node-watch

fs.watch() wrapper of Nodejs

npm install node-watch
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Node-watch

A fs.watch wrapper to watch files or directories(recursively by default).

Installation

npm install node-watch

Example

var watch = require('node-watch');

watch('somedir_or_somefile', function(filename) {
  console.log(filename, ' changed.');
});

Why fs.watch wrapper

  • Some editors will generate temporary files which will cause the callback function to be triggered multiple times.
  • when watching a single file the callback function will only be triggered one time and then is seem to be unwatched.
  • Missing an option to watch a directory recursively.

The difference

This module currently does not differentiate event like rename or delete. Once there is a change, the callback function will be triggered.

Options

recursive:Watch it recursively or not (defaults to true).

followSymLinks: Follow symbolic links or not (defaults to false).

maxSymLevel: The max number of following symbolic links, in order to prevent circular links (defaults to 1).

watch('somedir', { recursive: false, followSymLinks: true }, function(filename) {
  console.log(filename, ' changed.');
});

FAQ

1. How to watch mutiple files or directories

watch(['file1', 'file2'], function(file) {
  //
});

2. How to filter files

Write your own filter function as a higher-order function. For example:

var filter = function(pattern, fn) {
  return function(filename) {
    if (pattern.test(filename)) {
      fn(filename);
    }
  }
}

// only watch for js files
watch('mydir', filter(/\.js$/, function(filename) {
  // 
}));
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