import { Cron } from 'croner';
import { type ScheduleRow } from './db.js';
import type { GatewayCoordinator, PiNotifier } from './slack.js';
export type ScheduleInput = {
    title: string;
    instructions: string;
    at: string;
} | {
    title: string;
    instructions: string;
    cron: string;
    timezone: string;
};
export declare function parseAt(value: string): string;
export declare function validateTimezone(timezone: string): void;
export declare function cronFor(expression: string, timezone: string): Cron;
export declare function nextCronOccurrence(expression: string, timezone: string, after: Date): string;
export declare function addSchedule(input: ScheduleInput, clock?: () => Date): ScheduleRow;
export declare function enableSchedule(row: ScheduleRow, clock?: () => Date): ScheduleRow;
export declare function materializeDueSchedules(clock?: () => Date): Record<string, unknown>[];
export declare class SchedulerService {
    private readonly notifier;
    private readonly coordinator;
    private readonly clock;
    private timer;
    constructor(notifier: PiNotifier, coordinator: GatewayCoordinator, clock?: () => Date);
    tick(): Promise<void>;
    start(intervalMs?: number): void;
    stop(): void;
}