/**
 * The refreshed GitHub token, in the shape GitHub's token endpoint returns it.
 */
export interface RefreshedGitHubToken {
    access_token: string;
    refresh_token?: string;
    expires_in?: number;
}
/**
 * Refresh the stored GitHub token using its saved refresh token, rewrite
 * `~/.hublaunch/github-token` (mode 0o600) with the new values, and
 * best-effort re-authenticate the `gh` CLI with the fresh token.
 *
 * This is the single implementation shared by `hula login` (token reuse) and
 * `checkGhAuth` (proactive/expired refresh) so both behave identically. The
 * caller supplies the loaded config (for the GitHub App client ID) to avoid a
 * redundant `loadConfig()` call.
 *
 * `../commands/login.js` is imported dynamically to avoid a static module cycle
 * (login.ts imports this util), matching the pattern in `github-cli.ts` and
 * `github-token.ts`.
 *
 * @returns the refreshed token object, or `null` when there is no refresh token
 *          or the refresh request failed. Never throws.
 */
export declare function refreshStoredGitHubToken(config: any): Promise<RefreshedGitHubToken | null>;
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