How to define component name in Vue3 setup tag?

In Vue 3, defining component names can be specified directly using the name option within the component's configuration object. This name serves as a useful identifier for debugging or as a more semantic reference when using the component in templates.

For example, suppose we have a component representing user information; we can define the component name as follows:

javascript
<template>
  <div>
    <p>Username: {{ username }}</p>
    <p>Email: {{ email }}</p>
  </div>
</template>

<script>
export default {
  name: 'UserProfile',
  data() {
    return {
      username: 'Zhang San',
      email: 'zhangsan@example.com'
    };
  }
}
</script>

In this example, we explicitly define the component name using name: 'UserProfile'. This naming convention not only helps identify the component in Vue DevTools but also provides clear context when referencing it elsewhere in the project.

Additionally, defining component names is beneficial for recursive components. For instance, if a component needs to recursively call itself within its template, a clear component name is essential:

javascript
<template>
  <div>
    <UserProfile v-if="hasManager" :user="manager" />
    <p>Username: {{ user.name }}</p>
  </div>
</template>

<script>
export default {
  name: 'UserProfile',
  props: {
    user: Object,
  },
  computed: {
    hasManager() {
      return this.user && this.user.manager;
    },
    manager() {
      return this.user.manager;
    }
  }
}
</script>

In this recursive component example, the component references itself using its name UserProfile, enabling recursive calls. This is another important use case for the name property.