Function parseRetryAfter

packages/utils/src/retry.ts:44–59

(header: string | null)

 * back to their own backoff.
 */
export function parseRetryAfter(header: string | null): number | null {
  if (!header) return null
  const trimmed = header.trim()
  if (trimmed.length === 0) return null
  const seconds = Number(trimmed)
  if (Number.isFinite(seconds) && seconds >= 0) {
    return Math.min(Math.floor(seconds * 1000), RETRY_AFTER_MAX_MS)
  }
  const dateMs = Date.parse(trimmed)
  if (!Number.isNaN(dateMs)) {
    const delta = dateMs - Date.now()
    if (delta <= 0) return 0
    return Math.min(delta, RETRY_AFTER_MAX_MS)
  }
  return null
}