heeel in typescript

To handle errors in an asynchronous TypeScript function, you can use the try...catch block along with Promises. Here's an example code block:

index.ts
async function fetchData(url: string): Promise<any> {
  try {
    const response = await fetch(url);
    const data = await response.json();
    return data;
  } catch (error) {
    console.error(error);
    throw new Error("request failed");
  }
}

//calling the async function
fetchData('https://jsonplaceholder.typicode.com/todos/1')
  .then(data => console.log(data))
  .catch(error => console.error(error));
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In the above code, the fetchData function uses await to wait for the response from the API. The try...catch block is used to handle any errors that may occur during the API request. If an error occurs, it is logged to the console and a new Error object is thrown with a custom message.

The fetchData function returns a Promise, which is resolved if the API request is successful and rejected if there is an error. When calling the fetchData function, the then method is used to handle the resolved Promise, and the catch method is used to handle any errors that may occur.