Why is the Vue template not rendering?

Question

Laravel

Greetings!
Given: Laravel8, Vue 3 and Blade templates.
I use a little-familiar admin panel (which has a lot of things on Vue), in which I try to display the contents of the View in which my Vue component is using its regular means.

mycomponent.blade.php
<mycomponent></mycomponent>

mycomponent.vue

<template>
  <div>
    It`s my component 
  </div>
</template>

<script>
  export default {
    mounted() {
      console.log("My component mounted...");
    }
  };
</script>

Well, in app-admin.js

Vue.component('mycomponent', require('./components/mycomponent.vue').default);

At the same time, instead of a template, the output is just a comment "", but the console displays "My component mounted ..."

Tell me, please, what did I do wrong and what should I do?
PS npm run watch I run, there are no errors anywhere.