Responding to Reactivity with Provide/Inject

Explain how to make the injected data reactive by using a ref or reactive from Vue's reactivity system, and how changes to the data are reflected across the components.

import { provide, ref } from 'vue';

export default {
  setup() {
    // Create a reactive reference
    const reactiveData = ref('Initial Value');

    // Provide the reactive data to descendants
    provide('reactiveKey', reactiveData);

    return {};
  }
};

This is a setup function of a Vue component that uses `provide` to make reactive data available to its descendant components. A ref is used to ensure the provided data is reactive.

import { inject } from 'vue';

export default {
  setup() {
    // Inject the reactive data provided by an ancestor component
    const reactiveData = inject('reactiveKey');

    // Use a computed or watch to respond to changes in the reactive data
    // reactiveData.value could be used directly in the template or computed properties

    return {
      reactiveData
    };
  }
};

This code snippet represents a setup function within a descendant component that injects the provided reactive data using the `inject` function. The injected data is made available in the component for use and is automatically reactive, meaning it will update whenever the source ref changes.