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90 lines
3.1 KiB
Markdown
90 lines
3.1 KiB
Markdown
12 months ago
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# fsevents
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Native access to MacOS FSEvents in [Node.js](https://nodejs.org/)
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The FSEvents API in MacOS allows applications to register for notifications of
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changes to a given directory tree. It is a very fast and lightweight alternative
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to kqueue.
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This is a low-level library. For a cross-platform file watching module that
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uses fsevents, check out [Chokidar](https://github.com/paulmillr/chokidar).
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## Usage
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```sh
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npm install fsevents
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```
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Supports only **Node.js v8.16 and higher**.
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```js
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const fsevents = require('fsevents');
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// To start observation
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const stop = fsevents.watch(__dirname, (path, flags, id) => {
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const info = fsevents.getInfo(path, flags);
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});
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// To end observation
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stop();
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```
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> **Important note:** The API behaviour is slightly different from typical JS APIs. The `stop` function **must** be
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> retrieved and stored somewhere, even if you don't plan to stop the watcher. If you forget it, the garbage collector
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> will eventually kick in, the watcher will be unregistered, and your callbacks won't be called anymore.
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The callback passed as the second parameter to `.watch` get's called whenever the operating system detects a
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a change in the file system. It takes three arguments:
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###### `fsevents.watch(dirname: string, (path: string, flags: number, id: string) => void): () => Promise<undefined>`
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* `path: string` - the item in the filesystem that have been changed
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* `flags: number` - a numeric value describing what the change was
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* `id: string` - an unique-id identifying this specific event
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Returns closer callback which when called returns a Promise resolving when the watcher process has been shut down.
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###### `fsevents.getInfo(path: string, flags: number, id: string): FsEventInfo`
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The `getInfo` function takes the `path`, `flags` and `id` arguments and converts those parameters into a structure
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that is easier to digest to determine what the change was.
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The `FsEventsInfo` has the following shape:
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```js
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/**
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* @typedef {'created'|'modified'|'deleted'|'moved'|'root-changed'|'cloned'|'unknown'} FsEventsEvent
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* @typedef {'file'|'directory'|'symlink'} FsEventsType
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*/
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{
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"event": "created", // {FsEventsEvent}
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"path": "file.txt",
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"type": "file", // {FsEventsType}
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"changes": {
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"inode": true, // Had iNode Meta-Information changed
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"finder": false, // Had Finder Meta-Data changed
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"access": false, // Had access permissions changed
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"xattrs": false // Had xAttributes changed
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},
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"flags": 0x100000000
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}
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```
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## Changelog
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- v2.3 supports Apple Silicon ARM CPUs
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- v2 supports node 8.16+ and reduces package size massively
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- v1.2.8 supports node 6+
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- v1.2.7 supports node 4+
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## Troubleshooting
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- I'm getting `EBADPLATFORM` `Unsupported platform for fsevents` error.
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- It's fine, nothing is broken. fsevents is macos-only. Other platforms are skipped. If you want to hide this warning, report a bug to NPM bugtracker asking them to hide ebadplatform warnings by default.
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## License
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The MIT License Copyright (C) 2010-2020 by Philipp Dunkel, Ben Noordhuis, Elan Shankar, Paul Miller — see LICENSE file.
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Visit our [GitHub page](https://github.com/fsevents/fsevents) and [NPM Page](https://npmjs.org/package/fsevents)
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