[2102] How to extract common mutations between modules?

I have some store modules that have some similar mutations . So, I decide to extract it to mutations.js But, I don't know how to load it in nuxt. simple import seems fail Here's the directories

store/
---common/
------mutations.js
---module1.js
---module2.js

Here's how I import it in module1.js

import mutations from './common/mutations'