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* Calculates Easter Sunday (Meeus/Jones/Butcher algorithm)\n * Valid for Gregorian calendar (1583+)\n */\nexport function getEasterSunday(year: number): Date {\n const a = year % 19;\n const b = Math.floor(year / 100);\n const c = year % 100;\n const d = Math.floor(b / 4);\n const e = b % 4;\n const f = Math.floor((b + 8) / 25);\n const g = Math.floor((b - f + 1) / 3);\n const h = (19 * a + b - d - g + 15) % 30;\n const i = Math.floor(c / 4);\n const k = c % 4;\n const l = (32 + 2 * e + 2 * i - h - k) % 7;\n const m = Math.floor((a + 11 * h + 22 * l) / 451);\n const month = Math.floor((h + l - 7 * m + 114) / 31);\n const day = ((h + l - 7 * m + 114) % 31) + 1;\n\n return new Date(Date.UTC(year, month - 1, day));\n}\n","/**\n * Calculates the Nth weekday of a month\n * @param year - Year\n * @param month - Month (1-12)\n * @param weekday - Weekday (0=Sun, 1=Mon, ..., 6=Sat)\n * @param n - Occurrence (1=first, 2=second, -1=last)\n */\nexport function getNthWeekday(year: number, month: number, weekday: number, n: number): Date {\n if (n > 0) {\n // From start of month\n const first = new Date(Date.UTC(year, month - 1, 1));\n const firstWeekday = first.getUTCDay();\n const diff = (weekday - firstWeekday + 7) % 7;\n const day = 1 + diff + (n - 1) * 7;\n return new Date(Date.UTC(year, month - 1, day));\n } else {\n // From end of month (n = -1 = last)\n // month is 1-12. Date.UTC(year, month, 0) gives the last day of month 'month'\n const last = new Date(Date.UTC(year, month, 0));\n const lastWeekday = last.getUTCDay();\n const diff = (lastWeekday - weekday + 7) % 7;\n const day = last.getUTCDate() - diff + (n + 1) * 7;\n return new Date(Date.UTC(year, month - 1, day));\n }\n}\n","import type { ShiftRule } from '../types';\n\n/**\n * Applies a shift rule to a date\n * @returns { date: Date, shifted: boolean }\n */\nexport function applyShift(date: Date, rule: ShiftRule): { date: Date; shifted: boolean } {\n const day = date.getUTCDay(); // 0=Sun, 6=Sat\n\n if (rule === 'none') {\n return { date, shifted: false };\n }\n\n const result = new Date(date);\n\n switch (rule) {\n case 'emiliani':\n case 'nextMonday': {\n // If it's already Monday (1), do not move\n if (day === 1) {\n return { date, shifted: false };\n }\n // Move to next Monday\n // (8 - day) % 7 gives days until next Monday\n // Ex: Sun(0) -> (8-0)%7 = 1 (+1 day) -> Mon\n // Ex: Sat(6) -> (8-6)%7 = 2 (+2 days) -> Mon\n // Ex: Wed(3) -> (8-3)%7 = 5 (+5 days) -> Mon\n const daysToNextMonday = (8 - day) % 7;\n result.setUTCDate(date.getUTCDate() + daysToNextMonday);\n break;\n }\n\n case 'observedUS':\n // Only affects weekends\n if (day === 0) {\n // Sunday -> Monday (+1)\n result.setUTCDate(date.getUTCDate() + 1);\n } else if (day === 6) {\n // Saturday -> Friday (-1)\n result.setUTCDate(date.getUTCDate() - 1);\n } else {\n return { date, shifted: false };\n }\n break;\n\n case 'nearestMonday':\n // Argentina rule:\n // Tue/Wed -> Previous Monday\n // Thu/Fri -> Next Monday\n if (day === 2) {\n // Tuesday -> Monday (-1)\n result.setUTCDate(date.getUTCDate() - 1);\n } else if (day === 3) {\n // Wednesday -> Monday (-2)\n result.setUTCDate(date.getUTCDate() - 2);\n } else if (day === 4) {\n // Thursday -> Next Monday (+4)\n result.setUTCDate(date.getUTCDate() + 4);\n } else if (day === 5) {\n // Friday -> Next Monday (+3)\n result.setUTCDate(date.getUTCDate() + 3);\n } else {\n return { date, shifted: false };\n }\n break;\n\n default:\n return { date, shifted: false };\n }\n\n