150 lines
6.8 KiB
Markdown
150 lines
6.8 KiB
Markdown
# watchpack
|
|
|
|
Wrapper library for directory and file watching.
|
|
|
|
[![Build Status][build-status]][build-status-url]
|
|
[![Build status][build-status-veyor]][build-status-veyor-url]
|
|
[![Test coverage][coveralls-image]][coveralls-url]
|
|
[![codecov][codecov]][codecov-url]
|
|
[![downloads][downloads]][downloads-url]
|
|
[![Github contributors][contributors]][contributors-url]
|
|
|
|
## Concept
|
|
|
|
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.
|
|
|
|
- The high level API requests `DirectoryWatchers` from a `WatcherManager`, which ensures that only a single `DirectoryWatcher` per directory is created.
|
|
- A user-faced `Watcher` can be obtained from a `DirectoryWatcher` and provides a filtered view on the `DirectoryWatcher`.
|
|
- Reference-counting is used on the `DirectoryWatcher` and `Watcher` to decide when to close them.
|
|
- The real watchers are created by the `DirectoryWatcher`.
|
|
- Files are never watched directly. This should keep the watcher count low.
|
|
- Watching can be started in the past. This way watching can start after file reading.
|
|
- Symlinks are not followed, instead the symlink is watched.
|
|
|
|
## API
|
|
|
|
```javascript
|
|
var Watchpack = require("watchpack");
|
|
|
|
var wp = new Watchpack({
|
|
// options:
|
|
aggregateTimeout: 1000,
|
|
// fire "aggregated" event when after a change for 1000ms no additional change occurred
|
|
// aggregated defaults to undefined, which doesn't fire an "aggregated" event
|
|
|
|
poll: true,
|
|
// poll: true - use polling with the default interval
|
|
// poll: 10000 - use polling with an interval of 10s
|
|
// poll defaults to undefined, which prefer native watching methods
|
|
// Note: enable polling when watching on a network path
|
|
// When WATCHPACK_POLLING environment variable is set it will override this option
|
|
|
|
followSymlinks: true,
|
|
// true: follows symlinks and watches symlinks and real files
|
|
// (This makes sense when symlinks has not been resolved yet, comes with a performance hit)
|
|
// false (default): watches only specified item they may be real files or symlinks
|
|
// (This makes sense when symlinks has already been resolved)
|
|
|
|
ignored: "**/.git"
|
|
// ignored: "string" - a glob pattern for files or folders that should not be watched
|
|
// ignored: ["string", "string"] - multiple glob patterns that should be ignored
|
|
// ignored: /regexp/ - a regular expression for files or folders that should not be watched
|
|
// ignored: (entry) => boolean - an arbitrary function which must return truthy to ignore an entry
|
|
// For all cases expect the arbitrary function the path will have path separator normalized to '/'.
|
|
// All subdirectories are ignored too
|
|
});
|
|
|
|
// Watchpack.prototype.watch({
|
|
// files: Iterable<string>,
|
|
// directories: Iterable<string>,
|
|
// missing: Iterable<string>,
|
|
// startTime?: number
|
|
// })
|
|
wp.watch({
|
|
files: listOfFiles,
|
|
directories: listOfDirectories,
|
|
missing: listOfNotExistingItems,
|
|
startTime: Date.now() - 10000
|
|
});
|
|
// starts watching these files and directories
|
|
// calling this again will override the files and directories
|
|
// files: can be files or directories, for files: content and existence changes are tracked
|
|
// for directories: only existence and timestamp changes are tracked
|
|
// directories: only directories, directory content (and content of children, ...) and
|
|
// existence changes are tracked.
|
|
// assumed to exist, when directory is not found without further information a remove event is emitted
|
|
// missing: can be files or directorees,
|
|
// only existence changes are tracked
|
|
// expected to not exist, no remove event is emitted when not found initially
|
|
// files and directories are assumed to exist, when they are not found without further information a remove event is emitted
|
|
// missing is assumed to not exist and no remove event is emitted
|
|
|
|
wp.on("change", function(filePath, mtime, explanation) {
|
|
// filePath: the changed file
|
|
// mtime: last modified time for the changed file
|
|
// explanation: textual information how this change was detected
|
|
});
|
|
|
|
wp.on("remove", function(filePath, explanation) {
|
|
// filePath: the removed file or directory
|
|
// explanation: textual information how this change was detected
|
|
});
|
|
|
|
wp.on("aggregated", function(changes, removals) {
|
|
// changes: a Set of all changed files
|
|
// removals: a Set of all removed files
|
|
// watchpack gives up ownership on these Sets.
|
|
});
|
|
|
|
// Watchpack.prototype.pause()
|
|
wp.pause();
|
|
// stops emitting events, but keeps watchers open
|
|
// next "watch" call can reuse the watchers
|
|
// The watcher will keep aggregating events
|
|
// which can be received with getAggregated()
|
|
|
|
// Watchpack.prototype.close()
|
|
wp.close();
|
|
// stops emitting events and closes all watchers
|
|
|
|
// Watchpack.prototype.getAggregated(): { changes: Set<string>, removals: Set<string> }
|
|
const { changes, removals } = wp.getAggregated();
|
|
// returns the current aggregated info and removes that from the watcher
|
|
// The next aggregated event won't include that info and will only emitted
|
|
// when futher changes happen
|
|
// Can also be used when paused.
|
|
|
|
// Watchpack.prototype.collectTimeInfoEntries(fileInfoEntries: Map<string, Entry>, directoryInfoEntries: Map<string, Entry>)
|
|
wp.collectTimeInfoEntries(fileInfoEntries, directoryInfoEntries);
|
|
// collects time info objects for all known files and directories
|
|
// this include info from files not directly watched
|
|
// key: absolute path, value: object with { safeTime, timestamp }
|
|
// safeTime: a point in time at which it is safe to say all changes happened before that
|
|
// timestamp: only for files, the mtime timestamp of the file
|
|
|
|
// Watchpack.prototype.getTimeInfoEntries()
|
|
var fileTimes = wp.getTimeInfoEntries();
|
|
// returns a Map with all known time info objects for files and directories
|
|
// similar to collectTimeInfoEntries but returns a single map with all entries
|
|
|
|
// (deprecated)
|
|
// Watchpack.prototype.getTimes()
|
|
var fileTimes = wp.getTimes();
|
|
// returns an object with all known change times for files
|
|
// this include timestamps from files not directly watched
|
|
// key: absolute path, value: timestamp as number
|
|
```
|
|
|
|
[build-status]: https://travis-ci.org/webpack/watchpack.svg?branch=main
|
|
[build-status-url]: https://travis-ci.org/webpack/watchpack
|
|
[build-status-veyor]: https://ci.appveyor.com/api/projects/status/e5u2qvmugtv0r647/branch/main?svg=true
|
|
[build-status-veyor-url]: https://ci.appveyor.com/project/sokra/watchpack/branch/main
|
|
[coveralls-url]: https://coveralls.io/r/webpack/watchpack/
|
|
[coveralls-image]: https://img.shields.io/coveralls/webpack/watchpack.svg
|
|
[codecov]: https://codecov.io/gh/webpack/watchpack/branch/main/graph/badge.svg
|
|
[codecov-url]: https://codecov.io/gh/webpack/watchpack
|
|
[downloads]: https://img.shields.io/npm/dm/watchpack.svg
|
|
[downloads-url]: https://www.npmjs.com/package/watchpack
|
|
[contributors]: https://img.shields.io/github/contributors/webpack/watchpack.svg
|
|
[contributors-url]: https://github.com/webpack/watchpack/graphs/contributors
|