import * as chokidar from 'chokidar'

type Handler = (filePath: string) => void

export class FileWatcher {
  private watcher: chokidar.FSWatcher
  constructor(targetPat: string) {
    this.watcher = chokidar.watch(targetPat, {
      ignored: /(^|[\/\\])\../, // ignore dotfiles
      persistent: true,
    })
  }
  public onFileAdd(handler: Handler) {
    this.watcher.on('add', handler)
  }
  public onFileDlete(handler: Handler) {
    this.watcher.on('unlink', handler)
  }
  public onFileChange(handler: Handler) {
    // this.watcher.on('change', handler)
    this.watcher.on('all', handler)
  }
}