Node.js 管道输出超出通孔2

我第一次尝试通过2，我遇到了一些麻烦。我正在通过一系列流处理数据，我想通过管道输出我的转换函数

文档说我应该使用

this.push

从我的转换函数中获取数据，然后在完成后调用回调，所以我尝试使用管道来实现这一点（因为这应该做同样的事情，对吗？），但我得到了writeAfterEnd错误。下面是我的代码和stacktrace，但我不知道该怎么做。有人能给我指出正确的方向吗

代码-

function run(chunk, encoding, callback) {
    this.on("finish", function(){
        console.log("this finished")
        callback()
    })
    dataStream = new stream.Readable({objectMode: true});
    dataStream._read = function noop(){};
    dataStream.push(chunk);
    dataStream.pipe(sass()).pipe(this)
}

gulp.src("./web-src/scss/add_post.scss").pipe(through.obj(run)).on('data', function(chunk){console.log(chunk)})

Stacktrace-

events.js:85
      throw er; // Unhandled 'error' event
            ^
Error: write after end
    at writeAfterEnd (/Volumes/BackRoom/Dropbox/Timpani/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:198:12)
    at DestroyableTransform.Writable.write (/Volumes/BackRoom/Dropbox/Timpani/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:243:5)
    at write (/Volumes/BackRoom/Dropbox/Timpani/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:623:24)
    at flow (/Volumes/BackRoom/Dropbox/Timpani/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:632:7)
    at DestroyableTransform.pipeOnReadable (/Volumes/BackRoom/Dropbox/Timpani/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:664:5)
    at DestroyableTransform.emit (events.js:104:17)
    at emitReadable_ (/Volumes/BackRoom/Dropbox/Timpani/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:448:10)
    at emitReadable (/Volumes/BackRoom/Dropbox/Timpani/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:444:5)
    at readableAddChunk (/Volumes/BackRoom/Dropbox/Timpani/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:187:9)
    at DestroyableTransform.Readable.push (/Volumes/BackRoom/Dropbox/Timpani/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:149:10)

---

您是在实现流还是仅仅使用through2

流使用者正在使用.push（）

错误：如果chunk==null，“流实现器API”将其解释为EOF，则可能在结束后写入