API Reference > frontend-Authorization-client > Authorization > isFrontendAuthorizationClient isFrontendAuthorizationClient Function Beta FrontendAuthorization type guard. isFrontendAuthorizationClient(client: undefined | AuthorizationClient): client is FrontendAuthorizationClient Parameter Type Description client undefined | AuthorizationClient Returns - client is FrontendAuthorizationClient Defined in frontend-authorization/src/FrontendAuthorizationClient.ts Line 31 Last Updated: 29 November, 2022