Retry Promise

async function retryPromise<T>(
  fn: () => Promise<T>,
  maxAttempts = 3, // Retry 3 times by default
  delay = 1000 // Retry after 1 second by default
): Promise<T> {
  let attempts = 0;
 
  while (attempts < maxAttempts) {
    try {
      return await fn();
    } catch {
      attempts++;
      if (attempts >= maxAttempts) throw new Error("Max attempts reached.");
      await new Promise((res) => setTimeout(res, delay));
    }
  }
 
  throw new Error("Unexpected error.");
}

// Mock function
async function fetchData() {
  if (Math.random() > 0.7) return "Success!";
  throw new Error("Failed!");
}
 
retryPromise(fetchData).then(console.log); // Success!