How do I retype an interface from a dependency?

It's difficult to put into words, so I have created a repository for reference: https://github.com/galenyuan/how-to-retyping

My goal is to achieve the following:

import Vue from 'vue'

declare module 'vuex/types/vue' {
  interface Vue {
    $store: number
  }
}

In this code snippet, Vue is defined in vue/types/vue and vuex modifies it in vuex/types/vue. How can I customize it further?

Answer №1

Initially, it is essential that all module extensions are directed towards the specific module defining what is being extended. This concept is exemplified in the augmentation of the vuex module itself.

// vuex/types/vue.d.ts
declare module "vue/types/vue" {
  interface Vue {
    $store: Store<any>;
  }
}

Your approach must mirror this one. For instance, within your types/store.d.ts, the following structure would be appropriate:

export {} // ensuring file acts as a module

declare module "vue/types/vue" {
  interface Vue {
    $store: Store<any>;
  }
}

This implementation will function effectively as an extension for the Vue module. However, you may encounter another issue where modifications to variable declarations cause conflicts with existing types.

Inconsistent variable declarations have been identified. The variable '$store' has type 'Store' at `*****/how-to-retyping-master/node_modules/vuex/types/vue.d.ts 15:4, but here has type 'number'.

This conflict arises from limitations in declaration merging, specifically overlapping member declarations leading to conflicts.

Addressing this challenge proves tricky due to the import of "vuex" preventing exclusions on imported content, including augmentations. Potential solutions involve modifying the import path for "vuex", or implementing an ambient external module declaration to workaround the issues. However, these approaches necessitate extensive redeclarations in files such as "vuex/types/index.d.ts" and "vuex/types/helpers.d.ts", making them impractical and difficult to maintain.

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