Issue encountered when utilizing properties in a Vue.js instance with vue-class-components and TypeScript

I am looking to create a global variable for my server's URL.

In my main.ts file, I added the following line:

Vue.prototype.$apiUrl = "http://localhost:3000";

Then, when trying to use it in my App.vue file:

console.log(this.$apiUrl)

The URL is displayed in the browser console, however, I encountered this error message:

Property '$apiUrl' does not exist on type 'App'. Vetur(2339)

This issue is causing some parts of the app to have an undefined $apiUrl value. How can I resolve this?

Answer №1

It's important to note that the Class API proposal has been abandoned. If you are working with Vue + Typescript prior to the release of Vue 3, it is recommended to use the Vue.extend({}) component style:

<script lang="ts">
  import Vue from 'vue';

  export default Vue.extend({
    ...
  })
</script>

If you need to add global typings to your Vue instance, refer to the documentation on Typescript Support.

To implement this, include the following in your shims file:

import Vue from 'vue'

declare module 'vue/types/vue' {
  interface Vue {
    $apiUrl: string;
  }
}

Answer №2

Issue Resolved! Adding the $apiUrl to Vue types resolved the problem.

To do this, I created a .d.ts file within my @types folder and included the following code:

import Vue from 'vue'

declare module 'vue/types/vue' {
  interface Vue {
    $apiUrl: string
  }
}

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