start packaging

packages/repl-react/useWebMidi.js

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+import { useEffect, useState } from 'react';
+
+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 };
+}