Nodejs check file exists, if not, wait till it exist

Question

I\'m generating files automatically, and I have another script which will check if a given file is already generated, so how could I implement such a function:

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Answer 1

function verifyFileDownload(extension) {
    browser.sleep(150000); //waiting for file to download
    const fs = require('fs');
    let os = require('os');
    var flag = true;
    console.log(os.userInfo());
    fs.readdir('/Users/' + require("os").userInfo().username + '/Downloads/', (error, file) => {
        if (error) {
            throw error;
        }
        console.log('File name' + file);
        for (var i = 0; i < file.length; i++) {
            const fileParts = file[i].split('.');
            const ext = fileParts[fileParts.length - 1];
            if (ext === extension) {
                flag = false;
            }
        }
        if (!flag) {
            return;
        }
        throw error;
    });
};