export declare const getNS: <NS>(_: string) => NS | undefined;
export declare const initializeExternalNS: <NS>(namespaceName: string, url: string, isModule?: boolean) => Promise<NS | undefined>;
export declare const initializeExternalStylesheet: (url?: string) => void;
export declare function useExternalNS<NS>(namespaceName: string, url: string, unmountNS?: boolean): NS | undefined;