import type { GitHubOAuthConfig, User } from "./types.js";
/**
 * OAuth 2.0 client for GitHub authentication.
 * Uses native fetch() for HTTP calls with no external dependencies.
 */
export declare class GitHubOAuthClient {
    private readonly config;
    constructor(config: GitHubOAuthConfig);
    /**
     * Build the GitHub OAuth authorization URL.
     * Optionally supports PKCE via codeVerifier (S256 challenge).
     */
    getAuthorizationUrl(state: string, codeVerifier?: string): string;
    /**
     * Exchange an authorization code for an access token.
     */
    exchangeCode(code: string, codeVerifier?: string): Promise<{
        accessToken: string;
        tokenType: string;
        scope: string;
    }>;
    /**
     * Fetch the authenticated user's profile from GitHub.
     */
    getUserProfile(accessToken: string): Promise<User>;
}
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