Leveraging vuex in conjunction with typescript allows for efficient management of state in namespace modules,

I am currently integrating vuex with typescript and namespaces module in my project. Within this setup, I have two distinct modules: "UserProfile" and "Trips". So far, everything is functioning smoothly within the confines of each module.

However, I have encountered an issue where I need to access the current user data, stored within the state of the "UserProfile" module, from an action within the "Trip" module.

My understanding suggests that I could simply use rootState["profile/user"] if I were not using typescript.

Nevertheless, when working with typescript, the compiler presents me with an error message like the following:

Element implicitly has an 'any' type because type 'RootState' has no index signature.

Here is a snippet of the problematic action within the "Trip" module:

async createTrip({ commit, state, rootState, rootGetters}) {
    const user = rootState["profile/user"];
}

If anyone knows the correct method to access a state belonging to another namespaced module while utilizing vuex + typescript, your help would be greatly appreciated.

Thank you.

===== UPDATE =====

After some experimentation, I have come across a workaround that seems to be effective:

1] For each module, creating a getter that returns its entire state (for example, the "Profile" module includes a getter for the ProfileState type).

2] Utilizing this getter through rootGetters from another module as demonstrated below:

 async createTrip({ commit, state, rootState, rootGetters}) {
    const profileState: ProfileState= rootGetters["profile/getState"];
    if(profileState.user === undefined ) return;
    console.log("CurrentUser: " + profileState.user.uid);
}

Answer №1

When using typescript, the compiler may show an error similar to this:

The element implicitly has an 'any' type because the type 'RootState' does not have an index signature.

This error indicates that in your type declaration, you have forgotten to include a definition such as:

For example:

export type RootState = {
  //...
  profile?: ProfileState
}

or

export type RootState = {
  //...
  [k in keyof ModuleStateTypes]?: ModuleStateTypes[k] 
}

Mapped types

Answer №2

What if we were to consider including these modules within the rootState type definition?

{ ...; moduleName?: moduleState;}

We could also explore the option of:

{ ...; [key: string | number]: any;}

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