将文件读取流传递到Node.js中的readline.createInterface时读取整个文件

我正在一个大文件上创建一个文件读取流，并将其传递给

readline.createInterface

。目标是，在此之后，使用

等待。。。从文件中获取行而不将其全部读取到内存

然而，即使我没有读任何东西，整个流似乎都在被处理。我知道发生这种情况是因为我试图监听事件（它们被发出），而且如果我使用一个非常大的文件，我的脚本需要一段时间才能完成

有没有办法避免这种行为？我希望该流能够按需使用

如果我不使用
readline
，而是从流中读取块并自己搜索行，我可以成功地实现此行为，但如果可能，我希望避免这种情况

MWE：

从
readline
package的官方文件：

const fs = require('fs');
const readline = require('readline');

async function processLineByLine() {
  const fileStream = fs.createReadStream('/tmp/input.txt');
  // If you want to start consuming the stream after some point
  // in time then try adding the open even to the readstream
  // and explictly pause it
  fileStream.on('open', () => {
    fileStream.pause();


    // Then resume the stream when you want to start the data flow
    setInterval(() => {
      fileStream.resume();
    }, 1000)
  });

  const rl = readline.createInterface({
    input: fileStream,
    crlfDelay: Infinity
  });
  // Note: we use the crlfDelay option to recognize all instances of CR LF
  // ('\r\n') in input.txt as a single line break.

  for await (const line of rl) {
    // Each line in input.txt will be successively available here as `line`.
    console.log(`Line from file: ${line}`);
  }

  console.log("reading finished");
}

processLineByLine();

尝试将接口存储在变量中，并在迭代中进一步使用它。这里发生的事情是readline开始并继续，直到没有任何东西要求它等待

进一步阅读：

const fs = require('fs');
const readline = require('readline');

async function processLineByLine() {
  const fileStream = fs.createReadStream('/tmp/input.txt');
  // If you want to start consuming the stream after some point
  // in time then try adding the open even to the readstream
  // and explictly pause it
  fileStream.on('open', () => {
    fileStream.pause();


    // Then resume the stream when you want to start the data flow
    setInterval(() => {
      fileStream.resume();
    }, 1000)
  });

  const rl = readline.createInterface({
    input: fileStream,
    crlfDelay: Infinity
  });
  // Note: we use the crlfDelay option to recognize all instances of CR LF
  // ('\r\n') in input.txt as a single line break.

  for await (const line of rl) {
    // Each line in input.txt will be successively available here as `line`.
    console.log(`Line from file: ${line}`);
  }

  console.log("reading finished");
}

processLineByLine();