Angular RXJS Retry

Can someone help me with code written using Angular/RXJS to achieve below solution

I have to open a popup using window.open() to load one website, it will take around 15-20 seconds for the website to get rendered in the popup.

Once the site is fully loaded in the popup, I have access to libraries namespace in the popup.

const library: any = window.open(
'http://10.XX.XX.XXX/customLibrary/V1',
' customLibrary ',
'toolbar=yes,scrollbars=yes,menubar=yes,location=yes,resizable=yes,width=1200,height=800'
);


utilityLibrary = library.utilityLibrary;


utilityLibrary object will be available only when the page is fully rendered in the popup.

I want to wait till page is fully loaded and libraries are available or I want to retry for every 10 seconds till the libraries are fully loaded. After retying for 5 times, if libraries are not available then I want to exit out and alert with "libraries are not available".

I have to write the code in the parent window not in popup

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