fix: convert Buffer to Uint8Array for browser hydration compatibility

The workflow web inspect now performs client-side hydration using
hydrateData() from @workflow/core/serialization-format. This function
checks for Uint8Array using instanceof, which fails for Buffer in the
browser since Buffer doesn't exist in browser environments.

This fix ensures that MongoDB Binary data is converted to true Uint8Array
before being returned, enabling proper data hydration in workflow web inspect.

Changes:
- Add bufferToUint8Array() helper function
- Update stripUndefined() to convert Buffer/Binary to Uint8Array
- Update cleanMongoDoc() to convert Buffer/Binary to Uint8Array
- Update dependencies to latest workflow versions

Signed-off-by: Assistant <assistant@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: boomyao

packages/mongodb/package.json

@@ -29,8 +29,8 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "@workflow/errors": "4.1.0-beta.14",
-    "@workflow/world": "4.1.0-beta.2",
+    "@workflow/errors": "4.1.0-beta.16",
+    "@workflow/world": "4.1.0-beta.6",
     "@vercel/queue": "^0.0.0-alpha.29",
     "mongodb": "^6.0.0",
     "ulid": "^2.3.0",
@@ -39,7 +39,7 @@
   "devDependencies": {
     "@testcontainers/mongodb": "^10.0.0",
     "@types/node": "^22.0.0",
-    "@workflow/world-testing": "4.1.0-beta.54",
+    "@workflow/world-testing": "4.1.0-beta.60",
     "@workflow-worlds/testing": "workspace:*",
     "typescript": "^5.7.0",
     "vitest": "^3.0.0"

packages/mongodb/src/storage.ts

@@ -81,11 +81,24 @@ function isMongoDuplicateKeyError(error: unknown): boolean {
   );
 }
 
+function bufferToUint8Array(buffer: Buffer): Uint8Array {
+  // Create a new Uint8Array that shares the same underlying ArrayBuffer
+  // This ensures the result is a true Uint8Array, not a Buffer
+  return new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength);
+}
+
 function stripUndefined<T>(doc: T): T {
   if (doc === null || doc === undefined) return doc;
   if (typeof doc !== 'object') return doc;
+  // Check for MongoDB Binary type first (has _bsontype marker)
+  if (isMongoBinaryLike(doc)) {
+    return bufferToUint8Array(doc.value()) as T;
+  }
+  // Convert Buffer to Uint8Array for browser compatibility
+  if (Buffer.isBuffer(doc)) {
+    return bufferToUint8Array(doc) as T;
+  }
   if (ArrayBuffer.isView(doc)) return doc;
-  if (isMongoBinaryLike(doc)) return doc.value() as T;
   if (Array.isArray(doc)) return doc.map(stripUndefined) as T;
   if (doc instanceof Date) return doc as T;
 
@@ -103,8 +116,15 @@ function stripUndefined<T>(doc: T): T {
 function cleanMongoDoc<T>(doc: T): T {
   if (doc === null || doc === undefined) return doc;
   if (typeof doc !== 'object') return doc;
+  // Check for MongoDB Binary type first (has _bsontype marker)
+  if (isMongoBinaryLike(doc)) {
+    return bufferToUint8Array(doc.value()) as T;
+  }
+  // Convert Buffer to Uint8Array for browser compatibility
+  if (Buffer.isBuffer(doc)) {
+    return bufferToUint8Array(doc) as T;
+  }
   if (ArrayBuffer.isView(doc)) return doc;
-  if (isMongoBinaryLike(doc)) return doc.value() as T;
   if (Array.isArray(doc)) return doc.map(cleanMongoDoc) as T;
   if (doc instanceof Date) return doc;