如何防止end消息关闭Nodejs流？

const fs = require('fs');

const stream = fs.createReadStream('file.txt');

stream.on('readable', () => {
  let chunk;
  while ((chunk = stream.read()) !== null) {
    // 处理读取到的数据
    console.log(chunk.toString());
  }
});

const fs = require('fs');

const stream = fs.createReadStream('file.txt');

stream.pause();

// 在需要继续读取数据的地方调用 stream.resume()
setTimeout(() => {
  stream.resume();
}, 5000);

const fs = require('fs');

const readableStream = fs.createReadStream('file.txt');
const writableStream = fs.createWriteStream('output.txt');

readableStream.pipe(writableStream);