Creates a map that groups weeks of the year by month, like `[0: [1,2,3,4], 1:[5,6,7,8], 2: [9,10,11,12,13],,]`

weekByMonthMap

export const getWeekNumbersForYear = year => {
    const date = dayjs(`${year}-01-01`)
    const numberOfWeek = date.isoWeeksInYear()
    const arrayOfWeekWithFirstDay = []

    for (let week = 1; week <= numberOfWeek; week += 1) {
        const day = dayjs().year(year).isoWeek(week).day(1)

        arrayOfWeekWithFirstDay.push({
            weekNumber: week,
            startDay: day.format('YYYY-MM-DD')
        })
    }

    const result = new Array(12).fill(null).map(_ => [])

    arrayOfWeekWithFirstDay.forEach((item, index) => {
        const month = dayjs(item.startDay).month()
        if (index === 0 && month === 12) {
            result[0].push(item.weekNumber)
        } else {
            result[month].push(item.weekNumber)
        }
    })

    return result
}