refactor: workspace provider (#2218)

packages/y-indexeddb/README.md

@@ -1,18 +1,24 @@
 # @toeverything/y-indexeddb
 
-> This package haven't been published yet.
-
 ## Usage
 
 ```ts
-import { createIndexedDBProvider } from '@toeverything/y-indexeddb';
+import { createIndexedDBProvider, downloadBinary } from '@toeverything/y-indexeddb';
 import * as Y from 'yjs';
 const yDoc = new Y.Doc();
 
+// sync yDoc with indexedDB
 const provider = createIndexedDBProvider('docName', yDoc);
 provider.connect();
 await provider.whenSynced.then(() => {
   console.log('synced');
   provider.disconnect();
 });
+
+// dowload binary data from indexedDB for once
+downloadBinary('docName').then(blob => {
+  if (blob !== false) {
+    Y.applyUpdate(yDoc, blob);
+  }
+});
 ```