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+# 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