Implementing Named Routes in Vue with TypeScript

This challenge focuses on creating and utilizing named routes within a Vue.js application using TypeScript. Named routes provide a cleaner and more maintainable way to navigate between components, especially when dealing with dynamic parameters or query strings. Successfully completing this challenge will demonstrate your understanding of Vue Router and TypeScript integration.

Problem Description

You are tasked with building a simple Vue.js application with three components: Home, About, and User. The User component should display user details based on a user ID passed as a route parameter. You need to define named routes for each component and implement navigation links that utilize these named routes. The application should handle both static routes (Home, About) and dynamic routes (User with a user ID). The navigation should be handled within a Navigation component.

Key Requirements:

• Define Named Routes: Create named routes for Home, About, and User. The User route should be dynamic, accepting a userId parameter.
• Navigation Links: Implement navigation links in the Navigation component that use the defined named routes. These links should navigate to the corresponding components when clicked.
• Dynamic Route Handling: The User component should receive the userId parameter from the route and display it.
• TypeScript: The entire application must be written in TypeScript, ensuring type safety and code maintainability.
• Vue Router: Utilize Vue Router for navigation and route management.

Expected Behavior:

• Clicking the "Home" link should navigate to the Home component.
• Clicking the "About" link should navigate to the About component.
• Clicking the "User" link should navigate to the User component with a default userId of 1.
• The User component should display the userId passed in the route.
• The application should handle invalid userId values gracefully (e.g., display an error message or redirect to another page).

Edge Cases to Consider:

• What happens if the userId is not a number?
• What happens if the userId is negative?
• How can you handle a scenario where a user with the given userId doesn't exist? (For simplicity, you don't need to fetch data from a server, but consider how you might handle this in a real application).

Examples

Example 1:

Input: User link clicked (initial route: /)
Output: Route changes to /user/1, User component displays "User ID: 1"
Explanation: The navigation link uses the named route 'user' with a userId of 1. Vue Router updates the route and renders the User component, passing the userId as a prop.

Example 2:

Input: User link clicked (route: /about)
Output: Route changes to /user/2, User component displays "User ID: 2"
Explanation: The navigation link uses the named route 'user' with a userId of 2. Vue Router updates the route and renders the User component, passing the userId as a prop.

Example 3:

Input: User link clicked (route: /user/5) and userId 5 doesn't exist.
Output: Route remains /user/5, User component displays an error message "User not found".
Explanation: The navigation link uses the named route 'user' with a userId of 5. Vue Router updates the route and renders the User component, passing the userId as a prop. The User component handles the case where the user is not found.

Constraints

• The application should be a single-file component Vue.js project.
• You should use Vue Router version 4 or higher.
• The userId parameter should be a number. Handle non-numeric inputs gracefully.
• The application should be functional and demonstrate the core concept of named routes. No external libraries beyond Vue and Vue Router are required.
• The solution should be well-structured and readable, following TypeScript best practices.

Notes

• Consider using router-link for navigation.
• Use the this.$router.push() method for programmatic navigation.
• The User component can simply display the userId as a string. You don't need to implement a full user data fetching mechanism.
• Focus on demonstrating the correct usage of named routes and route parameters.
• Think about how you would handle errors or invalid input in a real-world application.