createStroe can't get the correct type if use the way of vuex's docs

[JiuRanYa]

sendbox: https://codesandbox.io/s/xenodochial-engelbart-w9ehy0?file=/src/main.ts

1. Now:

if you use createstore like vuex'doc in ts file, you can't get the correct type like this:

I checked the createstore's ts interface, it's an object:

so you need to write code like this in order to get the correct type:

2. expected: when you use the way of vuex's docs in ts, get the correct ts type;

3. How to solve the problem:

   • modify the vuex's docs
   • find some way to support the first way and get the correct ts type

I'd like to handle this issue

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