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gaze

A globbing fs.watch wrapper built from the best parts of other fine watch libs.
Compatible with Node.js >= 4.x, Windows, macOS, and Linux.

Usage

Install the module with: npm install gaze or place into your package.json and run npm install.

var gaze = require('gaze');

// Watch all .js files/dirs in process.cwd()
gaze('**/*.js', function(err, watcher) {
  // Files have all started watching
  // watcher === this

  // Get all watched files
  var watched = this.watched();

  // On file changed
  this.on('changed', function(filepath) {
    console.log(filepath + ' was changed');
  });

  // On file added
  this.on('added', function(filepath) {
    console.log(filepath + ' was added');
  });

  // On file deleted
  this.on('deleted', function(filepath) {
    console.log(filepath + ' was deleted');
  });

  // On changed/added/deleted
  this.on('all', function(event, filepath) {
    console.log(filepath + ' was ' + event);
  });

  // Get watched files with relative paths
  var files = this.relative();
});

// Also accepts an array of patterns
gaze(['stylesheets/*.css', 'images/**/*.png'], function() {
  // Add more patterns later to be watched
  this.add(['js/*.js']);
});

Alternate Interface

var Gaze = require('gaze').Gaze;

var gaze = new Gaze('**/*');

// Files have all started watching
gaze.on('ready', function(watcher) { });

// A file has been added/changed/deleted has occurred
gaze.on('all', function(event, filepath) { });

Errors

gaze('**/*', function(error, watcher) {
  if (error) {
    // Handle error if it occurred while starting up
  }
});

// Or with the alternative interface
var gaze = new Gaze();
gaze.on('error', function(error) {
  // Handle error here
});
gaze.add('**/*');

Minimatch / Glob

See isaacs's minimatch for more information on glob patterns.

Documentation

gaze([patterns, options, callback])

patterns {String|Array} File patterns to be matched
options {Object}
callback {Function}
- err {Error | null}
- watcher {Object} Instance of the Gaze watcher

Class: `gaze.Gaze`

Create a Gaze object by instancing the gaze.Gaze class.

var Gaze = require('gaze').Gaze;
var gaze = new Gaze(pattern, options, callback);

Properties

options The options object passed in.
- interval {integer} Interval to pass to fs.watchFile
- debounceDelay {integer} Delay for events called in succession for the same file/event in milliseconds
- mode {string} Force the watch mode. Either 'auto' (default), 'watch' (force native events), or 'poll' (force stat polling).
- cwd {string} The current working directory to base file patterns from. Default is process.cwd().

Events

ready(watcher) When files have been globbed and watching has begun.
all(event, filepath) When an added, changed, renamed, or deleted event occurs.
added(filepath) When a file has been added to a watch directory.
changed(filepath) When a file has been changed.
deleted(filepath) When a file has been deleted.
renamed(newPath, oldPath) When a file has been renamed.
end() When the watcher is closed and watches have been removed.
error(err) When an error occurs.
nomatch When no files have been matched.

Methods

emit(event, [...]) Wrapper for EventEmitter.emit. added|changed|renamed|deleted events will also trigger the all event.
close() Unwatch all files and reset the watch instance.
add(patterns, callback) Adds file(s) patterns to be watched.
remove(filepath) Removes a file or directory from being watched. Does not recurse directories.
watched() Returns the currently watched files.
relative([dir, unixify]) Returns the currently watched files with relative paths.
- dir {string} Only return relative files for this directory.
- unixify {boolean} Return paths with / instead of \\ if on Windows.

Similar Projects

Other great watch libraries to try are:

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using grunt.

Release History

1.1.3 - Fix for Node 10 support (@aredridel). Officially dropping support for Node < 4.
1.1.2 - Prevent more ENOENT errors from escaping (@alexgorbatchev).
1.1.1 - Prevent fs.watch errors from escaping error handler (@rosen-vladimirov). Fix _addToWatched without path.sep (@wyicwx).
1.1.0 - Update to globule@1.0.0 with minimatch >= 3.0.0.
1.0.0 - Revert back to 0.5.2. Drop support for Node.js v0.8. Fix for maxListeners. Update globule to 0.2.0.
0.6.4 - Catch and emit error from readdir (@oconnore). Fix for 0 maxListeners. Use graceful-fs to avoid EMFILE errors in other places fs is used. Better method to determine if pathwatcher was built. Fix keeping process alive too much, only init pathwatcher if a file is being watched. Set min required to Windows Vista when building on Windows (@pvolok).
0.6.3 - Add support for Node.js v0.11
0.6.2 - Fix argument error with watched(). Fix for erroneous added events on folders. Ignore msvs build error 4244.
0.6.1 - Fix for absolute paths.
0.6.0 - Uses native OS events (fork of pathwatcher) but can fall back to stat polling. Everything is async to avoid blocking, including relative() and watched(). Better error handling. Update to globule@0.2.0. No longer watches cwd by default. Added mode option. Better EMFILE message. Avoids ENOENT errors with symlinks. All constructor arguments are optional.
0.5.2 - Fix for ENOENT error with non-existent symlinks [BACKPORTED].
0.5.1 - Use setImmediate (process.nextTick for Node.js v0.8) to defer ready/nomatch events (@amasad).
0.5.0 - Process is now kept alive while watching files. Emits a nomatch event when no files are matching.
0.4.3 - Track file additions in newly created folders (@brett-shwom).
0.4.2 - Fix .remove() method to remove a single file in a directory (@kaelzhang). Fixing “Cannot call method 'call' of undefined” (@krasimir). Track new file additions within folders (@brett-shwom).
0.4.1 - Fix watchDir not respecting close in race condition (@chrisirhc).
0.4.0 - Drop support for Node.js v0.6. Use globule for file matching. Avoid Node.js v0.10 path.resolve/join errors. Register new files when added to non-existent folder. Multiple instances can now poll the same files (@jpommerening).
0.3.4 - Code clean up. Fix “path must be strings” errors (@groner). Fix incorrect added events (@groner).
0.3.3 - Fix for multiple patterns with negate.
0.3.2 - Emit end before removeAllListeners.
0.3.1 - Fix added events within subfolder patterns.
0.3.0 - Handle safewrite events, forceWatchMethod option removed, bug fixes and watch optimizations (@rgaskill).
0.2.2 - Fix issue where subsequent add calls dont get watched (@samcday). removeAllListeners on close.
0.2.1 - Fix issue with invalid added events in current working dir.
0.2.0 - Support and mark folders with path.sep. Add forceWatchMethod option. Support renamed events.
0.1.6 - Recognize the cwd option properly
0.1.5 - Catch “too many open file” errors
0.1.4 - Really fix the race condition with 2 watches
0.1.3 - Fix race condition with 2 watches
0.1.2 - Read triggering changed event fix
0.1.1 - Minor fixes
0.1.0 - Initial release

README.md