/**
 * v1.3.4 §C — shared IANA timezone helpers.
 *
 * Extracted from `cli/init.ts` (which had a local `TIMEZONE_PRESETS` +
 * `isValidIanaTimezone`) so cron CLI, per-user personalization, and the
 * conversational cron-manager all validate timezones the same way and offer
 * the same "pick from a list, never typo" UX.
 *
 * `suggestTimezone` powers the "did you mean …?" fallback against the full
 * IANA set (`Intl.supportedValuesOf("timeZone")` — ~418 zones on Node 18+).
 */
export interface TimezonePreset {
    name: string;
    value: string;
}
/** Curated shortlist for the inquirer picker (CLI) + numbered list (chat). */
export declare const TIMEZONE_PRESETS: TimezonePreset[];
/** Sentinel for the "Other — type it" picker choice. */
export declare const TIMEZONE_OTHER = "__other__";
/** True when `tz` is a valid IANA timezone name (Intl throws RangeError if not). */
export declare function isValidIanaTimezone(tz: string): boolean;
/** The full IANA timezone list (best-effort; empty array if unsupported). */
export declare function allTimezones(): string[];
/**
 * Suggest the closest valid IANA timezone for a typo'd input, or null when the
 * input is empty / nothing is close enough. Case/space/dash-insensitive; ranks
 * by edit distance over the normalized full IANA set.
 */
export declare function suggestTimezone(input: string): string | null;