import type { Kysely } from 'kysely';
import type { JobRegistry } from './registry.js';
/**
 * ScheduleManager polls the database for cron-scheduled jobs that are due,
 * enqueues them, and advances their next_run_at timestamps.
 */
export declare class ScheduleManager {
    private running;
    private pollTimer;
    private readonly pollInterval;
    private readonly db;
    private readonly registry;
    constructor(db: Kysely<unknown>, registry: JobRegistry, pollInterval?: number);
    /** Upserts all registered scheduled jobs into the database. */
    syncSchedules(): Promise<void>;
    /** Starts the polling loop. */
    start(): void;
    /** Stops the polling loop. */
    stop(): Promise<void>;
    isRunning(): boolean;
    /**
     * Parses a 5-field cron expression and returns the next matching minute
     * after `from`. Scans up to ~1 year of minutes before giving up.
     */
    computeNextRun(cronExpr: string, from?: Date): Date;
    /** Arms the next poll timer. */
    private schedulePoll;
    /** Runs one poll cycle, then re-arms the timer if still running. */
    private poll;
    /**
     * Finds all schedules that are due and processes each one:
     * - Skips enqueuing if the job already has a pending/active instance.
     * - Otherwise enqueues a new job instance.
     * In both cases, advances the schedule's next_run_at.
     */
    private checkSchedules;
    /** Inserts a new job instance into the jobs table. */
    private enqueueJob;
    /** Updates a schedule's next_run_at and records last_run_at. */
    private advanceSchedule;
    /** Returns true if a job with the given name is already created or active. */
    private hasPendingJob;
    /**
     * Checks whether a single cron field expression matches the given value.
     * Supports: wildcard (*), lists (1,5,10), ranges (1-5), and steps (star/5, 1-10/2).
     */
    private matchesCronField;
    /** Evaluates a single segment of a cron field (step, range, or literal). */
    private segmentMatches;
}
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