/**
 * Retry-After on a 429 (RFC 9110 section 10.2.3) is either a number of
 * seconds or an HTTP date. parseInt on a date gives NaN, which setTimeout
 * treats as 0, so the retry went out at once. Both clients parse it here.
 */
/** The longest one 429 wait lasts, whatever Retry-After asks for. */
export declare const MAX_RETRY_AFTER_MS = 60000;
/**
 * Milliseconds to wait before retrying a 429: seconds or an HTTP date, capped
 * at MAX_RETRY_AFTER_MS. A date in the past means retry now. A missing or
 * unreadable header gives fallbackMs.
 */
export declare function retryAfterMs(header: string | null | undefined, fallbackMs: number, now?: number): number;
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