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-# watchpack
-
-Wrapper library for directory and file watching.
-
-[![Test](https://github.com/webpack/watchpack/actions/workflows/test.yml/badge.svg)](https://github.com/webpack/watchpack/actions/workflows/test.yml)
-[![Codecov](https://codecov.io/gh/webpack/watchpack/graph/badge.svg?token=8xk2OrrxWm)](https://codecov.io/gh/webpack/watchpack)
-[![Downloads](https://img.shields.io/npm/dm/watchpack.svg)](https://www.npmjs.com/package/watchpack)
-
-## 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
-```