check_holiday.js

const axios = require('axios')
const dayjs = require('dayjs')
const utc = require('dayjs/plugin/utc')
const timezone = require('dayjs/plugin/timezone')
const customHolidays = require('./custom_holidays')

dayjs.extend(utc)
dayjs.extend(timezone)

async function run() {
  try {
    const { data } = await axios.get('https://holidays-jp.github.io/api/v1/date.json')
    const holidays = [
      ...Object.keys(data),
      customHolidays
    ]
    if (holidays.includes(dayjs().tz('Asia/Tokyo').format('YYYY-MM-DD'))) {
      console.log('Today is holiday.')
      process.exit(1)
    } else {
      console.log('Today is not holiday.')
      process.exit(0)
    }
  } catch(e) {
    console.error(e)
    process.exit(1)
  }
}

run();