import { CognifitSdkError } from './lib/cognifit.sdk.error';
import { CognifitSdkValidator } from './lib/cognifit.sdk.validator';
import { CognifitSdkConfig } from './lib/cognifit.sdk.config';
import { Observable } from 'rxjs';
export declare class CognifitSdk {
    cognifitSdkConfig: CognifitSdkConfig;
    cognifitSdkError: CognifitSdkError;
    cognifitSdkValidator: CognifitSdkValidator;
    initialized: boolean;
    init(config: CognifitSdkConfig): Promise<string>;
    start(type: string, key: string): Observable<any>;
}