/**
 * GitHub OAuth helpers for upstream authentication delegation.
 * The MCP server uses GitHub as the identity provider -- users authenticate
 * with GitHub, and we map their GitHub user ID to a Rewind user_id.
 */
export interface GitHubUser {
    id: number;
    login: string;
    name: string | null;
    avatar_url: string;
}
/**
 * Build the GitHub OAuth authorization URL.
 * Redirects the user to GitHub to authenticate.
 */
export declare function getGitHubAuthorizeUrl(clientId: string, redirectUri: string, state: string): string;
/**
 * Exchange a GitHub authorization code for an access token,
 * then fetch the authenticated user's profile.
 */
export declare function exchangeGitHubCode(code: string, clientId: string, clientSecret: string): Promise<GitHubUser>;