import type { DashboardTask } from '../../../documents/dashboard/Task.js';
import type { RecurrenceFrequency } from '../../../embedded-types/dashboard/task/RecurrenceInfo.js';
export default class DashboardTaskRecurrenceService {
    #private;
    /**
     * Gets the next frequency date from the provided basis date.
     *
     * @param basisDate - The date from which to calculate the next frequency date.
     * @param frequency - The recurrence frequency details.
     * @returns The next frequency date or null if the frequency is in an invalid state.
     */
    static getNextFrequencyDate(basisDate: Date, frequency: RecurrenceFrequency): Date | null;
    /**
     * Moves the start and due date forward by one frequency.
     *
     * This does not take into account the recurrence effect. That should be
     * handled on the frontend.
     *
     * Makes no changes if the state of the task is invalid for recurrence or
     * there isn't recurrence info.
     *
     * @param task - The task whose dates need to be updated.
     */
    static updateDatesForRecurrence(task: DashboardTask): void;
}
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