[Vuejs]-Vue3 documentation example codeblocks are strange

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In Vue 3, Vue.createApp({}) replaces new Vue({}) from Vue 2. This line of code is typically in your entry file, where you mount the app (not in your component files).

The code in the <script> tag you showed is for single file components, and you can continue using that style. Never would you use Vue.createApp() or new Vue() in those single file components.

You can checkout an example Vue 3 app that shows Vue.createApp() in src/main.js, while the single file components in src/components use the Options API that you’re also using.

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