code: function isRedirectToValidForSsr( redirectToQueryValue ) {
  	if ( 'undefined' === typeof redirectToQueryValue ) {
  		return true;
  	}
  
  	const redirectToDecoded = decodeURIComponent( redirectToQueryValue );
  	return (
  		redirectToDecoded.startsWith( 'https://wordpress.com/theme' ) ||
  		redirectToDecoded.startsWith( 'https://wordpress.com/go' )
  	);
  }
docs: Verifies if the given redirect_to value enables SSR or not.
  
  @param {string}   redirectToQueryValue The URI-encoded value of the analyzed redirect_to
  @return {boolean} If the value of &redirect_to= on the log-in page is compatible with SSR