/**
 * GitHub Copilot login — GitHub OAuth **device flow** (no loopback server).
 * Headless port of the CLI's `github-copilot-oauth.ts`.
 *
 *   1. POST github.com/login/device/code → user_code + verification_uri.
 *   2. Poll login/oauth/access_token until GitHub returns an OAuth token.
 *   3. Exchange it at api.github.com/copilot_internal/v2/token for a
 *      short-lived Copilot token. The GitHub OAuth token is the refresh token.
 */
import type { BeginOAuthDeps, OAuthSession } from './types.js';
export declare const COPILOT_PROVIDER_ID = "github-copilot";
interface CopilotModelEntry {
    id?: unknown;
    is_chat_default?: unknown;
    is_chat_fallback?: unknown;
    vendor?: unknown;
    supported_endpoints?: unknown;
    policy?: {
        state?: unknown;
    } | undefined;
    capabilities?: {
        type?: unknown;
        supports?: {
            tool_calls?: unknown;
        } | undefined;
    } | undefined;
}
/** Whether a Copilot `/models` entry is a chat model drivable over this wire. */
export declare function isUsableCopilotChatModel(item: CopilotModelEntry): boolean;
export declare function beginCopilotLogin(_deps: BeginOAuthDeps | undefined, signal?: AbortSignal): Promise<OAuthSession>;
export {};
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