import { AxiosInstance } from 'axios';
import type { OAuthConfig, RestClientConfig } from './models/config';
interface OAuthInterceptorConfig extends OAuthConfig {
    debug?: boolean;
    restClientConfig?: RestClientConfig;
}
/**
 * OAuth 2.0 Password Grant Flow Interceptor.
 */
declare class OAuthInterceptor {
    private tokenEndpoint;
    private username;
    private password;
    private clientId;
    private clientSecret?;
    private scope?;
    private restClientConfig;
    private debug;
    private accessToken;
    private refreshToken;
    private tokenExpiresAt;
    private tokenRenewPromise;
    constructor(config: OAuthInterceptorConfig);
    logDebug(message: string, data?: unknown): void;
    /**
     * Obtains or refreshes the access token.
     */
    getAccessToken(): Promise<string>;
    /**
     * Refreshes the access token using password grant or refresh token grant.
     */
    renewToken(): Promise<string>;
    /**
     * Requests a token using the specified grant type.
     */
    private requestToken;
    /**
     * Attaches the interceptor to an axios instance.
     */
    attach(axiosInstance: AxiosInstance): void;
}
export = OAuthInterceptor;