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