Using Typescript to define Vuex store types

Question

Using Typescript to define Vuex store types

Attempting to create a TypeScript-friendly Vuex store has been quite the challenge. Following instructions outlined here, I've encountered an issue where accessing this.$store from a component results in a type of Store<any>.

I'm struggling to find a way to make it default to Store<MyState> without needing to cast it every single time.

typescript vue.js vuex

Answer 1

Answer №1

Regrettably, it is not feasible to replace the existing Store<any> type defined by VueX with a more specific type. One workaround is to introduce a secondary field that provides a properly typed $store, eliminating the need for constant casts or declarations in all components:

import { Store } from "vuex";

// Define $tstore with proper typing equivalent to $store.
// It's impossible to directly override the Store<any> type.
declare module "vue/types/vue" {
  interface Vue {
    $tstore: Store<State>;
  }
}

// Assign $tstore as a getter that returns $store.
Object.defineProperty(Vue.prototype, "$tstore", {
  get: function() {
    return this.$store as Store<State>;
  },
  enumerable: true,
});

Answer 2

Regrettably, it is not feasible to replace the existing Store<any> type defined by VueX with a more specific type. One workaround is to introduce a secondary field that provides a properly typed $store, eliminating the need for constant casts or declarations in all components:

import { Store } from "vuex";

// Define $tstore with proper typing equivalent to $store.
// It's impossible to directly override the Store<any> type.
declare module "vue/types/vue" {
  interface Vue {
    $tstore: Store<State>;
  }
}

// Assign $tstore as a getter that returns $store.
Object.defineProperty(Vue.prototype, "$tstore", {
  get: function() {
    return this.$store as Store<State>;
  },
  enumerable: true,
});

Answer 3

Answer №2

If you happen to stumble upon this - we managed to resolve the issue by defining a new type for the constructor's return value -

import Vue, { VueConstructor } from 'vue'
import { Store } from 'vuex'
import { RootState } from '@/store/types'

abstract class CustomVueClass extends Vue {
    public $store!: Store<RootState>
}
const CustomVue = Vue as VueConstructor<CustomVueClass>;

export default CustomVue;

and then simply

export default CustomVue.extend({
    name: 'name',

    components: {
        componentA,
        componentB,
},

this enables us to correctly implement typing:

methods: {
sessionStarted(): Boolean | undefined {
    return this.$store.state.sessionState?.session.started;
},

Answer 4

If you happen to stumble upon this - we managed to resolve the issue by defining a new type for the constructor's return value -

import Vue, { VueConstructor } from 'vue'
import { Store } from 'vuex'
import { RootState } from '@/store/types'

abstract class CustomVueClass extends Vue {
    public $store!: Store<RootState>
}
const CustomVue = Vue as VueConstructor<CustomVueClass>;

export default CustomVue;

and then simply

export default CustomVue.extend({
    name: 'name',

    components: {
        componentA,
        componentB,
},

this enables us to correctly implement typing:

methods: {
sessionStarted(): Boolean | undefined {
    return this.$store.state.sessionState?.session.started;
},

Answer 5

Answer №3

If you want to ensure typing in your Vue component, one handy way is to declare a property and use the ! operator to let TypeScript know that Vue will handle setting the variable for you. This technique works well with both $refs and $store.

$store!: Store<StoreStateType>;

Another approach is to utilize the MapState or MapGetters component helpers provided by Vuex. These helpers automatically create properties that you can directly use in your template. Here's an example:

@Component({
  computed: mapState({
    userFullName: (state: any) => state.user.fullName,
    userEmail: (state: any) => state.user.email
  })
})

Remember to import necessary dependencies like Store, your Vuex state class, and any helper functions using

import { Store, mapState } from "vuex";

.

Answer 6

If you want to ensure typing in your Vue component, one handy way is to declare a property and use the ! operator to let TypeScript know that Vue will handle setting the variable for you. This technique works well with both $refs and $store.

$store!: Store<StoreStateType>;

Another approach is to utilize the MapState or MapGetters component helpers provided by Vuex. These helpers automatically create properties that you can directly use in your template. Here's an example:

@Component({
  computed: mapState({
    userFullName: (state: any) => state.user.fullName,
    userEmail: (state: any) => state.user.email
  })
})

Remember to import necessary dependencies like Store, your Vuex state class, and any helper functions using

import { Store, mapState } from "vuex";

.

Answer 7

Answer №4

I was unable to find a satisfactory answer, so I took matters into my own hands and stumbled upon a fantastic solution. Inside my store.ts file, I simply inserted the following:

declare module "@vue/runtime-core" {
  interface ComponentCustomProperties {
    $store: Store<State>;
  }
}

This snippet transforms the code in this manner:

//store.ts
import { createStore, Store } from "vuex";
import { CustomTool, CustomListType } from "custom";

export type State = {
  tool: CustomTool
  list: CustomListType | null
};

export default createStore({
  state: {
    tool: CustomTool.Empty
    list: null,
  } as State,
  mutations: {},
  actions: {},
  modules: {}
};

declare module "@vue/runtime-core" {
  interface ComponentCustomProperties {
    $store: Store<State>;
  }
}

This solution works perfectly with vue3 and typescript 4.4.

Answer 8

I was unable to find a satisfactory answer, so I took matters into my own hands and stumbled upon a fantastic solution. Inside my store.ts file, I simply inserted the following:

declare module "@vue/runtime-core" {
  interface ComponentCustomProperties {
    $store: Store<State>;
  }
}

This snippet transforms the code in this manner:

//store.ts
import { createStore, Store } from "vuex";
import { CustomTool, CustomListType } from "custom";

export type State = {
  tool: CustomTool
  list: CustomListType | null
};

export default createStore({
  state: {
    tool: CustomTool.Empty
    list: null,
  } as State,
  mutations: {},
  actions: {},
  modules: {}
};

declare module "@vue/runtime-core" {
  interface ComponentCustomProperties {
    $store: Store<State>;
  }
}

This solution works perfectly with vue3 and typescript 4.4.

Using Typescript to define Vuex store types

Answer №1

Answer №2

Answer №3

Answer №4

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