import { type DateTimezoneUtcNormalFunctionInput, type DateTimezoneUtcNormalInstance } from './date.timezone';
import { type DateRange } from './date.range';
/**
 * Modifies the input DateRange to fit within a 24 hour period.
 *
 * I.E. 12:00AM 1/1/2020 to 12:00PM 1/4/2020 becomes 12:00AM 1/1/2020 to 12:00PM 1/1/2020
 */
export type FitDateRangeToDayPeriodFunction = (<T extends DateRange>(dateRange: T) => T) & {
    readonly _timezoneInstance: DateTimezoneUtcNormalInstance;
};
/**
 * Creates a {@link FitDateRangeToDayPeriodFunction} that collapses a multi-day date range into a single-day period within the given timezone.
 *
 * The function first normalizes the range into the target timezone, fits it to a 24-hour period, then converts back.
 *
 * @param timezone - Timezone applied when collapsing the range to a single day.
 * @returns Fitter that snaps any range to a single-day window in the bound timezone.
 *
 * @example
 * ```ts
 * const fit = fitDateRangeToDayPeriodFunction('America/Chicago');
 * const range = { start: new Date('2024-01-01T10:00:00Z'), end: new Date('2024-01-03T14:00:00Z') };
 * const fitted = fit(range);
 * // fitted spans from 10:00 to 14:00 on the same day (4 hours)
 * ```
 *
 * @__NO_SIDE_EFFECTS__
 */
export declare function fitDateRangeToDayPeriodFunction(timezone: DateTimezoneUtcNormalFunctionInput): FitDateRangeToDayPeriodFunction;
/**
 * Fits the DateRange to a single "day" period from the start time within the given timezone.
 *
 * Convenience wrapper around {@link fitDateRangeToDayPeriodFunction}.
 *
 * @param dateRange - Range to collapse onto a single calendar day.
 * @param timezone - Timezone governing the day boundary calculation.
 * @returns Range snapped to a single-day window in the target timezone.
 */
export declare function fitDateRangeToDayPeriod<T extends DateRange = DateRange>(dateRange: T, timezone: DateTimezoneUtcNormalFunctionInput): T;