为什么我的readFileSync函数没有执行?[副本]

const cheerio = require('cheerio');

var fs = require('fs');
var path = process.argv[2];

var glossArr = []

fs.readFileSync(path, {encoding: "utf8"}, function (err, markup){
    console.log('function executing')
    if (err) throw err;
    const $ = cheerio.load(markup);
    var glossar = $('body').children().last();
    var index = $('body').children().last().prev();


    glossar.children().children().children().each(function(i, elem) {
    var obj = {};
        var container = $(this).children();

    var unter = container.children();
    var begriff = unter.first().text();
    var text = unter.last().text();
    obj[begriff] = text;
    obj['file'] = path;
    glossArr.push(obj)
    });    

});

console.log('done reading file...')

var glossString = JSON.stringify(glossArr)
var result = 'export default ' + glossString

fs.writeFileSync('./data/data.js', result)

然而,当我把它改为 readFile() (而不是同步),该函数按预期执行和工作。我错过了什么?