diff --git a/sdk/ts/src/abstractServerSentEventGenerator.ts b/sdk/ts/src/abstractServerSentEventGenerator.ts
index 94d9e1a86..e4c423084 100644
--- a/sdk/ts/src/abstractServerSentEventGenerator.ts
+++ b/sdk/ts/src/abstractServerSentEventGenerator.ts
@@ -9,7 +9,7 @@ import {
 
 import { DefaultSseRetryDurationMs } from "./consts.ts";
 
-import { Jsonifiable } from "type-fest";
+import type { Jsonifiable } from "npm:type-fest";
 
 /**
  * Abstract ServerSentEventGenerator class, responsible for initializing and handling
diff --git a/sdk/ts/src/node/node.ts b/sdk/ts/src/node/node.ts
index ba3ad533a..b7ed02e9f 100644
--- a/sdk/ts/src/node/node.ts
+++ b/sdk/ts/src/node/node.ts
@@ -1,6 +1,6 @@
 import { createServer } from "node:http";
 import { ServerSentEventGenerator } from "./serverSentEventGenerator.ts";
-import { Jsonifiable } from "type-fest";
+import type { Jsonifiable } from "npm:type-fest";
 
 const hostname = "127.0.0.1";
 const port = 3000;
diff --git a/sdk/ts/src/node/serverSentEventGenerator.ts b/sdk/ts/src/node/serverSentEventGenerator.ts
index b961ba4f1..aba94deaa 100644
--- a/sdk/ts/src/node/serverSentEventGenerator.ts
+++ b/sdk/ts/src/node/serverSentEventGenerator.ts
@@ -4,6 +4,7 @@ import { ServerSentEventGenerator as AbstractSSEGenerator } from "../abstractSer
 
 import { IncomingMessage, ServerResponse } from "node:http";
 import process from "node:process";
+import type { Jsonifiable } from "npm:type-fest";
 
 function isRecord(obj: unknown): obj is Record<string, unknown> {
   return typeof obj === "object" && obj !== null;
@@ -69,7 +70,7 @@ export class ServerSentEventGenerator extends AbstractSSEGenerator {
    * @returns An object containing a success boolean and either the client's signals or an error message.
    */
   static async readSignals(request: IncomingMessage): Promise<
-    | { success: true; signals: Record<string, unknown> }
+    | { success: true; signals: Record<string, Jsonifiable> }
     | { success: false; error: string }
   > {
     if (request.method === "GET") {
diff --git a/sdk/ts/src/types.ts b/sdk/ts/src/types.ts
index 4e6667c22..58aeb884b 100644
--- a/sdk/ts/src/types.ts
+++ b/sdk/ts/src/types.ts
@@ -13,7 +13,7 @@ import {
   EventTypes,
   FragmentMergeModes,
 } from "./consts.ts";
-import { Jsonifiable } from "type-fest";
+import type { Jsonifiable } from "npm:type-fest";
 
 export type FragmentMergeMode = typeof FragmentMergeModes[number];
 export type EventType = typeof EventTypes[number];
diff --git a/sdk/ts/src/web/deno.ts b/sdk/ts/src/web/deno.ts
index 14cc11583..55f075bd0 100644
--- a/sdk/ts/src/web/deno.ts
+++ b/sdk/ts/src/web/deno.ts
@@ -1,6 +1,6 @@
 import { serve } from "https://deno.land/std@0.140.0/http/server.ts";
 import { ServerSentEventGenerator } from "./serverSentEventGenerator.ts";
-import { Jsonifiable } from "type-fest";
+import type { Jsonifiable } from "npm:type-fest";
 
 serve(async (req: Request) => {
   const url = new URL(req.url);
diff --git a/sdk/ts/src/web/serverSentEventGenerator.ts b/sdk/ts/src/web/serverSentEventGenerator.ts
index c8dcd5d3a..1029fa10a 100644
--- a/sdk/ts/src/web/serverSentEventGenerator.ts
+++ b/sdk/ts/src/web/serverSentEventGenerator.ts
@@ -63,7 +63,7 @@ export class ServerSentEventGenerator extends AbstractSSEGenerator {
    * @returns An object containing a success boolean and either the client's signals or an error message.
    */
   static async readSignals(request: Request): Promise<
-    | { success: true; signals: Record<string, unknown> }
+    | { success: true; signals: Record<string, Jsonifiable> }
     | { success: false; error: string }
   > {
     try {