在读取所有数据之前异步/等待createReadStream结束: Node.js

const fs = require('fs');

function readStream(callback) {
  const stream = fs.createReadStream('file.txt');
  let data = '';

  stream.on('data', (chunk) => {
    data += chunk;
  });

  stream.on('end', () => {
    callback(null, data);
  });

  stream.on('error', (error) => {
    callback(error);
  });
}

readStream((error, data) => {
  if (error) {
    console.error('Error:', error);
  } else {
    console.log('Data:', data);
  }
});

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

const readFile = util.promisify(fs.readFile);

async function readStream() {
  try {
    const data = await readFile('file.txt');
    return data;
  } catch (error) {
    throw error;
  }
}

readStream()
  .then((data) => {
    console.log('Data:', data);
  })
  .catch((error) => {
    console.error('Error:', error);
  });