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A guide on retaining reactivity when passing reactive data in Vue 3 composables, ensuring your components stay updated effortlessly.
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How to Pass Reactive Data to a Composable in Vue 3

When working with Vue 3, developers often encounter situations where they need to pass reactive objects, such as data state, to composables while preserving their reactivity. In this guide, we'll explore how to effectively handle this scenario. We will delve into the question raised by a developer seeking to understand the intricacies of Vue's reactivity system and how to use it correctly in composables.

The Problem

The developer wanted to pass a reactive property, specifically state.myObjectList, to a composable function called useSimpleCalculator. The goal was to ensure that any changes to the elements within state.myObjectList would be reflected in the computed property dynamicSumValue. The challenge arises from a key point in Vue's reactivity system: directly passing properties from a reactive object can lead to a loss of reactivity.

Understanding Vue's Reactivity System

In Vue 3, reactive creates a deep proxy for the object you define. This means that any changes made to this object should automatically trigger updates in your UI. However, there is a caveat: passing members of a reactive object directly into functions (like composables) can result in losing the reactivity of those members.

The Solution

To effectively retain reactivity while passing reactive data to a composable, you'll want to utilize toRef or toRefs. Here’s how you can do it step-by-step:

Step 1: Declare Your State

You would typically declare your state as follows:

[[See Video to Reveal this Text or Code Snippet]]

This setup initializes state with a myObjectList that can be populated via an API call upon component mount.

Step 2: Passing State to a Composable

Here’s where the magic happens! Instead of passing state.myObjectList directly, use toRef or toRefs to maintain reactivity.

Using toRef

You can pass a specific property as a ref like this:

[[See Video to Reveal this Text or Code Snippet]]

Using toRefs

Alternatively, if you want to destructure and get multiple reactive properties, you can do it this way:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Define Your Composable

In your composable function, you can define your computed properties as usual:

[[See Video to Reveal this Text or Code Snippet]]

Using this structure ensures that dynamicSumValue remains reactive and updates whenever changes happen in myObjectList.

Conclusion

By utilizing toRef or toRefs, you can elegantly pass reactive properties to composables without losing their reactivity. This approach adheres to best practices in Vue 3, allowing your components to respond dynamically to state changes while maintaining clean and cohesive code.

With this understanding, you'll avoid common pitfalls and enhance the interactivity of your Vue applications. Happy coding!