Error Handling in Async Code

What advanced error reporting pattern is shown?

class RetryError extends AggregateError {
  constructor(errors, message, attempts) {
    super(errors, message);
    this.attempts = attempts;
  }
}

async function withRetry(fn, maxAttempts = 3) {
  const errors = [];
  for (let i = 0; i < maxAttempts; i++) {
    try {
      return await fn(i);
    } catch (error) {
      errors.push(error);
      if (i === maxAttempts - 1) {
        throw new RetryError(errors, 'All retry attempts failed', maxAttempts);
      }
    }
  }
}

Simple retry logic
Basic error collection
Comprehensive retry with error history
This implements comprehensive retry with error history: 1) Collects errors from all retry attempts, 2) Creates custom error type with attempt information, 3) Uses AggregateError for multiple error collection, 4) Provides detailed failure context, 5) Useful for debugging retry failures, 6) Important for understanding transient failure patterns.
Error transformation

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