return { date: result, shifted: true };\n}\n","import type { HolidayDefinition, HolidayRule, Holiday } from './types';\nimport { getEasterSunday } from './algorithms/easter';\nimport { getNthWeekday } from './algorithms/nth-weekday';\nimport { applyShift } from './algorithms/shifts';\n\n/** Resolves a rule to a concrete date */\nfunction resolveRule(rule: HolidayRule, year: number): Date | null {\n switch (rule.type) {\n case 'fixed':\n return new Date(Date.UTC(year, rule.month - 1, rule.day));\n\n case 'nthWeekday':\n return getNthWeekday(year, rule.month, rule.weekday, rule.n);\n\n case 'easterRelative': {\n const easter = getEasterSunday(year);\n const result = new Date(easter);\n result.setUTCDate(easter.getUTCDate() + rule.offset);\n return result;\n }\n\n case 'custom':\n return rule.calc(year);\n }\n}\n\n/** Formats Date to ISO string (date only) */\nfunction toISODate(date: Date): string {\n return date.toISOString().split('T')[0];\n}\n\n/** Generates holidays for a year */\nexport function resolveHolidays(\n definitions: HolidayDefinition[],\n year: number,\n names: Record = {},\n): Holiday[] {\n return definitions\n .map((def) => {\n const rawDate = resolveRule(def.rule, year);\n if (!rawDate) return null;\n\n const { date, shifted } = applyShift(rawDate, def.shift ?? 'none');\n\n return {\n date: toISODate(date),\n key: def.key,\n name: names[def.key] ?? def.key,\n ...(shifted && { isShifted: true }),\n };\n })\n .filter((h): h is Holiday => h !== null)\n .sort((a, b) => a.date.localeCompare(b.date));\n}\n\n/** Checks if a date is a holiday */\nexport function checkIsHoliday(\n definitions: HolidayDefinition[],\n date: Date,\n names?: Record,\n): Holiday | null {\n const year = date.getUTCFullYear();\n const isoDate = toISODate(date);\n const holidays = resolveHolidays(definitions, year, names);\n return holidays.find((h) => h.date === isoDate) ?? null;\n}\n\n/** Gets the next holiday from a date */\nexport function findNextHoliday(\n definitions: HolidayDefinition[],\n from: Date,\n names?: Record,\n): Holiday | null {\n const isoFrom = toISODate(from);\n const year = from.getUTCFullYear();\n\n // Search in current year\n let holidays = resolveHolidays(definitions, year, names);\n let next = holidays.find((h) => h.date >= isoFrom);\n\n // If none, search in next year\n if (!next) {\n holidays = resolveHolidays(definitions, year + 1, names);\n next = holidays[0];\n }\n\n return next ?? null;\n}\n","import type { HolidayDefinition } from './types';\nimport { checkIsHoliday } from './engine';\n\n/**\n * Checks if a date is a weekend (Saturday or Sunday)\n * Uses UTC date to avoid timezone issues\n */\nexport function isWeekend(date: Date): boolean {\n const day = date.getUTCDay();\n return day === 0 || day === 6; // 0 = Sunday, 6 = Saturday\n}\n\n/**\n * Checks if a date is a business day (not weekend AND not holiday)\n */\nexport function checkIsBusinessDay(definitions: HolidayDefinition[], date: Date): boolean {\n if (isWeekend(date)) return false;\n return checkIsHoliday(definitions, date) === null;\n}\n\n/**\n * Adds (or subtracts) business days to a date\n */\nexport function addBusinessDays(\n definitions: HolidayDefinition[],\n startDate: Date,\n amount: number,\n): Date {\n const result = new Date(startDate);\n let remaining = Math.abs(amount);\n const direction = amount >= 0 ? 1 : -1;\n\n while (remaining > 0) {\n result.setUTCDate(result.getUTCDate() + direction);\n if (checkIsBusinessDay(definitions, result)) {\n remaining--;\n }\n }\n\n return result;\n}\n"]}