Javascript 如何使用日期fns查找一周中最近的一天

我希望能够根据当前日期和日期fns找出过去一周中最近的一天。假设我需要根据当前日期查找过去最近的星期五、星期三、星期四等

我查阅了文档，只能看到这两种方法，我认为这可能会有所帮助，但我正在寻找的方法却不见了

有什么想法吗

const { getISODay, addDays } = require('date-fns');

function getClosestDayOfLastWeek(dayOfWeek, fromDate = new Date()) {
    // follow the getISODay format (7 for Sunday, 1 for Monday)
    const dayOfWeekMap = {
        Mon: 1,
        Tue: 2,
        Wed: 3,
        Thur: 4,
        Fri: 5,
        Sat: 6,
        Sun: 7,
    };

    // -7 means last week
    // dayOfWeekMap[dayOfWeek] get the ISODay for the desired dayOfWeek

    // e.g. If today is Sunday, getISODay(fromDate) will returns 7
    // if the day we want to find is Thursday(4), apart from subtracting one week(-7),
    // we also need to account for the days between Sunday(7) and Thursday(4)
    // Hence we need to also subtract (getISODay(fromDate) - dayOfWeekMap[dayOfWeek])
    const offsetDays = -7 - (getISODay(fromDate) - dayOfWeekMap[dayOfWeek]);

    return addDays(fromDate, offsetDays);
}

console.log(getClosestDayOfLastWeek('Mon'));