diff --git a/src/index.ts b/src/index.ts
index d937961..5a7a53a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,10 +1,5 @@
 // import { isNodeSimple } from './utils';
-
-export interface FiberNode {
-  child: FiberNode | null;
-  sibling: FiberNode | null;
-  // Add type
-}
+import {FiberNode} from './mocked-types';
 
 function traverse(node: FiberNode, fn: (node: FiberNode) => any) {
   // if (node.child) {
diff --git a/src/mocked-types/index.ts b/src/mocked-types/index.ts
new file mode 100644
index 0000000..6807ae6
--- /dev/null
+++ b/src/mocked-types/index.ts
@@ -0,0 +1,5 @@
+export interface FiberNode {
+  child: FiberNode | null;
+  sibling: FiberNode | null;
+  // Add type
+}