Variable mailtoCallback

mailtoCallback:
    | (
        (
            scheme: string,
            host: string,
            params: Record<string, string>,
            fullURL: string,
            senderPID: number,
        ) => void
    )
    | null

Callback invoked when Hammerspoon 2 receives a mailto: URL. Fires only when Hammerspoon 2 is the system default handler for mailto. Assign null to remove the callback.