Typescript Await Error: Handling Common Issues and Errors

Typescript await error

Introduction

When working with TypeScript and asynchronous code, the await keyword is commonly used to pause the execution of a function until a promise is resolved. However, there are certain errors that can occur when using await in TypeScript. This article will explore some common await errors and how to handle them.

1. Syntax Error

One of the most common await errors is a syntax error. This occurs when the await keyword is used outside of an asynchronous function. In TypeScript, any function that uses the await keyword must be marked as async. To fix this error, simply add the async keyword before the function declaration.

2. Unhandled Promise Rejection

Another common await error is an unhandled promise rejection. This error occurs when an awaited promise is rejected but no catch or try/catch block is used to handle the rejection. To handle this error, make sure to add a catch block after the await statement or use a try/catch block to catch the rejection.

3. Incorrect Use of Await

Sometimes, the await keyword is used incorrectly, leading to an error. One common mistake is awaiting a non-promise value. The await keyword can only be used with promises, so make sure to check that the value being awaited is indeed a promise. If it is not, you can wrap it in a Promise.resolve() to convert it into a promise.

4. Missing Async Keyword

Forgetting to mark a function as async when using the await keyword will result in an error. This is because the await keyword can only be used inside an asynchronous function. To fix this error, simply add the async keyword before the function declaration.

Conclusion

The await keyword in TypeScript is a powerful tool for handling asynchronous code. However, it is important to be aware of the potential errors that can occur when using await. By understanding and addressing these errors, you can write more robust and error-free TypeScript code.

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