Dynamic List Transitions in Vue with TypeScript

This challenge focuses on implementing smooth and visually appealing transitions when adding or removing items from a list in a Vue.js application. Dynamic list transitions enhance user experience by providing feedback during data updates, 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 dynamically adds and removes items from the list. When an item is added or removed, a transition effect should be applied to the item being added or removed, creating a visually pleasing animation. The transition should smoothly fade in new items and fade out removed items. The component should be reusable and adaptable to different list data.

Key Requirements:

• Dynamic List: The component must display a list of items that can be dynamically updated.
• Transition Effect: A fade-in transition should be applied to newly added items. A fade-out transition should be applied to items being removed.
• TypeScript: The component must be written in TypeScript, ensuring type safety.
• Reusability: The component should be designed to be easily reusable with different data structures and item types.
• Vue Transition Component: Utilize Vue's built-in <transition> component for managing the transitions.

Expected Behavior:

• When an item is added to the list, it should fade in smoothly.
• When an item is removed from the list, it should fade out smoothly.
• The transitions should not interfere with the display of other items in the list.
• The component should handle empty lists gracefully.

Edge Cases to Consider:

• Adding multiple items at once.
• Removing multiple items at once.
• Rapidly adding and removing items.
• Empty initial list.
• Items with varying content lengths.

Examples

Example 1:

Input:  Initial list: ['Apple', 'Banana'], Add 'Orange'
Output: 'Orange' fades in smoothly, appearing at the end of the list. The existing items ('Apple', 'Banana') remain visible.
Explanation: The transition component detects the addition of 'Orange' and applies the fade-in transition.

Example 2:

Input: Initial list: ['Apple', 'Banana', 'Orange'], Remove 'Banana'
Output: 'Banana' fades out smoothly, disappearing from the list. The remaining items ('Apple', 'Orange') remain visible.
Output: The list is now ['Apple', 'Orange']
Explanation: The transition component detects the removal of 'Banana' and applies the fade-out transition.

Example 3:

Input: Initial list: [], Add 'Apple', Remove 'Apple', Add 'Banana'
Output: 'Apple' fades in, then fades out. 'Banana' fades in.
Explanation: Handles the case of an initially empty list and subsequent additions and removals.

Constraints

• Transition Duration: The fade-in and fade-out transitions should have a duration of 300ms.
• Data Type: The list items will be strings.
• Performance: The transitions should not significantly impact the performance of the application, even with a large number of items. Avoid unnecessary re-renders.
• Vue Version: Assume Vue 3 is being used.

Notes

• Consider using v-if or v-for with a key to manage the list items and trigger the transitions.
• The <transition> component provides various props for customizing the transition effect (e.g., mode, css-properties). Focus on the fade transition for this challenge.
• Think about how to efficiently update the list and trigger the transitions without causing performance bottlenecks.
• You can use CSS classes to define the fade-in and fade-out animations. Vue's transition component will automatically add and remove these classes.
• The component should be self-contained and easy to integrate into other Vue applications.