export declare const COPILOT_HEADERS: Record<string, string>;
/** Derive the Copilot API base URL from a Copilot token's `proxy-ep` field.
 *  Rejects hostnames that are not public Copilot endpoints (SSRF guard). */
export declare function copilotBaseUrlFromToken(token: string | undefined): string;
export interface CopilotTokenResult {
    /** The short-lived Copilot token (the access token used for chat). */
    token: string;
    /** Absolute expiry in epoch milliseconds. */
    expires: number;
}
/** Mint a fresh Copilot token from the long-lived GitHub OAuth token. */
export declare function refreshCopilotToken(githubToken: string, signal?: AbortSignal): Promise<CopilotTokenResult>;
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