strudel-docker/repl/src/useWebMidi.js

import { useEffect, useState } from 'react';
import { WebMidi } from 'webmidi';
import { enableWebMidi } from '@strudel/midi'

export function useWebMidi(props) {
  const { ready, connected, disconnected } = props;
  const [loading, setLoading] = useState(true);
  const [outputs, setOutputs] = useState(WebMidi?.outputs || []);
  useEffect(() => {
    enableWebMidi()
      .then(() => {
        // Reacting when a new device becomes available
        WebMidi.addListener('connected', (e) => {
          setOutputs([...WebMidi.outputs]);
          connected?.(WebMidi, e);
        });
        // Reacting when a device becomes unavailable
        WebMidi.addListener('disconnected', (e) => {
          setOutputs([...WebMidi.outputs]);
          disconnected?.(WebMidi, e);
        });
        ready?.(WebMidi);
        setLoading(false);
      })
      .catch((err) => {
        if (err) {
          //throw new Error("Web Midi could not be enabled...");
          console.warn('Web Midi could not be enabled..');
          return;
        }
      });
  }, [ready, connected, disconnected, outputs]);
  const outputByName = (name) => WebMidi.getOutputByName(name);
  return { loading, outputs, outputByName };
}