How to use the webmidi.getOutputByName function in webmidi

setupPush () {
    const push = this;
    push.output = WebMidi.getOutputByName('Ableton Push 2 User Port');
    push.input = WebMidi.getInputByName('Ableton Push 2 User Port');
    if (!push.input || !push.output) {
      log('push not connected');
      push.emit('push:failed');
      return;
    }

    push.input.addListener('sysex', 'all', (e) => {
      log('sysex', e);
    });

    // Listen to control change message on all channels
    push.input.addListener('controlchange', 'all', (e) => {
      log('Received \'controlchange\' message.', e);
      if (e.controller) {
        const name = e.controller.name;

function midiOutOnChange(ev) {
            if (this.value !== 'No Output') {
                Instruments.mute(true, useChordsInstrument);
                midiOut = WebMidi.getOutputByName(this.value);
            }
            else {
                Instruments.mute(false, useChordsInstrument);
                midiOut = dummyMidiOut;
            }
            log.info('Selected MIDI out: ' + this.value);
        };

this._magenta.instances().forEach((instance) => {
					this._magenta.updatePort(WebMidi.getOutputByName(instance.portName()))
				})