在不使用外部包和尾部-f的情况下，如何使用node.js继续查看大型日志文件并输出最后10行？

const fs = require('fs');

function readLastLines(filePath, numLines) {
  const bufferSize = 1024;
  const buffer = Buffer.alloc(bufferSize);
  const fileDescriptor = fs.openSync(filePath, 'r');
  let bytesRead, linesCount, lastLines;

  try {
    const fileSize = fs.statSync(filePath).size;
    let position = fileSize - bufferSize;

    while (position > 0) {
      bytesRead = fs.readSync(fileDescriptor, buffer, 0, bufferSize, position);
      linesCount = buffer.slice(0, bytesRead).toString().match(/\n/g).length;
      
      if (linesCount >= numLines) {
        lastLines = buffer.slice(bytesRead - numLines, bytesRead).toString();
        break;
      }
      
      position -= bufferSize;
    }

    if (!lastLines) {
      bytesRead = fs.readSync(fileDescriptor, buffer, 0, fileSize, 0);
      lastLines = buffer.slice(0, bytesRead).toString();
    }
  } finally {
    fs.closeSync(fileDescriptor);
  }

  return lastLines;
}

const filePath = 'path/to/your/log/file.log';
const numLines = 10;

const lastLines = readLastLines(filePath, numLines);
console.log(lastLines);