import type { InteropObservable, Observable, Unsubscribable } from 'rxjs';
import type { ExternalData } from './types';
import { ExternalDataCache } from './types';
export type { InteropObservable, Unsubscribable } from 'rxjs';
export declare class ExternalDataService {
    private readonly cache;
    constructor(cache: ExternalDataCache);
    registerExternalData(key: string, observable: InteropObservable<unknown>): Unsubscribable;
    getExternalData(): Observable<ExternalData>;
}