diff --git a/src/index.ts b/src/index.ts
index 9185589..00ec097 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -12,6 +12,7 @@ import {
 } from './main';
 import { SplitTest } from './splitTest';
 import { uiFactory } from './ui';
+import { UserSessionPersister } from './userSessionPersister';
 
 const ui = uiFactory(
     testsObservable,
@@ -47,6 +48,7 @@ export {
     reset,
     ui,
     SplitTest,
+    UserSessionPersister,
 };
 
 export default {
diff --git a/src/main.ts b/src/main.ts
index 773e7ad..dd4be4b 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -30,6 +30,9 @@ export function config(userConfig: Partial<Config> = {}) {
     if (userConfig.onVariationChange) {
         _config.onVariationChange = userConfig.onVariationChange;
     }
+    if (userConfig.sessionPersister) {
+        _config.sessionPersister = userConfig.sessionPersister;
+    }
 }
 
 /**