Node.js中如何使用chokidar监视文件变化并执行命令

本示例代码演示了如何使用chokidar监视指定文件夹中的文件变化，并在变化发生时执行指定的命令。使用了node.js的child_process模块来执行命令。

const chokidar = require('chokidar');
const { spawn } = require('child_process');

//需要监视的文件夹
const watchDir = './data';
//监视间隔时间
const watchInterval = 3000;
//需要执行的命令
const command = 'npm run build';

const watcher = chokidar.watch(watchDir, {
  ignored: /(^|[\/\\])\../, // ignore dotfiles
  persistent: true,
});

// All events will be called with `path` argument
watcher
  .on('add', (path) => {
    console.log(`File ${path} has been added`);
    executeCommand();
  })
  .on('change', (path) => {
    console.log(`File ${path} has been changed`);
    executeCommand();
  })
  .on('unlink', (path) => {
    console.log(`File ${path} has been removed`);
    executeCommand();
  })
  .on('error', (error) => {
    console.log(`Watcher error: ${error}`);
  });

//执行命令的函数
function executeCommand() {
  const parts = command.split(' ');
  const cmd = parts.shift();
  const args = parts;

  const spawnCmd = spawn(cmd, args, { stdio: 'inherit' });

  spawnCmd.on('close', (code) => {
    console.log(`child process exited with code ${code}`);
  });
}

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