The Problem of Unspecified Return Type in Vue 3 Functions Using Typescript

Here is the code snippet I am working with:

    <template>
      <div>        
        <ul v-if="list.length !== 0">
          {{
            list
          }}
        </ul>
      </div>
    </template>
    <script>
    export default {
      props: {
        
        list: {
          type: Array,
          default: () => {
            return []
          },
        },
        
      },
    }
    </script>

However, I'm encountering an error on a particular line and have tried various solutions without success.

You can view the error message at this link: https://i.sstatic.net/PUFRi.png

I have also attempted to implement the solution provided in this Stack Overflow thread, but nothing seems to be resolving the issue: Vue 2 - How to set default type of array in props

Answer №1

This is not an issue, it's actually a reminder that the anonymous function needs to specify a return type. Your IDE will display the name of the warning, and you can find more information on it by visiting a page with helpful examples.

To address this reminder, make the following adjustment:

itemsList: {
  type: Array,
  default: ():Array => {
    return []
  },
},

Answer №2

It seems that you forgot to include the function return type in your code. You have specified the prop type, but not the function return type.

To correct this issue, your code should look like the following (remember to replace "any" with the actual type):

export default {
  props: {
    list: {
      type: Array,
      default: () : Array<any> => {
        return []
      },
    },
  },
}

Answer №3

If you're working with Vue 3 and Typescript, a useful tip is to utilize the defineComponent function to enclose your component options object, as outlined in the documentation found at https://v3.vuejs.org/guide/typescript-support.html#defining-vue-components. By following this recommendation and ensuring your IDE settings are correctly configured, any issues should be resolved.

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