Package Exports

fsevents

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (fsevents) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

fsevents

Native access to MacOS FSEvents in Node.js

The FSEvents API in MacOS allows applications to register for notifications of changes to a given directory tree. It is a very fast and lightweight alternative to kqueue.

This is a low-level library. For a cross-platform file watching module that uses fsevents, check out Chokidar.

Installation

Supports only Node.js v8.16 and higher.

npm install fsevents

Usage

const fsevents = require('fsevents');
const stop = fsevents.watch(__dirname, (path, flags, id) => {
  const info = fsevents.getInfo(path, flags, id);
}); // To start observation
stop(); // To end observation

The callback passed as the second parameter to .watch get's called whenever the operating system detects a a change in the file system. It takes three arguments:

`fsevents.watch(dirname: string, (path: string, flags: number, id: string) => void): () => Promise<undefined>`

path: string - the item in the filesystem that have been changed
flags: number - a numeric value describing what the change was
id: string - an unique-id identifying this specific event

Returns closer callback which when called returns a Promise resolving when the watcher process has been shut down.

`fsevents.getInfo(path: string, flags: number, id: string): FsEventInfo`

The getInfo function takes the path, flags and id arguments and converts those parameters into a structure that is easier to digest to determine what the change was.

The FsEventsInfo has the following shape:

/**
 * @typedef {'created'|'modified'|'deleted'|'moved'|'root-changed'|'cloned'|'unknown'} FsEventsEvent
 * @typedef {'file'|'directory'|'symlink'} FsEventsType
 */
{
  "event": "created", // {FsEventsEvent}
  "path": "file.txt", 
  "type": "file",    // {FsEventsType}
  "changes": {
    "inode": true,   // Had iNode Meta-Information changed
    "finder": false, // Had Finder Meta-Data changed
    "access": false, // Had access permissions changed
    "xattrs": false  // Had xAttributes changed
  },
  "flags": 0x100000000
}

Engine compatibility

v2 supports node 8.16+
v1.2.8 supports node 6+
v1.2.7 supports node 4+

Troubleshooting

I'm getting EBADPLATFORM Unsupported platform for fsevents error.
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.

License

Visit our GitHub page and NPM Page