swedish-salary-day/lib/index.js

Calculate the next or previous salary payout date according to configured rules.

// Bundled with Packemon: https://packemon.dev
// Platform: browser, Support: stable, Format: lib
'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});

const seBankHolidays = require('se-bank-holidays'); // Config for which day


const defaultConfig = {
  dayOfMonth: 25,
  resolveSaturday: 'previous-work-day',
  resolveSunday: 'previous-work-day',
  isHoliday: seBankHolidays.isHoliday
};

function nextSalaryDay(referenceDate, config = defaultConfig) {
  if (typeof referenceDate === 'number') {
    // eslint-disable-next-line no-param-reassign
    referenceDate = new Date(referenceDate);
  }

  let salaryDay = new Date(referenceDate.getFullYear(), referenceDate.getMonth(), config.dayOfMonth + 1);
  salaryDay.setUTCMinutes(0);
  salaryDay.setUTCHours(0);

  if (referenceDate > salaryDay) {
    salaryDay.setMonth(salaryDay.getMonth() + 1);
    salaryDay.setUTCMinutes(0);
    salaryDay.setUTCHours(0);
  }

  salaryDay = setSalaryDay(salaryDay, config);
  return salaryDay;
}

function previousSalaryDay(referenceDate, config = defaultConfig) {
  if (typeof referenceDate === 'number') {
    // eslint-disable-next-line no-param-reassign
    referenceDate = new Date(referenceDate);
  }

  let salaryDay = new Date(referenceDate.getFullYear(), referenceDate.getMonth(), config.dayOfMonth + 1);
  salaryDay.setUTCMinutes(0);
  salaryDay.setUTCHours(0);

  if (referenceDate < salaryDay) {
    salaryDay.setMonth(salaryDay.getMonth() - 1);
    salaryDay.setUTCMinutes(0);
    salaryDay.setUTCHours(0);
  }

  salaryDay = setSalaryDay(salaryDay, config);
  return salaryDay;
}

const SATURDAY = 6;
const SUNDAY = 0;

function setSalaryDay(date, config) {
  const dayOfWeek = date.getDay();

  if (dayOfWeek === SATURDAY) {
    date.setDate(date.getDate() + (config.resolveSaturday === 'previous-work-day' ? -1 : 2));
  }

  if (dayOfWeek === SUNDAY) {
    date.setDate(date.getDate() + (config.resolveSunday === 'previous-work-day' ? -2 : 1));
  }

  if (config.isHoliday) {
    while (config.isHoliday(date)) {
      date.setDate(date.getDate() - 1);
    }
  }

  return date;
}

exports.nextSalaryDay = nextSalaryDay;
exports.previousSalaryDay = previousSalaryDay;
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