import { Observable } from 'rxjs';
import { ConfigCatUser, NgConfigCatConfiguration } from '../models';
export declare class NgConfigCatService {
    private readonly configCatClient;
    constructor(ngConfigCatConfiguration: NgConfigCatConfiguration);
    getValue<T = boolean>(key: string, defaultValue?: T, user?: ConfigCatUser): Observable<T>;
    getAllKeys(): Promise<string[]>;
    forceRefresh(): Promise<void>;
}