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Hi @Ahmad .W Nabhan. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
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In Nuxt 3 composables, it is generally preferred to use
useState over ref. Here's why:
1. SSR-friendly: useState is specifically designed to be SSR-friendly, meaning it works seamlessly in both server-side and client-side rendering scenarios. It preserves the state during server-side rendering and hydration on the client side Docs > Getting-started > State Management (https://nuxt.com/docs/getting-started/state-management).
2. Shared state: useState creates a reactive and shared state across components. This means you can easily share state between different parts of your application without additional setup Docs > Getting-started > State Management (https://nuxt.com/docs/getting-started/state-management).
3. Automatic code splitting: useState is part of Nuxt's built-in state management system, which benefits from Nuxt's automatic code splitting features Docs > Getting-started > State Management (https://nuxt.com/docs/getting-started/state-management).
4. Avoiding memory leaks: Using useState helps prevent potential memory leaks that could occur with improperly managed global state. For example, the docs explicitly warn against using ref outside of <script setup> or setup() function Docs > Getting-started > State Management#best-practices (https://nuxt.com/docs/getting-started/state-management#best-practices).
5. Nuxt-specific optimizations: useState is a Nuxt-specific composable that is optimized for use within the Nuxt ecosystem, providing better integration with other Nuxt features and optimizations.
Here's a basic example of how to use useState in a composable:
Docs > Getting-started > State Management#shared-state (https://nuxt.com/docs/getting-started/state-management#shared-state)
While ref from Vue's Composition API is still usable in Nuxt, useState is the recommended approach for managing state in Nuxt applications, especially when that state needs to be shared or preserved across server/client boundaries.
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If put simple, consider useState as a 'store' - you can access the same referenced value across multiple pages / parts of an app. Also that is SSR-friendly (in case the value can be serialized). The 'ref' is just a local wrapper reactive value.