directoryURLs
The directories managed by this extension.
Declaration
var directoryURLs: Set<URL>! { get set }Discussion
The extension receives beginObservingDirectory(at:) and endObservingDirectory(at:) messages for every directory in this set and for all of their subdirectories.
Always set directoryURLs when the extension starts. If there are no directories to watch, set directoryURLs to an empty set.