import type { KsefAdapter, FetchInvoicesOpts, SendInvoiceInput, SendInvoiceResult, UpoResult, Invoice } from '@ksefnik/shared';
import type { KsefClient, KsefClientConfig, KsefSessionState } from './types.js';
export declare class KsefAdapterImpl implements KsefAdapter {
    private readonly client;
    private readonly config;
    private session;
    constructor(client: KsefClient, config: KsefClientConfig);
    initSession(): Promise<void>;
    closeSession(): Promise<void>;
    getSession(): KsefSessionState | null;
    private ensureSession;
    fetchInvoices(opts: FetchInvoicesOpts): Promise<Invoice[]>;
    sendInvoice(input: SendInvoiceInput): Promise<SendInvoiceResult>;
    getUpo(ksefReference: string): Promise<UpoResult>;
}
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