将ReadStream值写入数组

我正在尝试使用流和async,await关键字,使用fast csv lib同步读取csv。

但是,我的函数似乎没有返回所需的输出。我的猜测是,我编写的函数中的函数/流所用的时间比node考虑生成我的console.log 用于输出数组长度的函数。

我怎么退票 output 包含从csv流读取的所有值的数组?

// CSV Processing
async function readCsv(csvfilepath) {
    var output = []
    var stream = fs.ReadStream(csvfilepath)
    var parser = csv.fromStream(stream, {
        headers: true
    }).on("data", function (data) {
        parser.pause()
        t(data, output, function (err) {
            // TODO: handle error
            parser.resume()
        });
    }).on("end", function () {
        console.log(output) // outputs desired array with objects
        console.log(output.length) // length is 100
        // return output // does not work. output == [].
    });


    var t = (data, out, callback) => {
        out.push(data) // push the objects to that array
        callback()
    }

    console.log(output.length) // says length = 0
    return output // output is empty, should be filled with values exactly like in the 'end' event from the stream
}