What are some effective error handling techniques in TypeScript?

What are some effective error handling techniques in TypeScript?

In TypeScript, you can use try-catch blocks, custom error classes, and the 'never' type for better error handling.

Can you explain how to create a custom error class?

Sure! You can create a custom error class by extending the built-in Error class. Here's an example:

class CustomError extends Error {
    constructor(message: string) {
        super(message);
        this.name = 'CustomError';
    }
}

How do I use try-catch with async functions?

You can use try-catch with async functions by wrapping the await call in a try block. For example:

async function fetchData() {
    try {
        const response = await fetch('url');
        const data = await response.json();
        return data;
    } catch (error) {
        console.error('Error fetching data:', error);
    }
}

What is the 'never' type and how does it help in error handling?

The 'never' type represents values that never occur. It's useful in functions that always throw an error or have infinite loops, helping TypeScript understand that these paths won't return a value.