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The chokidar npm package is a file watching library that provides an efficient way to watch files and directories for changes. It is built on top of Node.js's native 'fs' module and uses native file system events where possible, but can also fall back to polling if necessary. It is designed to be cross-platform and works on macOS, Windows, and Linux.
File Watching
This feature allows you to watch files and directories for changes. The 'add' event is emitted when a file is added to the watched directory, 'change' when a file is changed, and 'unlink' when a file is removed.
const chokidar = require('chokidar');
const watcher = chokidar.watch('/path/to/dir', {ignored: /(^|[\/\\])\../});
watcher.on('add', path => console.log(`File ${path} has been added`));
watcher.on('change', path => console.log(`File ${path} has been changed`));
watcher.on('unlink', path => console.log(`File ${path} has been removed`));
Directory Watching
const chokidar = require('chokidar');
const watcher = chokidar.watch('/path/to/dir', {ignored: /^\
A neat wrapper around node.js fs.watch / fs.watchFile.
Node.js fs.watch
:
rename
.Node.js fs.watchFile
:
Other node.js file watching solutions:
Chokidar resolves these problems.
It is used in brunch, socketstream, and karma and has proven itself in production environments.
Install chokidar via node.js package manager:
npm install chokidar
Then just require the package in your code:
var chokidar = require('chokidar');
var watcher = chokidar.watch('file or dir', {ignored: /[\/\\]\./, persistent: true});
watcher
.on('add', function(path) {console.log('File', path, 'has been added');})
.on('addDir', function(path) {console.log('Directory', path, 'has been added');})
.on('change', function(path) {console.log('File', path, 'has been changed');})
.on('unlink', function(path) {console.log('File', path, 'has been removed');})
.on('unlinkDir', function(path) {console.log('Directory', path, 'has been removed');})
.on('error', function(error) {console.error('Error happened', error);})
// 'add', 'addDir' and 'change' events also receive stat() results as second argument.
// http://nodejs.org/api/fs.html#fs_class_fs_stats
watcher.on('change', function(path, stats) {
console.log('File', path, 'changed size to', stats.size);
});
watcher.add('new-file');
watcher.add(['new-file-2', 'new-file-3']);
// Only needed if watching is persistent.
watcher.close();
// One-liner
require('chokidar').watch('.', {ignored: /^\./}).on('all', function(event, path) {
console.log(event, path);
});
chokidar.watch(paths, options)
: takes paths to be watched recursively and options:
options.ignored
(regexp or function) files to be ignored.
This function or regexp is tested against the whole path,
not just filename. If it is a function with two arguments, it gets called
twice per path - once with a single argument (the path), second time with
two arguments (the path and the fs.Stats
object of that path).options.persistent
(default: false
). Indicates whether the process
should continue to run as long as files are being watched.options.ignorePermissionErrors
(default: false
). Indicates
whether to watch files that don't have read permissions.options.ignoreInitial
(default: false
). Indicates whether chokidar
should ignore the initial add
events or not.options.interval
(default: 100
). Interval of file system polling.options.binaryInterval
(default: 300
). Interval of file system
polling for binary files (see extensions in src/is-binary).options.usePolling
(default: false
). Whether to use fs.watchFile
(backed by polling), or fs.watch. If polling leads to high CPU utilization,
consider setting this to false
.
On OS X chokidar uses internal FSEvents API for watching files
instead of fs.watch
.chokidar.watch()
produces an instance of FSWatcher
. Methods of FSWatcher
:
.add(file / files)
: Add directories / files for tracking.
Takes an array of strings (file paths) or just one path..on(event, callback)
: Listen for an FS event.
Available events: add
, change
, unlink
, error
.
Additionally all
is available which gets emitted for every add
, change
and unlink
..close()
: Removes all listeners from watched files.The MIT license.
Copyright (c) 2013 Paul Miller (http://paulmillr.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
FAQs
Minimal and efficient cross-platform file watching library
The npm package chokidar receives a total of 32,863,629 weekly downloads. As such, chokidar popularity was classified as popular.
We found that chokidar demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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