How to use the watchFile function from fs-extra

Find comprehensive JavaScript fs-extra.watchFile code examples handpicked from public code repositorys.

fs-extra.watchFile is a method that watches a file for changes and executes a callback function when the file is modified.

nodejs.md?plain=1

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- fs.symlink()：创建指向文件的新符号链接
- fs.truncate()：将传递的文件名标识的文件截断为指定的长度。有关：fs.ftruncate()
- fs.unlink()：删除文件或符号链接
- fs.unwatchFile()：停止监视文件上的更改
- fs.utimes()：更改通过传递的文件名标识的文件的时间戳。有关：fs.futimes()
- fs.watchFile()：开始监视文件上的更改。有关：fs.watch()
- fs.writeFile()：将数据写入文件。有关：fs.write()

当然这些api默认都是异步的，如果想要使用同步方式只需在方法名后追加Sync即可，而且同步方式需要使用try..catch方式捕获错误，还会阻塞主线程执行

+ 13 other calls in file

template.js

GitHub: wk-js/starter-nanogl

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  pth = path.resolve(path.dirname(this.options.filename), pth)
  return require(pth)
}

watch(child, parent) {
  fs.watchFile(child, { interval: 300 }, (curr, prev) => {
    if (curr.mtime > prev.mtime) {
      fs.open(parent, 0, function(err, fd) {
        if (err) return console.log(err)

How does fs-extra.watchFile work?

fs-extra.watchFile is a method provided by the fs-extra module in Node.js that watches for changes in a file or directory and invokes a callback function whenever the file or directory changes. It works by periodically polling the file or directory to check if its modification time or size has changed and triggering the callback if a change is detected.

client.js

GitHub: prabathLK/PRABATH-MD

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//=============================[to get message of New Update of this file.]===================================================

let file = require.resolve(__filename)

fs.watchFile(file, () => {

    fs.unwatchFile(file)

    console.log(`Update ${__filename}`)

+ 19 other calls in file

parser.js

GitHub: teyhd/StudyAdviser

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var lesname = ""
for (let i = 0; i < files.length; i++) {
 //lesname += readall(files[i])
}


/*let file = fs.watchFile(path.join(appDir,"reports"), (curr, prev) => {
  console.log(`Current modified time: ${curr.mtime}`);
  console.dir(curr);
  console.log(`Previous modified time: ${prev.mtime}`);
});*/

Ai Example

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const fs = require("fs-extra");

fs.watchFile("/path/to/file", (curr, prev) => {
  console.log("The current modification timestamp is: ", curr.mtime);
  console.log("The previous modification timestamp was: ", prev.mtime);
});

This will watch the file at /path/to/file for changes and log the modification timestamps when the file is modified.

webpack.config.js

GitHub: charles37/nanoGPThs

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}
const source = fs.realpathSync(path.join(jlab.linkedPackages[name], rest));
if (source === fs.realpathSync(localPath)) {
  return;
}
fs.watchFile(source, { interval: 500 }, function (curr) {
  if (!curr || curr.nlink === 0) {
    return;
  }
  try {

+ 17 other calls in file

cli-utils.js

GitHub: ds-sampaio/ClicouChegouApp

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exports.watchFile =
  /*#__PURE__*/
  (function() {
    var _ref = _asyncToGenerator(function*(filename, callback) {
      fs.watchFile(filename, () => {
        callback();
      });
      yield callback();
    });

+ 9 other calls in file

formattedTSDemos.js

GitHub: Vladislav-cloud/UI-fork

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  }
  return;
}

tsxFiles.forEach((filePath) => {
  fse.watchFile(filePath, { interval: 500 }, async () => {
    if ((await transpileFile(filePath, program, true)) === 0) {
      console.log('Success - %s', filePath);
    }
  });

+ 3 other calls in file

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