import type { Id, StrongArray } from '@toreda/strong-types';
import type { TimerCallback } from '../callback';
import type { TimerCallbackSync } from './sync';
/**
 * @category Timers
 */
export declare class TimerCallbackGroup {
    readonly id: Id;
    readonly _once: StrongArray<TimerCallback | TimerCallbackSync>;
    readonly _always: StrongArray<TimerCallback | TimerCallbackSync>;
    constructor(id: string);
    reset(): void;
    execute(duration?: number | null): Promise<void>;
    invoke(fn: TimerCallback | TimerCallbackSync, duration?: number | null): Promise<void>;
    once(duration?: number | null): Promise<void>;
    always(duration?: number | null): Promise<void>;
}