Exploring alternative applications of defineModel in Vue 3.4 beyond just handling inputs

The examples provided for defineModel in the Vue documentation primarily focus on data inputs. I was curious if this functionality could be utilized in different contexts, potentially eliminating the need for the somewhat cumbersome props/emit approach to data exchange between parent and child components:

(app.vue):

<script setup lang="ts">
import { ref } from 'vue'
import MyComponent from './MyComponent.vue'
  
const title = ref('v-model argument example with array')
const array = ref([1,2,3,4,5]);
</script>

<template>
  <h1>{{ title }}</h1>
  <MyComponent  v-model:array = "array"  />
  <h2>Parent array: {{array}}</h2>
</template>

(myComponent.vue):

<script setup lang="ts">
const array  = defineModel('array')

function ShortenArray() {
  array.value = array.value.slice(1);
}
</script>

<template>
  <button @click="ShortenArray">Shorten Array</button>
  <p></p>
  child array: {{ array }}
</template>

The code functions correctly, but a typescript error

Property 'slice' does not exist on type 'unknown'
is raised for array.slice(), which remains unresolved.

Explore the Vue playground here.

Answer №1

To properly define your model, make sure to include the type information. In this example, you can specify that the model is an array of numbers:

<script setup lang="ts">
const myArray = defineModel<Array<number>>('myArray')

function RemoveFirstElement() {
  myArray.value = myArray.value.slice(1);
}
</script>

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