Delay node: flush=1 or flush=true creates an undefined message #5381
Description
Current Behavior
When using the delay node and setting the delay in an upstream node via msg.delay, the flush method will also output an undefined message along the regular flushed message. When using flush=1 the undefined message will be output after the given delay, when using flush=true it will be output immediately.
Expected Behavior
I expect the delay node to act the same way as when the delay is hardcoded within the node, I don't expect to see an undefined message.
Steps To Reproduce
See included flow.
Example flow
[{"id":"c8c2cede48e6910a","type":"inject","z":"f475c7bdad8617dd","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"},{"p":"delay","v":"5000","vt":"num"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":490,"y":120,"wires":[["ba99e75e564f9547"]]},{"id":"ba99e75e564f9547","type":"delay","z":"f475c7bdad8617dd","name":"","pauseType":"delayv","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"allowrate":false,"outputs":1,"x":740,"y":140,"wires":[["8fffa9562c2caaf9"]]},{"id":"8fffa9562c2caaf9","type":"debug","z":"f475c7bdad8617dd","name":"debug 1","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":900,"y":140,"wires":[]},{"id":"2231956c9c262985","type":"inject","z":"f475c7bdad8617dd","name":"flush = 1","props":[{"p":"flush","v":"1","vt":"num"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":480,"y":280,"wires":[["ba99e75e564f9547"]]},{"id":"ced8db797973cd24","type":"comment","z":"f475c7bdad8617dd","name":"1. Click inject node","info":"","x":490,"y":60,"wires":[]},{"id":"5caf1671c2ef6138","type":"comment","z":"f475c7bdad8617dd","name":"2. Flush before 5 seconds","info":"","x":510,"y":220,"wires":[]},{"id":"78bdbbc496119311","type":"comment","z":"f475c7bdad8617dd","name":"3. An undefined message will be sent after 4 seconds with flush=1 or immediatly with flush=true","info":"","x":730,"y":360,"wires":[]},{"id":"0d8e0b21a6750b06","type":"inject","z":"f475c7bdad8617dd","name":"flush = true","props":[{"p":"flush","v":"true","vt":"bool"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":480,"y":320,"wires":[["ba99e75e564f9547"]]}]
Environment
- Node-RED version: 4.1.2
- Node.js version: 24
- npm version:
- Platform/OS: MacOS
- Browser: Safari