/**
 * Secure token persistence using the platform credential store.
 *
 * Stores Teams tokens via the cross-platform credential store:
 * macOS Keychain, Windows DPAPI, or Linux secret-tool/file.
 * Tokens are base64-encoded JSON with an acquisition timestamp.
 * Expired tokens (older than TOKEN_LIFETIME) are automatically cleared.
 */
import type { TeamsToken } from "./types.js";
export declare function saveToken(email: string, token: TeamsToken): Promise<void>;
export declare function loadToken(email: string): Promise<TeamsToken | null>;
export declare function clearToken(email: string): Promise<void>;
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