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# fb-watchman `fb-watchman` is a filesystem watcher that uses the [Watchman](https://facebook.github.io/watchman/) file watching service from Facebook. Watchman provides file change notification services using very efficient recursive watches and also allows more advanced change matching and filesystem tree querying operations using [a powerful expression syntax](https://facebook.github.io/watchman/docs/file-query.html#expressions). ## Install You should [install Watchman]( https://facebook.github.io/watchman/docs/install.html) to make the most of this module. Then simply: ``` $ npm install fb-watchman ``` ## Key Concepts - Watchman recursively watches directories. - Each watched directory is called a `root`. - You must initiate a `watch` on a `root` using the `watch-project` command prior to subscribing to changes - Rather than separately watching many sibling directories, `watch-project` consolidates and re-uses existing watches relative to a project root (the location of your `.watchmanconfig` or source control repository root) - change notifications are relative to the project root ## How do I use it? [Read the NodeJS watchman documentation](https://facebook.github.io/watchman/docs/nodejs.html)