VueX Vue: Could not find a declaration file for module vuex.

vuex4.0.2 webstorm報如下錯誤
Vue: Could not find a declaration file for module vuex.


解決辦法
在src目錄下新建一個vuex.d.ts
檔案內容如下

declare module "vuex" {
    export * from "vuex/types/index.d.ts";
    export * from "vuex/types/helpers.d.ts";
    export * from "vuex/types/logger.d.ts";
    export * from "vuex/types/vue.d.ts";
}

再回來，就不會報錯了