|
1
|
# watchpack
|
|
2
|
|
|
3
|
Wrapper library for directory and file watching.
|
|
4
|
|
|
5
|
[](https://travis-ci.org/webpack/watchpack) [](https://ci.appveyor.com/project/sokra/watchpack/branch/master) [![Test coverage][coveralls-image]][coveralls-url]
|
|
6
|
|
|
7
|
## Concept
|
|
8
|
|
|
9
|
watchpack high level API doesn't map directly to watchers. Instead a three level architecture ensures that for each directory only a single watcher exists.
|
|
10
|
|
|
11
|
* The high level API requests `DirectoryWatchers` from a `WatcherManager`, which ensures that only a single `DirectoryWatcher` per directory is created.
|
|
12
|
* A user-faced `Watcher` can be obtained from a `DirectoryWatcher` and provides a filtered view on the `DirectoryWatcher`.
|
|
13
|
* Reference-counting is used on the `DirectoryWatcher` and `Watcher` to decide when to close them.
|
|
14
|
* The real watchers (currently chokidar) are created by the `DirectoryWatcher`.
|
|
15
|
* Files are never watched directly. This should keep the watcher count low.
|
|
16
|
* Watching can be started in the past. This way watching can start after file reading.
|
|
17
|
* Symlinks are not followed, instead the symlink is watched.
|
|
18
|
|
|
19
|
## API
|
|
20
|
|
|
21
|
``` javascript
|
|
22
|
var Watchpack = require("watchpack");
|
|
23
|
|
|
24
|
var wp = new Watchpack({
|
|
25
|
// options:
|
|
26
|
aggregateTimeout: 1000
|
|
27
|
// fire "aggregated" event when after a change for 1000ms no additional change occurred
|
|
28
|
// aggregated defaults to undefined, which doesn't fire an "aggregated" event
|
|
29
|
|
|
30
|
poll: true
|
|
31
|
// poll: true - use polling with the default interval
|
|
32
|
// poll: 10000 - use polling with an interval of 10s
|
|
33
|
// poll defaults to undefined, which prefer native watching methods
|
|
34
|
// Note: enable polling when watching on a network path
|
|
35
|
|
|
36
|
ignored: /node_modules/,
|
|
37
|
// anymatch-compatible definition of files/paths to be ignored
|
|
38
|
// see https://github.com/paulmillr/chokidar#path-filtering
|
|
39
|
});
|
|
40
|
|
|
41
|
// Watchpack.prototype.watch(string[] files, string[] directories, [number startTime])
|
|
42
|
wp.watch(listOfFiles, listOfDirectories, Date.now() - 10000);
|
|
43
|
// starts watching these files and directories
|
|
44
|
// calling this again will override the files and directories
|
|
45
|
|
|
46
|
wp.on("change", function(filePath, mtime) {
|
|
47
|
// filePath: the changed file
|
|
48
|
// mtime: last modified time for the changed file
|
|
49
|
});
|
|
50
|
|
|
51
|
wp.on("aggregated", function(changes) {
|
|
52
|
// changes: an array of all changed files
|
|
53
|
});
|
|
54
|
|
|
55
|
// Watchpack.prototype.pause()
|
|
56
|
wp.pause();
|
|
57
|
// stops emitting events, but keeps watchers open
|
|
58
|
// next "watch" call can reuse the watchers
|
|
59
|
|
|
60
|
// Watchpack.prototype.close()
|
|
61
|
wp.close();
|
|
62
|
// stops emitting events and closes all watchers
|
|
63
|
|
|
64
|
// Watchpack.prototype.getTimes()
|
|
65
|
var fileTimes = wp.getTimes();
|
|
66
|
// returns an object with all know change times for files
|
|
67
|
// this include timestamps from files not directly watched
|
|
68
|
// key: absolute path, value: timestamp as number
|
|
69
|
```
|
|
70
|
|
|
71
|
[coveralls-url]: https://coveralls.io/r/webpack/watchpack/
|
|
72
|
[coveralls-image]: https://img.shields.io/coveralls/webpack/watchpack.svg
|