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The $children instance property has been removed from Vue 3.0 and is no longer supported.

2.x Syntax

In 2.x, developers could access direct child components of the current instance with this.$children:

    <img alt="Vue logo" src="./assets/logo.png">
    <my-button>Change logo</my-button>

import MyButton from './MyButton'

export default {
  components: {
  mounted() {
    console.log(this.$children) // [VueComponent]

3.x Update

In 3.x, the $children property is removed and no longer supported. Instead, if you need to access a child component instance, we recommend using template refs.

Migration Strategy

Migration build flag: INSTANCE_CHILDREN