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# cheap-watch |
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If it works, why use something else? |
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# Cheap Watch: If it works, why use something else? |
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[](https://www.npmjs.com/package/cheap-watch) |
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**Cheap Watch** is a small, simple, dependency-free, cross-platform file system watcher for Node.js 8+. |
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It began life as part of [Defiler](https://github.com/Conduitry/defiler) and was then prettied up and extracted into its own library. |
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## Constructor |
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### `new CheapWatch({ dir, filter, watch = true, debounce = 10 })`` |
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- `dir` - The directory whose contents to watch. It's recommended, though not required, for this to be an absolute path, say one returned by `path.resolve`. |
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- `filter({ path, stats })` - _(optional)_ A function to decide whether a given file or directory should be watched. It's passed an object containing the file or directory's relative `path` and its `stats`. It should return `true` or `false` (or a `Promise` resolving to one of those). Returning `false` for a directory means that none of its contents will be watched. You can use `stats.isFile()` and `stats.isDirectory()` to determine whether this is a file or a directory. |
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- `watch` - _(optional)_ Whether to actually watch the directory for changes. Defaults to `true`. If `false`, you can retrieve all of the files within a given directory along with their `Stats` but changes will not actually be watched. |
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- `debounce` - _(optional)_ Length of timeout in milliseconds to use to debounce incoming events from `fs.watch`. Defaults to 10. Multiple events are often emitted for a single change, and events can also be emitted before `fs.stat` reports the changes. Cheap Watch will wait until `debounce` milliseconds have passed since the last `fs.watch` event for a file before reporting it. The default of 10ms Works On My Machine. |
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## Methods |
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### `cheapWatch.init()` |
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Initialize the watcher, traverse the directory to find the initial files, and set up watchers to look for changes. |
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This returns a `Promise` that resolves to an array of `{ path, stats }` object, one per file. `path` is a relative path from the `CheapWatch`'s `dir`, and `stats` is the `Stats` object for the file. |
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### `cheapWatch.close()` |
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Close all `FSWatcher` instances, and stop watching for file changes. |
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## Events |
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`CheapWatch` is a subclass of `EventEmitter`, and emits two events to report a new or update file or to report a deleted file. |
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### `+` `{ path, stats }` |
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A `+` event is emitted with an object containing a `path` string and a `stats` object whenever a watched file is created or updated. |
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### `-` `{ path }` |
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A `-` event is emitted with an object containing a `path` string whenever a watched file is deleted. |
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## Usage |
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```javascript |
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import CheapWatch from 'cheap-watch'; |
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const watch = new CheapWatch({ dir, /* ... */ }); |
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const initialFiles = await watch.init(); |
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watch.on('+', ({ path, stats }) => /* ... */ ); |
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watch.on('-', ({ path }) => /* ... */); |
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``` |
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## License |
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Copyright (c) 2018 Conduitry |
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- [MIT](LICENSE) |
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