Using Typescript: Attempted to change the property type from a library and received the error "Subsequent property declarations must have the same

Is there a way to override the property type from a library declaration? I attempted to do so using an interface but received an error stating

Subsequent property declarations must have the same type
. How can this issue be resolved?

// Library Declaration
declare class Auth {
    user: Record<string, string | number> | null 
    // I want to remove the null type in the user property without needing to use `non-null assertion` in line 21
    // Changing this file is not possible as it is a third-party library
}

// ------------------------------

// Our File

// My Attempt at Overriding the Interface, which failed
interface Auth {
    user: Record<string, string | number>
}

const a: Auth = {
    user: {
        name: 'joko',
        age: 30
    }
}

const userName = a.user!.name
// const userName = a.user.name // <-- I wish to use this syntax to access properties without worries

I tried to override the library declaration using an interface but was unsuccessful. My desired outcome is to be able to override the type without modifying the original library code, solely through our own code.

Answer №1

I managed to resolve this issue on my own. Specifically, I needed to customize the Auth interface within the nuxt-auth module. Below is the solution I came up with:

  1. To begin, I duplicated the modules types from the node_modules directory and saved them in our custom type file. Then, I made the necessary changes to the interface by replacing instances of Auth with IAuth. The modified interface is now referred to as IAuth.
import { IAuth } from '~/interface/auth/model';

export * from '@nuxtjs/auth-next/dist';

declare module 'vue/types/vue' {
  interface Vue {
    $auth: IAuth;
  }
}

// rest of the file
  1. Next, I added the previously created file as a path in the tsconfig.json, which instructs TypeScript to utilize this file instead of the original module types.
"compilerOptions": {
// ...
"paths": {
    "@nuxtjs/auth-next": [
        "types/nuxt-auth.d.ts"
      ],
    // ...  
   }
// ...
}

With these adjustments, the type now functions correctly using our customized interface.

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