From 223c00e35809831076b5f4fb0021c65f2b6db73c Mon Sep 17 00:00:00 2001
From: ktsn <ktsn55@gmail.com>
Date: Thu, 11 Jan 2018 23:45:07 +0900
Subject: [PATCH] fix(types): allow a function type for root `state` option

---
 types/index.d.ts    | 2 +-
 types/test/index.ts | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/types/index.d.ts b/types/index.d.ts
index 70da30c1e..4c029ccdb 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -77,7 +77,7 @@ export interface CommitOptions {
 }
 
 export interface StoreOptions<S> {
-  state?: S;
+  state?: S | (() => S);
   getters?: GetterTree<S, S>;
   actions?: ActionTree<S, S>;
   mutations?: MutationTree<S>;
diff --git a/types/test/index.ts b/types/test/index.ts
index 0253e5df8..4a985926b 100644
--- a/types/test/index.ts
+++ b/types/test/index.ts
@@ -96,6 +96,15 @@ namespace RootDefaultModule {
   });
 }
 
+namespace InitialStateFunction {
+  const store = new Vuex.Store({
+    state: () => ({
+      value: 1
+    })
+  });
+  const n: number = store.state.value;
+}
+
 namespace NestedModules {
   interface RootState {
     a: {