diff --git a/browser.d.ts b/browser.d.ts
index f19ebc4..a69e460 100644
--- a/browser.d.ts
+++ b/browser.d.ts
@@ -6,6 +6,7 @@ import {
   StackFrame,
   Transport,
 } from '@sentry/types'
+import { V6TransportClass, V7TransportFunction } from "./index";
 
 export = sentryTestkit
 
@@ -64,11 +65,15 @@ declare namespace sentryTestkit {
     isExist(e: Error): boolean
   }
 
-  export interface TestkitResult {
+  type V6TransportClass = {
+    new(): Transport
+  }
+
+  type V7TransportFunction = () => Transport
+
+  export interface TestkitResult<Transport extends V6TransportClass | V7TransportFunction> {
     testkit: Testkit
-    sentryTransport: {
-      new (): Transport
-    }
+    sentryTransport: Transport
     initNetworkInterceptor<T>(
       dsn: string,
       initCallback: (
diff --git a/index.d.ts b/index.d.ts
index ac788e0..3536bd3 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -70,11 +70,15 @@ declare namespace sentryTestkit {
     getDsn: () => string
   }
 
-  export interface TestkitResult {
+  type V6TransportClass = {
+    new(): Transport
+  }
+
+  type V7TransportFunction = () => Transport
+
+  export interface TestkitResult<Transport extends V6TransportClass | V7TransportFunction> {
     testkit: Testkit
-    sentryTransport: {
-      new (): Transport
-    }
+    sentryTransport: Transport
     initNetworkInterceptor<T>(
       dsn: string,
       initCallback: (