Coding⏱️ 2 min read📅 2026-06-03

How to Fix: How to declare a function that throws an error in Typescript

Function that throws an error in Typescript without try/catch

Quick Answer: Use the 'throw' keyword to declare a function that throws an exception, and handle it with a try-catch block when calling the function.

📋 Table of Contents

  1. 🔧 Proven Troubleshooting Steps
  2. 💡 Conclusion

In Typescript, you can declare a function that throws an error by using the throw new Error statement instead of throw new Exception. This is because Typescript's built-in errors are instances of the Error class.

🔧 Proven Troubleshooting Steps

Method 1: Declare Function with Error

  1. Step 1: Define a function that throws an error using throw new Error('Error message');.

Method 2: Catch the Error

  1. Step 1: Call the function without handling the exception.

💡 Conclusion

By using the throw new Error statement, you can declare a function that throws an error in Typescript. If you want to use the function without handling the exception, you need to catch the error using a try-catch block.

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