// if the given file does not exist or failed during parsing.
func NewFileWatcher(fileWatcher filewatcher.FileWatcher, filename string, multiWatch bool) (Watcher, error) {
	meshConfigYaml, err := ReadMeshConfigData(filename)
	if err != nil {
		return nil, err
	}

	meshConfig, err := ApplyMeshConfigDefaults(meshConfigYaml)
	if err != nil {
		return nil, err
	}

	w := &internalWatcher{