UnhandledPromise Warning, SerialPort.list, no callback, return promise...

[epikao]

Hello, I'm new at JS, and Node, my goal is finally to provide an available Portlist to a combobox. But I'm already tumbling with below Code which does not work, and gives always follow error:
"UnhandledPromise...Warning:.... SerialPort.list no longer takes a callback.... only return a promise".

Unfortunately I have no idea, why this code should not work :-( ?

var SerialPort = require('serialport');
// callback approach
SerialPort.list(function (err, ports) {
  ports.forEach(function(port) {
    console.log(port.comName);
    console.log(port.pnpId);
    console.log(port.manufacturer);
  });
});

thanks

[reconbot]

If you're using serialport 8 as the error says "SerialPort.list no longer takes a callback and only returns a promise". You're providing a callback and not using the returned promise. Additionally comName has been renamed path. See the upgrade guide and the list() docs for other changes and examples.

You want to do;

const SerialPort = require('serialport');
// Promise approach
SerialPort.list().then(ports => {
  ports.forEach(function(port) {
    console.log(port.path);
    console.log(port.pnpId);
    console.log(port.manufacturer);
  });
});

Where did you find the example you're using?

[epikao]

thank you, that works now :-)
the example I found several time in the internet, for example stackoverflow etc...

[reconbot]

great!

[sagar-vandure]

great, thank you its help full to me to solve same error

[halilaykent]

2/6/2020, 21:23:56] Homebridge is running
g on port 51826.
Unhandled Rejection TypeError: Serialport
.list no longer takes a callback and only
returns a promise
at Function.SerialPort.list (/usr/loc
al/lib/node modules/homebridge-zigbee-v2/
node modules/@serialport/stream/lib/index
•js:651:11)
at /usr/local/lib/node_modules/homebrew
idge-zigbee-v2/lib/utils/findSerialPort.j

s:5:16

at new Promise ()
at find Serial Port (/usr/local/lib/node
e modules/homebridge-zigbee-v2/lib/utils/
findSerialPort.js:4:10),
at ZigBee Platform.start ZigBee (/usr/l
ocal/lib/node_modules/homebridge-zigbee-v
2/index.js:69:39)
at ZigBee Platform.handle Initialization
n (/usr/local/lib/node_modules/homebridge
-zigbee-v2/index.js:64:10)
at API.emit (events.js:223:5),
at Server.run(/usr/local/lib/node_mo
dules/homebridge/lib/server.js:103:13)
at module.exports (/usr/local/lib/node
node_modules/homebridge/lib/cli.js:59:10),
at Object. (/usr/local/lib
/node_modules/homebridge/bin/homebridge:1
7:22)