diff --git a/src/renderer/store/TimelineSpace/Contents/Search.js b/src/renderer/store/TimelineSpace/Contents/Search.js
deleted file mode 100644
index 9bead2c5..00000000
--- a/src/renderer/store/TimelineSpace/Contents/Search.js
+++ /dev/null
@@ -1,19 +0,0 @@
-import Account from './Search/Account'
-import Tag from './Search/Tag'
-import Toots from './Search/Toots'
-
-const Search = {
-  namespaced: true,
-  modules: { Account, Tag, Toots },
-  state: {
-    loading: false
-  },
-  mutations: {
-    changeLoading (state, loading) {
-      state.loading = loading
-    }
-  },
-  actions: {}
-}
-
-export default Search
diff --git a/src/renderer/store/TimelineSpace/Contents/Search.ts b/src/renderer/store/TimelineSpace/Contents/Search.ts
new file mode 100644
index 00000000..228f5da0
--- /dev/null
+++ b/src/renderer/store/TimelineSpace/Contents/Search.ts
@@ -0,0 +1,35 @@
+import Account from './Search/Account'
+import Tag from './Search/Tag'
+import Toots from './Search/Toots'
+import { Module, MutationTree } from 'vuex'
+import { RootState } from '@/store'
+
+export interface SearchState {
+  loading: boolean
+}
+
+export interface SearchModuleState extends SearchState {
+}
+
+const state = (): SearchState => ({
+  loading: false
+})
+
+export const MUTATION_TYPES = {
+  CHANGE_LOADING: 'changeLoading'
+}
+
+const mutations: MutationTree<SearchState> = {
+  [MUTATION_TYPES.CHANGE_LOADING]: (state, loading: boolean) => {
+    state.loading = loading
+  }
+}
+
+const Search: Module<SearchState, RootState> = {
+  namespaced: true,
+  modules: { Account, Tag, Toots },
+  state: state,
+  mutations: mutations
+}
+
+export default Search