Function getRetryAfterDelayMs

packages/core/src/utils/retry.ts:251–282

* Extracts the Retry-After delay from an error object's headers. * @param error The error object. * @returns The delay in milliseconds, or 0 if not found or invalid.

(error: unknown)

 * @returns The delay in milliseconds, or 0 if not found or invalid.
 */
function getRetryAfterDelayMs(error: unknown): number {
  if (typeof error === 'object' && error !== null) {
    // Check for error.response.headers (common in axios errors)
    if (
      'response' in error &&
      typeof (error as { response?: unknown }).response === 'object' &&
      (error as { response?: unknown }).response !== null
    ) {
      const response = (error as { response: { headers?: unknown } }).response;
      if (
        'headers' in response &&
        typeof response.headers === 'object' &&
        response.headers !== null
      ) {
        const headers = response.headers as { 'retry-after'?: unknown };
        const retryAfterHeader = headers['retry-after'];
        if (typeof retryAfterHeader === 'string') {
          const retryAfterSeconds = parseInt(retryAfterHeader, 10);
          if (!isNaN(retryAfterSeconds)) {
            return retryAfterSeconds * 1000;
          }
          // It might be an HTTP date
          const retryAfterDate = new Date(retryAfterHeader);
          if (!isNaN(retryAfterDate.getTime())) {
            return Math.max(0, retryAfterDate.getTime() - Date.now());
          }
        }
      }
    }
  }
  return 0;
}

/**
 * Determines the delay duration based on the error, prioritizing Retry-After header.