export reset id function

src/index.ts

@@ -1,5 +1,5 @@
-import snapshot, { serializeNodeWithId } from './snapshot';
+import snapshot, { serializeNodeWithId, resetId } from './snapshot';
 import rebuild from './rebuild';
 export * from './types';
 
-export { snapshot, serializeNodeWithId, rebuild };
+export { snapshot, serializeNodeWithId, resetId, rebuild };

src/snapshot.ts

@@ -13,7 +13,7 @@ function genId(): number {
   return _id++;
 }
 
-function resetId() {
+export function resetId() {
   _id = 1;
 }