A tiny hybrid filesystem watcher for a single file.
This uses a combination of native filesystem watching and polling to be simultaneously reliable, responsive, and tiny.
For more complicated use cases than just watching a single file check out pollex and watcher.
npm install --save file-polleximport watchFile from 'file-pollex';
// Let's define some options
const watchOptions = {
ignoreInitial: true, // Ignore the initial "add" event that may be emitted while the file path is being polled for the first time
ignoreReady: true, // Ignore the "ready" event, useful in combination with "ignoreInitial: true" to only get notified about actual changes
pollingInterval: 1000 // Poll the file path on this interval, to more reliably detect "add" and "unlink" events
};
// Let's listen for events
watch ( 'foo.txt', event => {
if ( event === 'add' ) {
// The file got added
} else if ( event === 'change' ) {
// The file got changed
} else if ( event === 'ready' ) {
// The initial polling has been done and the eventual initial "add" event has been emitted
} else if ( event === 'unlink' ) {
// The file got deleted
}
}, watchOptions );MIT © Fabio Spampinato