diff --git a/index.d.ts b/index.d.ts
index c1f2b70..691facb 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -93,7 +93,7 @@ declare class ThreadStream extends EventEmitter {
    * @param transferList an optional list of transferable objects to be transferred to the Worker context.
    * @returns {boolean} true if the event had listeners, false otherwise.
    */
-  emit(eventName: 'message', message: any, transferList?: workerThreads.TransferListItem[]): boolean
+  emit(eventName: 'message', message: any, transferList?: workerThreads.Transferable[]): boolean
 }
 
 export = ThreadStream;
diff --git a/package.json b/package.json
index 73fb9ef..c2f9fa3 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "real-require": "^1.0.0"
   },
   "devDependencies": {
-    "@types/node": "^25.0.2",
+    "@types/node": "^26.1.1",
     "@yao-pkg/pkg": "^6.0.0",
     "borp": "^1.0.0",
     "desm": "^1.3.0",
@@ -21,16 +21,21 @@
     "pino-elasticsearch": "^9.0.0",
     "sonic-boom": "^5.0.0",
     "ts-node": "^10.8.0",
+    "tsd": "^0.33.0",
     "typescript": "~5.7.3"
   },
   "scripts": {
     "build": "tsc --noEmit",
     "lint": "eslint",
-    "test": "npm run lint && npm run build && npm run transpile && borp --pattern \"test/*.test.{js,mjs}\"",
-    "test:ci": "npm run lint && npm run transpile && borp --pattern \"test/*.test.{js,mjs}\"",
+    "test": "npm run lint && npm run build && npm run test:types && npm run transpile && borp --pattern \"test/*.test.{js,mjs}\"",
+    "test:ci": "npm run lint && npm run test:types && npm run transpile && borp --pattern \"test/*.test.{js,mjs}\"",
+    "test:types": "tsd",
     "test:yarn": "npm run transpile && borp --pattern \"test/*.test.js\"",
     "transpile": "sh ./test/ts/transpile.sh"
   },
+  "tsd": {
+    "directory": "test/types"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/mcollina/thread-stream.git"
diff --git a/test/types/index.test-d.ts b/test/types/index.test-d.ts
new file mode 100644
index 0000000..92508fb
--- /dev/null
+++ b/test/types/index.test-d.ts
@@ -0,0 +1,26 @@
+import { expectType } from "tsd";
+import { type Transferable, MessageChannel } from "worker_threads";
+import ThreadStream from "../../index";
+
+const stream = new ThreadStream({ filename: "./worker.js" });
+
+expectType<boolean>(stream.write("hello"));
+expectType<void>(stream.end());
+expectType<void>(stream.flush());
+expectType<void>(stream.flushSync());
+
+// emit overload for posting a message to the worker,
+// optionally with a list of transferable objects
+const { port1 } = new MessageChannel();
+expectType<boolean>(stream.emit("message", { foo: "bar" }));
+expectType<boolean>(stream.emit("message", { foo: "bar" }, [port1]));
+expectType<boolean>(stream.emit("message", "data", [new ArrayBuffer(8)]));
+
+// the transferList parameter of the 'message' overload must be Transferable[]
+// (Parameters<> resolves to the last overload, which is the 'message' one)
+expectType<Transferable[] | undefined>(
+  undefined as unknown as Parameters<ThreadStream["emit"]>[2],
+);
+
+// generic EventEmitter emit
+expectType<boolean>(stream.emit("drain"));