/**
 * Reset-time parsing for usage-limit messages.
 *
 * Runtimes say when a usage limit lifts in many shapes:
 *
 * - Claude Code: `You've hit your limit · resets 3pm (America/Los_Angeles)`,
 *   `resets Oct 6, 9am`, `Your limit will reset at 5pm (Asia/Shanghai).`,
 *   `continuing automatically at 3pm`, the limit menu's `Wait here, then
 *   continue automatically at 8pm`, the old `usage limit reached|1767225600`
 *   (epoch seconds) and the API's `resets 2026-08-08 00:00 UTC`.
 * - Codex: `try again at 4:05 PM`, `try again at Oct 3rd, 2026 4:05 PM`,
 *   `try again in 4 days 7 hours 3 minutes`.
 * - Others: `retry in 45s`, `resets in 2h 5m`.
 *
 * A clock time without a date is the next time that clock time comes round
 * (in the named IANA time zone, else this machine's). Unparseable text
 * gives null — the caller then relies on the switch-back probe.
 *
 * @module services/runtime-fallback/reset-time
 */
/** Wall-clock parts in a time zone. */
interface WallParts {
    year: number;
    month: number;
    day: number;
    hour: number;
    minute: number;
}
/**
 * Whether a string is a time zone `Intl` accepts.
 *
 * @param tz - Candidate (IANA name or `UTC`)
 * @returns True when usable
 */
export declare function isValidTimeZone(tz: string | null | undefined): tz is string;
/**
 * The instant at which a wall-clock time occurs in a time zone.
 *
 * @param wall - Wall-clock parts
 * @param tz - Time zone (undefined = this machine's)
 * @returns Epoch ms
 */
export declare function zonedWallTimeToEpoch(wall: WallParts, tz: string | undefined): number;
/**
 * Parse a relative duration like `4 days 7 hours 3 minutes` / `2h 5m`.
 *
 * @param text - Duration text
 * @returns Milliseconds, or null
 */
export declare function parseRelativeDuration(text: string): number | null;
/**
 * Find when a usage limit resets, from the text of the limit message.
 *
 * @param text - Normalized terminal / error text
 * @param now - Current time (ms)
 * @param defaultTimeZone - Zone for clock times that name none (default: this machine's)
 * @returns Epoch ms of the reset, or null when the text names none
 *
 * @example
 * ```ts
 * parseResetTime("You've hit your limit · resets 3pm (UTC)", Date.UTC(2026, 9, 1, 12));
 * // Date.UTC(2026, 9, 1, 15)
 * ```
 */
export declare function parseResetTime(text: string, now: number, defaultTimeZone?: string): number | null;
export {};
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