import type { StreakSummary } from '../types';
export declare function todayISO(): string;
export declare function toISODate(date: Date): string;
export declare function parseISODate(isoDate: string): Date;
export declare function previousDayISO(isoDate: string): string;
export declare function normalizeDates(dates: string[]): string[];
export declare function calculateStreakSummary(rawDates: string[], previousDates?: string[]): StreakSummary;
export declare function startOfWeekISO(isoDate: string): string;
export declare function buildWeekDays(completedDates: string[], referenceISO?: string): Array<{
    date: string;
    day: number;
    completed: boolean;
    isToday: boolean;
}>;
export declare function currentWeekStreakCount(completedDates: string[]): number;
export declare function daysNeededForMonth(visibleYear: number, visibleMonth: number): number;
export declare function buildCalendarMonth(year: number, month: number, completedDates: string[]): Array<{
    date: string;
    day: number;
    completed: boolean;
    isToday: boolean;
    inMonth: boolean;
}>;
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