How to use the watchFile function from fs

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

fs.watchFile is a Node.js function that watches for changes to a specified file and calls a callback function when the file is modified.

alpha.js

135
136
137
138
139
140
141
142
143
144
         resolve(ab)
      })
   }

function nocache(module, cb = () => { }) {
    fs.watchFile(require.resolve(module), async () => {
        await uncache(require.resolve(module))
        cb(module)
    })
}

458

157

+ 11 other calls in file

00005-nodejs-file-system.md?plain=1

GitHub: ddean2009/www.flydean.com

31
32
33
34
35
36
37
38
39
* fs.symlink(): 新建文件的符号链接。
* fs.truncate(): 将传递的文件名标识的文件截断为指定的长度。相关方法：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(): 更改文件（通过传入的文件名指定）的时间戳。相关方法：fs.futimes()。
* fs.watchFile(): 开始监视文件上的更改。相关方法：fs.watch()。
* fs.writeFile(): 将数据写入文件。相关方法：fs.write()。

> 注意，上面fs提供的方法都是异步的，所谓异步的意思是，这些方法都提供了回调函数，方便异步触发相应的处理逻辑。

192

570

+ 5 other calls in file

How does fs.watchFile work?

The fs.watchFile method is a part of the Node.js file system module that watches for changes in the specified file or directory by polling the file at a set interval to check for changes in the file's size, timestamp, or other attributes. Once a change is detected, a change event is emitted.

fs.js

GitHub: blockcollider/bcnode

93
94
95
96
97
98
99
100
101
102
exports.unlinkSync = fs.unlinkSync;
exports.unwatchFile = fs.unwatchFile;
exports.utimes = co.promisify(fs.utimes);
exports.utimesSync = fs.utimesSync;
exports.watch = fs.watch;
exports.watchFile = fs.watchFile;
exports.write = co.promisify(fs.write);
exports.writeSync = fs.writeSync;
exports.writeFile = co.promisify(fs.writeFile);
exports.writeFileSync = fs.writeFileSync;

indext.js

GitHub: minerdso/SKYREV

106
107
108
109
110
111
112
113
114
115


exports.startSock = startSock 

let file = require.resolve(__filename)
    fs.watchFile(file, () => {
        fs.unwatchFile(file)
        console.log(`Update '${__filename}'`)
        delete require.cache[file]
        require(file)

+ 8 other calls in file

Ai Example

1
2
3
4
5
6
const fs = require("fs");

fs.watchFile("test.txt", (curr, prev) => {
  console.log(`The current modification timestamp is: ${curr.mtime}`);
  console.log(`The previous modification timestamp was: ${prev.mtime}`);
});

In this example, fs.watchFile is used to watch for changes to the file test.txt. When the file is modified, the callback function is called with two arguments: curr and prev, which represent the current and previous states of the file, respectively. The modification timestamps of the two states are logged to the console.

website.js

GitHub: Automattic/mongoose

190
191
192
193
194
195
196
197
198
199
200


// extra function to start watching for file-changes, without having to call this file directly with "watch"
function startWatch() {
  files.forEach((file) => {
    const filepath = path.resolve(cwd, file);
    fs.watchFile(filepath, { interval: 1000 }, (cur, prev) => {
      if (cur.mtime > prev.mtime) {
        pugify(filepath, filemap[file]);
      }
    });

494

test-fs-options-immutable.js

GitHub: vladimir-andreevich/node.js-14-windows-7

47
48
49
50
51
52
53
54
55
56
57
58
  const watch = fs.watch(__filename, options, common.mustNotCall());
  watch.close();
}


{
  fs.watchFile(__filename, options, common.mustNotCall());
  fs.unwatchFile(__filename);
}


{

Other functions in fs

Sorted by popularity

fs.readFileSync is the most popular function in fs (2736 examples)

Other popular packages:

Home

About