Add a watcher that is called whenever the pasteboard contents change.
Multiple watchers may be registered; they are each called independently.
Because macOS provides no pasteboard change notification API, this is implemented
by polling changeCount at the interval specified by watcherInterval.
Parameters
listener: (changeCount:number)=>void
A function called with the new changeCount integer whenever the pasteboard changes
Add a watcher that is called whenever the pasteboard contents change. Multiple watchers may be registered; they are each called independently. Because macOS provides no pasteboard change notification API, this is implemented by polling
changeCountat the interval specified bywatcherInterval.