In Typescript with Vue.JS, the type 'Users[]' does not include the essential properties of type 'ArrayConstructor' such as isArray, prototype, from, of, and [Symbol.species]

Embarking on my journey with typescript and vuejs, I stumbled upon a perplexing error that has halted my progress for the past 48 hours. The error message reads as:

Type 'Users[]' is missing the following properties from type 'ArrayConstructor': isArray, prototype, from, of, [Symbol.species]

Here's a snippet from my GetAll.controller.ts:

import { supabase } from "../server";

type Users = {
    user_id: Number,
    user_username: String,
    user_email: String,
    user_password: String,
    user_token: String
}

export async function GetAll():Promise<Users[]> {
    console.log('go');
    
    try {

        let { data, error } = await supabase
            .from('users')
            .select('*')
        if (error) throw error
        if (data) {
            return data
        } else {
            throw data
        }

    } catch (err) { throw(err); }
}

Now, taking a look at my App.vue:

<script lang="ts">
import {GetAll} from './API/GetAll.controller';

export default {
  name: 'app',
  data(){
    return {
      users: Array
    }
  },
  async mounted() {
    this.users = await GetAll()
  }
}
</script>

The error seems to be lurking beneath the surface right after this.users inside the mounted() method.

Answer №1

Thank you very much for your assistance, the issue has been resolved. Below is the solution :

<script lang="ts">
import {FetchAll, Members} from './API/FetchAll.controller';

export default {
  name: 'app',
  data(){
     return {
      members: [] as Members[]
    }
  },
  async mounted() {
    this.members = await FetchAll()
  }
}
</script>

Answer №2

It's important to provide users with the correct initial value. Failure to specify the user type in TypeScript may result in the default variable type being assigned to your initial value.

...
  data(){
     return {
      users: [] as Users[]
    }
  }
...

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