diff --git a/src/vanilla/store2.ts b/src/vanilla/store2.ts
index 4115aca4a9..2f3c12e5cd 100644
--- a/src/vanilla/store2.ts
+++ b/src/vanilla/store2.ts
@@ -258,6 +258,9 @@ type PrdStore = {
 }
 type Store = PrdStore | (PrdStore & DevStoreRev4)
 
+export type INTERNAL_DevStoreRev4 = DevStoreRev4
+export type INTERNAL_PrdStore = PrdStore
+
 export const createStore = (): Store => {
   const atomStateMap = new WeakMap<AnyAtom, AtomState>()