It provides access to features like: Nitro engine, composition API and new CLI, by simply installing and activating the bridge. Nuxt 3 introduces Nuxt Bridge - forward-compatibility layer that upgrades Nuxt 2 applications with Nuxt 3 features, allowing it to upgrade itself piece by piece. Migrating from Vue 2 to Vue 3 using Nuxt Bridge The change in the Nuxt directory structure involves replacing `store/` with `composables/` directory, since Vue 3introduces composables which replaces stores. `app.vue` is the main component of the Nuxt application, so everything added there will be global and included in every page. The biggest changes were done to `app.vue` - `pages/` directory is optional and if isn’t present, the application won’t include a vue-router, which is useful when creating a loading page or an application that doesn’t need routing. Nuxt 3 introduces a slightly changed file structure. In the building process, Vite bundles code with preconfigured Rollup to optimize static assets for production. For development, the server Vite has rich feature enhancements over native ES modules and a very fast Hot Module Replacement (HMR). This tool provides a faster development experience for web projects. Vite is a next-generation frontend tooling, which is a built-in feature for Nuxt 3. Nuxt 3 provides the possibility to deploy on Azure or Netlify with no configuration required, along with a Firebase or Cloudflare deploy with minimal configuration. Nitro allows you to deploy the output on Node.js, Serverless, Workers, Edge-side rendering, or as purely static. The thing is that output is lightweight: minified and without any node modules. In production, the engine builds the application and the server into one directory - `.output`.
It also includes a server API and server middleware. Nitro is a full-stack server which uses Rollup and Node.js workers in development to serve code and context isolation. It also allows you to easily integrate auto-imported composables with a popular Vue Store composable called Pina.
If there is no export name, the composable will be accessible as pascelCase of the file name. As you can see above, a composable is exported as useFoo, just as declared in the const name.
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