Node-RED

Runtime hooks engine

The following hooks can be used:

Message sending

onSend - passed an array of SendEvent objects. The messages inside these objects are exactly what the node has passed to node.send - meaning there could be duplicate references to the same message object.
preRoute - passed a SendEvent
preDeliver - passed a SendEvent. The local router has identified the node it is going to send to. At this point, the message has been cloned if needed.
postDeliver - passed a SendEvent. The message has been dispatched to be delivered asynchronously (unless the sync delivery flag is set, in which case it would be continue as synchronous delivery)
onReceive - passed a ReceiveEvent when a node is about to receive a message
postReceive - passed a ReceiveEvent when the message has been given to the node's input handler(s)
onComplete - passed a CompleteEvent when the node has completed with a message or logged an error

Name	Type	Description
`hookId`	`String`	the name of the hook to attach to
`callback`	`function`	the callback function for the hook

Remove a handled from a named hook

Name	Type	Description
`hookId`	`String`	the name of the hook event to remove - must be `name.label`

@node-red/runtime.hooks