@remote.it/core/src/FileWatcher.ts

Core remote.it JavasScript/TypeScript library

import chokidar from 'chokidar'
import { EventEmitter } from 'events'
import { resolve } from 'path'

type FileWatcherMessage = 'ready' | 'created' | 'updated' | 'removed' | 'error'

export interface FileWatcher {
  // on(msg: FileWatcherMessage, cb: (...args: any[]) => void): this
  on(msg: 'ready', cb: (path: string) => void): this
  on(msg: 'created', cb: (path: string) => void): this
  on(msg: 'updated', cb: (path: string) => void): this
  on(msg: 'removed', cb: (path: string) => void): this
  on(msg: 'error', cb: (error: string) => void): this
  emit(msg: FileWatcherMessage, ...args: any[]): boolean
}

export class FileWatcher extends EventEmitter {
  private watcher: chokidar.FSWatcher

  constructor(public location: string) {
    super()
    this.watcher = chokidar
      .watch(resolve(location))
      .on('ready', () => this.emit('ready', location))
      .on('add', path => this.emit('created', path))
      .on('change', path => this.emit('updated', path))
      .on('unlink', path => this.emit('removed', path))
      .on('error', error => this.emit('error', error))
    // .on('raw', (event, path, details) => {});
  }

  stop() {
    this.watcher.close()
  }
}