diff --git a/packages/web-worker/types/notifier.test.ts b/packages/web-worker/types/notifier.test.ts
new file mode 100644
index 0000000000..d86f3227f8
--- /dev/null
+++ b/packages/web-worker/types/notifier.test.ts
@@ -0,0 +1,24 @@
+import type { WorkerConfig } from './notifier';
+
+describe('WorkerConfig type', () => {
+  it('should allow apiKey and custom fields', () => {
+    // This should type-check without error
+    const config: WorkerConfig = {
+      apiKey: '123',
+      collectUserIp: true,
+      generateAnonymousId: false
+    };
+    expect(config.apiKey).toBe('123');
+    expect(config.collectUserIp).toBe(true);
+    expect(config.generateAnonymousId).toBe(false);
+  });
+
+  it('should error if apiKey is missing', () => {
+    // @ts-expect-error: apiKey is required
+    const config: WorkerConfig = {
+      collectUserIp: true,
+      generateAnonymousId: false
+    };
+    expect(config).toBeDefined();
+  });
+});
diff --git a/packages/web-worker/types/notifier.ts b/packages/web-worker/types/notifier.ts
index d0d61870ae..484e788631 100644
--- a/packages/web-worker/types/notifier.ts
+++ b/packages/web-worker/types/notifier.ts
@@ -14,4 +14,4 @@ declare const Bugsnag: WorkerBugsnagStatic
 
 export default Bugsnag
 export * from '@bugsnag/core'
-export { WorkerConfig }
+export type { WorkerConfig }