/**
 * @license
 * Copyright 2025 Vybestack LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { type DeviceCodeResponse, type OAuthToken } from './types.js';
/**
 * Configuration for Qwen device flow authentication
 */
export interface DeviceFlowConfig {
    clientId: string;
    authorizationEndpoint: string;
    tokenEndpoint: string;
    scopes: string[];
}
/**
 * Qwen OAuth device flow implementation
 */
export declare class QwenDeviceFlow {
    private config;
    private pkceVerifier;
    constructor(config: DeviceFlowConfig);
    /**
     * Initiates the device authorization flow
     * @returns Promise resolving to device code response
     */
    initiateDeviceFlow(): Promise<DeviceCodeResponse>;
    /**
     * Polls the authorization server for an access token
     * @param deviceCode Device code from initiation response
     * @returns Promise resolving to OAuth token
     */
    pollForToken(deviceCode: string): Promise<OAuthToken>;
    /**
     * Refreshes an expired access token
     * @param refreshToken Valid refresh token
     * @returns Promise resolving to new OAuth token
     */
    refreshToken(refreshToken: string): Promise<OAuthToken>;
    /**
     * Generates PKCE code verifier and challenge
     * @returns Object containing verifier and challenge strings
     */
    private generatePKCE;
}