/**
 * Daily quiet-hours window. Use to gate any user-facing message channel
 * (cron broadcasts, reactive ad delivery, on-demand replies) so the bot
 * doesn't ping users at 3am.
 *
 * Times are HH:MM in 24-hour clock. The window can wrap midnight
 * (e.g. start='22:00', end='06:00' = quiet from 10pm through 6am).
 *
 *   const qh = new QuietHours({ start: '22:00', end: '06:00', timezone: 'America/Sao_Paulo' })
 *   if (qh.isQuiet()) return  // skip this send
 *
 * `timezone` accepts any IANA name. Defaults to 'UTC'. Implementation uses
 * Intl.DateTimeFormat (built into the Workers runtime, no deps).
 */
export interface QuietHoursOptions {
    /** Start of the quiet window, "HH:MM" (24h). */
    start: string;
    /** End of the quiet window, "HH:MM" (24h). Equal to `start` ⇒ never quiet. */
    end: string;
    /** IANA timezone, e.g. "America/Sao_Paulo". Defaults to "UTC". */
    timezone?: string;
}
export declare class QuietHours {
    readonly startMin: number;
    readonly endMin: number;
    readonly timezone: string;
    constructor({ start, end, timezone }: QuietHoursOptions);
    /**
     * @param now optional reference time (defaults to `new Date()`).
     * @returns true if `now` falls inside the quiet window.
     */
    isQuiet(now?: Date): boolean;
    /** Sugar — convenient for `if (await guard.silent(...))` patterns. */
    isActive(now?: Date): boolean;
}
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