser & devtools, give it a go. Y

As i said earlier, I've not used it but i suspect it will fire when deleted from the editor (before deploy - so in other words, still active in the runtime).

If you want to remove callbacks at the server side, I would suggest you need to use this.on('close' and its parameters to determine if there is a clean up (at server side) to do.

reference

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