RouterOptions 
ts
type RouterOptions: object & RouterRejectionComponents;Options to initialize a Router instance.
Type declaration 
historyMode? 
ts
optional historyMode: RouterHistoryMode;Specifies the history mode for the router, such as 'hash', 'history', or 'abstract'.
initialUrl? 
ts
optional initialUrl: string;Initial URL for the router to use. Required if using Node environment.
Default 
ts
window.location.toString()