diff --git a/src/databaseWorker.ts b/src/databaseWorker.ts
index 0e134fe..9f6342d 100644
--- a/src/databaseWorker.ts
+++ b/src/databaseWorker.ts
@@ -19,7 +19,7 @@ import { createWorkerEndpoint } from "./core/sqlite-db";
  */
 function log(level: 'log' | 'warn' | 'error', ...args: unknown[]) {
   if (parentPort) {
-    parentPort.postMessage({ kind: 'log', level, args: args.map(a => a instanceof Error ? a.message : a) });
+    parentPort.postMessage({ kind: 'log', level, args: args.map(a => a instanceof Error ? a.message : a) }, []);
   } else {
     console[level](...args);
   }
@@ -55,8 +55,12 @@ if (parentPort) {
     const wasHandled = processProtocolMessage(
       envelope,
       databaseEndpoint as Record<string, (...args: unknown[]) => unknown>,
-      (response, transfer) => {
-        parentPort!.postMessage(response, transfer);
+      (response, transfer?: Transferable[]) => {
+        if (transfer) {
+          parentPort!.postMessage(response, transfer as any[]);
+        } else {
+          parentPort!.postMessage(response, []);
+        }
       }
     );
 
diff --git a/src/platform/threadPool.ts b/src/platform/threadPool.ts
index 94596a5..2ffc67c 100644
--- a/src/platform/threadPool.ts
+++ b/src/platform/threadPool.ts
@@ -9,6 +9,8 @@
  * all VS Code runtime environments without conditional imports.
  */
 
+import type * as wt from 'worker_threads';
+
 // ============================================================================
 // Type Definitions for Cross-Platform Message Passing
 // ============================================================================
@@ -18,7 +20,7 @@
  * Used for communication in Node.js worker_threads.
  */
 interface NodeMessagePort {
-  postMessage(data: unknown, transfer?: unknown[]): void;
+  postMessage(data: unknown, transfer?: any[]): void;
   on(event: string, handler: EventListenerOrEventListenerObject, options?: object): void;
   off(event: string, handler: EventListenerOrEventListenerObject, options?: object): void;
 }
@@ -84,11 +86,11 @@ export function createBrowserParentPort(scope: BrowserParentPortScope): NodeMess
 // Runtime Detection and API Export
 // ============================================================================
 
-let WorkerImpl: any;
-let MessageChannelImpl: any;
-let MessagePortImpl: any;
-let BroadcastChannelImpl: any;
-let parentPortImpl: any;
+let WorkerImpl: typeof globalThis.Worker | typeof wt.Worker;
+let MessageChannelImpl: typeof globalThis.MessageChannel | typeof wt.MessageChannel;
+let MessagePortImpl: typeof globalThis.MessagePort | typeof wt.MessagePort;
+let BroadcastChannelImpl: typeof globalThis.BroadcastChannel | typeof wt.BroadcastChannel;
+let parentPortImpl: typeof wt.parentPort | NodeMessagePort | null;
 
 if (import.meta.env?.VSCODE_BROWSER_EXT) {
   WorkerImpl = globalThis.Worker;
diff --git a/src/workerFactory.ts b/src/workerFactory.ts
index e3696dc..65c47a1 100644
--- a/src/workerFactory.ts
+++ b/src/workerFactory.ts
@@ -328,7 +328,8 @@ async function createWorkerBackedWasmDatabaseConnection(
     {
       postMessage: (data: unknown, transfer?: Transferable[]) => {
         if (transfer) {
-          workerThread.postMessage(data, transfer);
+          // worker_threads.Worker postMessage needs TransferListItem[], but we can pass it via any if necessary or let it be inferred if we cast it. Transferable in DOM is ArrayBuffer | MessagePort | ImageBitmap, which intersects with node's TransferListItem (ArrayBuffer | MessagePort | FileHandle | X509Certificate | Blob) at ArrayBuffer and MessagePort.
+          workerThread.postMessage(data, transfer as any);
         } else {
           workerThread.postMessage(data);
         }