fix(electron): type on handlers (#3747)

apps/electron/src/helper/db/base-db-adapter.ts

@@ -44,10 +44,10 @@ export abstract class BaseSQLiteAdapter {
     try {
       if (!this.db) {
         logger.warn(`${this.path} is not connected`);
-        return;
+        return null;
       }
       const blob = await this.db.getBlob(key);
-      return blob?.data;
+      return blob?.data ?? null;
     } catch (error) {
       logger.error('getBlob', error);
       return null;

apps/electron/src/helper/db/workspace-db-adapter.ts

@@ -128,7 +128,7 @@ export class WorkspaceSQLiteDB extends BaseSQLiteAdapter {
     if (doc) {
       return encodeStateAsUpdate(doc);
     }
-    return null;
+    return false;
   };
 
   // non-blocking and use yDoc to validate the update