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A simple file watcher library for node.

## Why NSFW?
NSFW is a native abstraction for Linux, Windows, and OSX file watching services which tries to keep a consistent interface and feature set across operating systems. NSFW offers recursive file watching into deep file systems all at no additional cost to the Javascript layer. In Linux, NSFW recursively builds an inotify watch tree natively, which collects events concurrently to the javascript thread. In OSX, NSFW utilizes the FSEventsService, which recursively watches for file system changes in a specified directory. In Windows, NSFW implements a server around the ReadDirectoryChangesW method.
NSFW is a native abstraction for Linux, Windows, and macOS file watching services which tries to keep a consistent interface and feature set across operating systems. NSFW offers recursive file watching into deep file systems all at no additional cost to the Javascript layer. In Linux, NSFW recursively builds an inotify watch tree natively, which collects events concurrently to the javascript thread. On macOS, NSFW utilizes the FSEventsService, which recursively watches for file system changes in a specified directory. In Windows, NSFW implements a server around the ReadDirectoryChangesW method.

When NSFW has events and is not being throttled, it will group those events in the order that they occurred and report them to the Javascript layer in a single callback. This is an improvement over services that utilize Node FS.watch, which uses a callback for every file event that is triggered. Every callback FS.watch makes to the event queue is a big bonus to NSFW's performance when watching large file system operations, because NSFW will only make 1 callback with many events within a specified throttle period.

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