chore: use async/await in fromDataTransferItem

Author: rolandjitsu

src/file-selector.ts

@@ -105,7 +105,7 @@ function flatten<T>(items: any[]): T[] {
   );
 }
 
-function fromDataTransferItem(
+async function fromDataTransferItem(
   item: DataTransferItem,
   entry?: FileSystemEntry | null,
 ) {
@@ -118,18 +118,17 @@ function fromDataTransferItem(
     globalThis.isSecureContext &&
     typeof (item as any).getAsFileSystemHandle === "function"
   ) {
-    return (item as any).getAsFileSystemHandle().then(async (h: any) => {
-      const file = await h.getFile();
-      file.handle = h;
-      return toFileWithPath(file);
-    });
+    const h = await (item as any).getAsFileSystemHandle();
+    const file = await h.getFile();
+    file.handle = h;
+    return toFileWithPath(file);
   }
   const file = item.getAsFile();
   if (!file) {
-    return Promise.reject(`${item} is not a File`);
+    throw new Error(`${item} is not a File`);
   }
   const fwp = toFileWithPath(file, entry?.fullPath ?? undefined);
-  return Promise.resolve(fwp);
+  return fwp;
 }
 
 async function fromEntry(