/**
 * Simple, secure token storage without native dependencies
 * Stores encrypted tokens in user's home directory
 */
export interface StoredTokens {
    accessToken: string;
    refreshToken: string;
    expiresAt: string;
}
export declare class TokenStorage {
    private configDir;
    private tokenFile;
    private keyFile;
    constructor(serviceName?: string);
    /**
     * Store tokens securely
     */
    storeTokens(tokens: StoredTokens): Promise<void>;
    /**
     * Retrieve stored tokens
     */
    getStoredTokens(): Promise<StoredTokens | null>;
    /**
     * Clear stored tokens
     */
    clearTokens(): Promise<void>;
    /**
     * Get or create encryption key
     */
    private getOrCreateKey;
}