import type { Queryable } from 'mysql2-async';
export interface SchedulerOpts {
    /**
     * Minimum number of minutes that need to go by before the task will be run again.
     *
     * For instance, if you set this to 30, the task will run approximately every 30 minutes.
     *
     * If there is downtime, the task will likely run immediately after startup.
     */
    minutesBetween?: number;
    /**
     * Task will only execute during the given hour, if it has been long enough
     * since the last execution to satisfy minutesBetween.
     *
     * Hour is in the API container's time zone, be sure to set it appropriately with the
     * TZ environment variable.
     *
     * Starts with 0 (12am-1am), ends at 23 (11pm-12am)
     *
     * For a nightly task that should only execute once, set this to the desired hour
     * and minutesBetween > 60. Smaller minutesBetween will mean more executions during
     * that hour.
     */
    duringHour?: number;
    /**
     * Task will only execute during the given day of the week.
     *
     * 1 is Monday and 7 is Sunday
     *
     * Best used with duringHour or with minutesBetween > 24 * 60 - note that if
     * minutesBetween is small, the task will execute many times on the given day.
     */
    duringDayOfWeek?: DayOfWeek;
    /**
     * Task will only execute during the given day of the month.
     *
     * Starts with 1
     *
     * Best used with duringHour or with minutesBetween > 24 * 60 - note that if
     * minutesBetween is small, the task will execute many times on the given day.
     */
    duringDayOfMonth?: number;
}
export type SchedulerJob = () => Promise<void> | void;
export declare enum DayOfWeek {
    MONDAY = 1,
    TUESDAY = 2,
    WEDNESDAY = 3,
    THURSDAY = 4,
    FRIDAY = 5,
    SATURDAY = 6,
    SUNDAY = 7
}
export declare class Scheduler {
    protected jobs: Map<string, {
        job: SchedulerJob;
    } & SchedulerOpts & {
        minutesBetween: number;
    }>;
    protected started: boolean;
    schedule(jobname: string, job: SchedulerJob, opts: SchedulerOpts): Promise<void>;
    start(): Promise<void>;
    static createTable(db: Queryable): Promise<void>;
}
export declare const scheduler: Scheduler;