/**
 * MCP-Based Token Manager for HubSpot OAuth
 * Handles token refresh through MCP protocol to avoid direct API issues
 */
export interface TokenData {
    portalId: string;
    accessToken: string;
    refreshToken: string;
    expiresAt: number;
    scope?: string;
}
export interface TokenRefreshResult {
    success: boolean;
    accessToken?: string;
    refreshToken?: string;
    expiresAt?: number;
    error?: string;
}
export declare class MCPTokenManager {
    private hubspotClient;
    private refreshLocks;
    private readonly TOKEN_LIFETIME_MS;
    private readonly EARLY_REFRESH_BUFFER_MS;
    private readonly REFRESH_JITTER_MS;
    constructor(accessToken: string);
    /**
     * Check if token needs refresh based on HubSpot's 30-minute expiry
     */
    needsRefresh(tokenData: TokenData): boolean;
    /**
     * Refresh token using MCP protocol with singleflight locking
     */
    refreshToken(tokenData: TokenData): Promise<TokenRefreshResult>;
    /**
     * Perform the actual token refresh
     */
    private performRefresh;
    /**
     * Validate current token by checking with HubSpot
     */
    validateToken(accessToken: string): Promise<{
        valid: boolean;
        expiresIn?: number;
        hubId?: string;
    }>;
    /**
     * Get token status and health information
     */
    getTokenHealth(tokenData: TokenData): {
        status: 'healthy' | 'expiring_soon' | 'expired';
        minutesToExpiry: number;
        needsRefresh: boolean;
    };
}