export declare const streamConfig: () => void;
export declare const streamSend: (mailOptions: {
    from?: string;
    to?: string;
    cc?: string;
    bcc?: string;
    subject?: string;
    text?: string;
    html?: string;
    attachments?: [];
}, callback: {
    (res: any, err: any): void;
    (arg0: {} | null, arg1: Error | null): void;
}) => void;