The function useNuxtApp() in Nuxt 3 is returning an unknown type

I have been working on creating a helper that can be used across all composables and applications in my Nuxt plugin. Here is how the code looks:

// hello.ts
export default defineNuxtPlugin(async nuxtApp => {

  nuxtApp.vueApp.provide('hello', (name: string) => `Hello ${name}!`);
  nuxtApp.provide('hello', (name: string) => `Hello ${name}!`)

});

After setting up the helper, I wanted to use it by calling useNuxtApp() in a composable as shown below, but encountered an issue with the return type being unknown.

// useHello.ts
export default async function() {
    const nuxtApp = useNuxtApp()
    console.log(nuxtApp.$hello('name'))
}

The error message states that nuxtApp.$hello is of type 'unknown'.

Despite following the documentation, I am confused as to why it is returning an unknown type.

Could there be something missing in my nuxt.config.ts file?

Your assistance on this matter would be greatly appreciated.

Answer №1

Following the update to VsCode 1.79, an error has emerged that is directly tied to the TypeScript version being used.

Post 1.79 upgrade, the TypeScript version has been updated and "Volar" now utilizes this new TypeScript version. To resolve this issue, simply press Ctrl + Shift + p, enter "Select TypeScript Version", and opt for "Use workspace version".

Answer №2

In my situation, I developed an interface for my custom plugin. Specifically, I crafted the NuxtApp module interface that integrates with my injected plugin interface.

Here's a snippet of what it looks like:

// plugins/api.ts

interface IApi {
  baseURL: string;
  auth: AuthModule;
  ...
}

declare module "#app" {
  interface NuxtApp {
    $api: IApi;
  }
}

export default defineNuxtPlugin((nuxtApp) => {
  /** an object containing all repositories we need to expose */
  const modules: IApi = {
    baseURL: nuxtApp.$config.public.API_BASE_URL,
    auth: new AuthModule(),
    ...
  };

  return {
    provide: {
      api: modules,
    },
  };
})

Using the properly typed interface, I can now easily import the plugin in any part of my application using useNuxtApp.

const { $api } = useNuxtApp();
console.log($api.baseURL)

Answer №3

I encountered a similar issue recently. After adding the following code snippet to my typings file (such as my.d.ts), the problem was resolved:

declare function useNuxtApp(): NuxtApp;

Answer №4

If you are looking to share the helper function hello from a plugin, you can achieve this by creating an object with the key provide, as explained in detail here:

To provide a helper on the NuxtApp instance through a plugin, simply return it under the provide key. Here's an example:

export default defineNuxtPlugin(() => {
 return {
     provide: {
         hello: (msg: string) => `Hello ${msg}!`
     }
 }
})

Furthermore, it's worth noting that in Nuxt 3, the utils/ directory is utilized for automatic importing of helper functions and utilities across your application via auto-imports (Nuxt3 Utils/).

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