refactor: remove null type in hooks (#1955)

packages/workspace/src/providers/index.ts

@@ -109,7 +109,10 @@ const createIndexedDBProvider = (
   const callbacks = new CallbackSet();
   return {
     flavour: 'local-indexeddb',
+    // fixme: remove callbacks
     callbacks,
+    // fixme: remove whenSynced
+    whenSynced: indexeddbProvider.whenSynced,
     // fixme: remove background long polling
     background: true,
     cleanup: () => {

packages/workspace/src/type.ts

@@ -32,6 +32,7 @@ export interface BroadCastChannelProvider extends BaseProvider {
 
 export interface LocalIndexedDBProvider extends BackgroundProvider {
   flavour: 'local-indexeddb';
+  whenSynced: Promise<void>;
 }
 
 export interface AffineWebSocketProvider extends BaseProvider {