import { IExternalRequester, SendRequestParametersType, RequestType, KameleoonResponseType, IUrlProvider, IEventManager } from '@kameleoon/javascript-sdk-core';
import { CredentialsType } from './types';
export declare class RequesterMiddleware implements IExternalRequester {
    private readonly requester;
    private readonly urlProvider;
    private readonly accessTokenSource;
    private readonly _isKameleoonRequester;
    private eventManager?;
    /**
     * @param requestTimeout - timeout of an access token request, in milliseconds
     */
    constructor(requester: IExternalRequester, credentials: CredentialsType, urlProvider: IUrlProvider, requestTimeout?: number);
    get isKameleoonRequester(): boolean;
    /**
     * Sets the SDK event manager used to fire `EventType.HttpRequest` SDK events
     * for access token requests
     */
    setEventManager(eventManager: IEventManager): void;
    sendRequest<T extends RequestType>({ url, parameters, retryCount, requestType, }: SendRequestParametersType<T>): Promise<KameleoonResponseType>;
    private fetchAccessToken;
    private getAuthHeader;
}