Small improvements:

- Switch to CodeMirror
- Switch to Parcel Bundler
- Fix synchronisation bug
- Update dependencies

src/hooks.ts

@@ -0,0 +1,23 @@
+import { useEffect, useMemo, useState } from "preact/hooks";
+
+export function usePromise<T>(promiseFnc: () => Promise<T>, params: any[]) {
+   const promise = useMemo(promiseFnc, params);
+   const [loading, setLoading] = useState(true);
+   const [error, setError] = useState(undefined);
+   const [value, setValue] = useState(undefined);
+
+   useEffect(() => {
+      let canceled = false;
+
+      promise
+         .then((res) => setValue(res))
+         .catch((err) => setError(err))
+         .finally(() => setLoading(false));
+
+      return () => {
+         canceled = true;
+      };
+   }, [promise]);
+
+   return [loading, error, value];
+}