refactor: Upgrade to TypeScript 5.9.2 (#17955)

packages/@n8n/nodes-langchain/utils/N8nBinaryLoader.ts

@@ -91,7 +91,7 @@ export class N8nBinaryLoader {
 			const binaryBuffer = await this.context.helpers.binaryToBuffer(
 				await this.context.helpers.getBinaryStream(binaryData.id),
 			);
-			return new Blob([binaryBuffer], {
+			return new Blob([binaryBuffer as BlobPart], {
 				type: mimeType,
 			});
 		} else {

packages/cli/src/chat/chat-service.ts

@@ -266,8 +266,9 @@ export class ChatService {
 	private stringifyRawData(data: RawData) {
 		const buffer = Array.isArray(data)
 			? Buffer.concat(data.map((chunk) => Buffer.from(chunk)))
-			: Buffer.from(data);
-
+			: data instanceof ArrayBuffer
+				? Buffer.from(data)
+				: data;
 		return buffer.toString('utf8');
 	}
 

packages/cli/src/push/websocket.push.ts

@@ -20,7 +20,12 @@ export class WebSocketPush extends AbstractPush<WebSocket> {
 
 		const onMessage = async (data: WebSocket.RawData) => {
 			try {
-				const buffer = Array.isArray(data) ? Buffer.concat(data) : Buffer.from(data);
+				const buffer = Array.isArray(data)
+					? Buffer.concat(data)
+					: data instanceof ArrayBuffer
+						? Buffer.from(data)
+						: data;
+
 				const msg: unknown = JSON.parse(buffer.toString('utf8'));
 
 				// Client sends application level heartbeat messages to react

packages/cli/src/task-runners/task-broker/task-broker-ws-server.ts

@@ -99,7 +99,11 @@ export class TaskBrokerWsServer {
 
 		const onMessage = async (data: WebSocket.RawData) => {
 			try {
-				const buffer = Array.isArray(data) ? Buffer.concat(data) : Buffer.from(data);
+				const buffer = Array.isArray(data)
+					? Buffer.concat(data)
+					: data instanceof ArrayBuffer
+						? Buffer.from(data)
+						: data;
 
 				const message: RunnerMessage.ToBroker.All = JSON.parse(
 					buffer.toString('utf8'),

pnpm-workspace.yaml

@@ -50,7 +50,7 @@ catalog:
   xss: 1.0.15
   zod: 3.25.67
   zod-to-json-schema: 3.23.3
-  typescript: 5.8.3
+  typescript: 5.9.2
   eslint: 9.29.0
 
 catalogs: