import { DateTime, IDateAdapter } from '../../date-time';
import { RuleOption } from '../rule-options';
import { IPipeRule, IPipeRunFn, PipeRule } from './interfaces';
export interface IFrequencyRuleOptions {
    frequency: RuleOption.Frequency;
    interval: RuleOption.Interval;
    weekStart: RuleOption.WeekStart;
}
/**
 * The `FrequencyPipe` is the first pipe in the chain of rule pipes. It is
 * responsible for incrementing the date, as appropriate, while taking into
 * account the `RRULE` frequency and interval.
 */
export declare class FrequencyPipe extends PipeRule<IFrequencyRuleOptions> implements IPipeRule<IFrequencyRuleOptions> {
    private readonly intervalUnit;
    private intervalStartDate;
    private intervalEndDate;
    run(args: IPipeRunFn): DateTime | null;
    private normalizedStartDate;
    private normalizedEndDate;
    private incrementInterval;
    private skipToIntervalOnOrAfter;
    private dateIsWithinInterval;
}
/**
 * Given the frequency (unit) and interval, this function finds
 * how many jumps forward the first date needs in order to equal
 * or exceed the second date.
 *
 * For example:
 *
 * 1. Unit is daily and interval is 1. The second date is 3 days
 *    after the first. This will return 3.
 * 2. Unit is yearly and interval is 1. The second date is 3 days
 *    after the first. This will return 0.
 * 3. Unit is yearly and interval is 3. The second date is 4 years
 *    after the first. This will return 6.
 */
export declare function intervalDifferenceBetweenDates({ first, second, unit, interval, weekStart, }: {
    first: DateTime;
    second: DateTime;
    unit: IDateAdapter.TimeUnit | 'week';
    interval: number;
    weekStart: IDateAdapter.Weekday;
}): number;
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