Interactive List Item Transitions in Vue with TypeScript

This challenge focuses on enhancing user experience in a Vue.js application by implementing smooth enter and leave transitions for list items. Adding these transitions provides visual feedback to the user when items are added or removed from a list, making the application feel more responsive and polished. You'll be using Vue's built-in transition component and TypeScript for type safety.

Problem Description

You are tasked with creating a Vue component that displays a list of items and applies enter and leave transitions to each item as they are added or removed. The component should dynamically update the list based on an array of data. The transitions should be visually appealing and provide clear feedback to the user.

What needs to be achieved:

• Create a Vue component that renders a list of items.
• Implement enter and leave transitions for each list item using Vue's <transition> component.
• Dynamically update the list of items based on a data array.
• Ensure the transitions are smooth and visually consistent.

Key Requirements:

• Use Vue's <transition> component for managing the transitions.
• Utilize TypeScript for type safety and improved code maintainability.
• The transitions should animate the item's appearance and disappearance. You can use CSS classes to define the animation.
• The component should handle adding and removing items from the list.

Expected Behavior:

• When an item is added to the list, it should smoothly transition in.
• When an item is removed from the list, it should smoothly transition out.
• The transitions should not interfere with the rendering of other items in the list.
• The component should re-render correctly when the data array changes.

Edge Cases to Consider:

• Initial rendering of the list: The transitions should still apply when the list is first rendered.
• Rapid additions/removals: Ensure the transitions don't become visually jarring with frequent updates.
• Empty list: The component should handle the case where the list is empty gracefully.

Examples

Example 1:

Input: data = ["Apple", "Banana", "Cherry"]
Output: A list displaying "Apple", "Banana", and "Cherry" with smooth enter transitions upon initial render.
Explanation: The component renders the list items. Each item smoothly fades in during the initial render.

Example 2:

Input: data = ["Apple", "Banana", "Cherry"];  Then, data becomes ["Apple", "Cherry"] after removing "Banana".
Output: "Banana" smoothly fades out, and the list updates to display only "Apple" and "Cherry".
Explanation: When "Banana" is removed, the component triggers the leave transition, smoothly fading it out. The list then re-renders with the updated data.

Example 3:

Input: data = [];
Output: An empty list is displayed. No errors occur.
Explanation: The component handles the empty list case gracefully, rendering nothing.

Constraints

• The transitions should be implemented using CSS classes and Vue's <transition> component. No external animation libraries are allowed.
• The component should be written in TypeScript.
• The animation duration should be reasonable (e.g., between 0.2 and 0.5 seconds).
• The component should be reusable and easily adaptable to different list item structures.
• The component should be performant; excessive re-renders should be avoided.

Notes

• Consider using the v-if directive for adding and removing items to trigger the transitions effectively. Directly manipulating the array might not always trigger the necessary lifecycle hooks.
• The <transition> component provides hooks like enter, leave, before-enter, before-leave, enter-active, and leave-active that you can use to control the animation.
• Think about how to make the transitions visually appealing and consistent with the overall design of your application. Simple fade-in/fade-out transitions are a good starting point.
• Pay attention to the order of operations when adding and removing items to ensure the transitions are triggered correctly.