/**
 * TelegramConnector — polls Telegram channels via native fetch using Bot API getUpdates.
 * Tracks offset state for sequential polling.
 */
import type { AuthRequirement, ConnectorConfig, ConnectorHealth, IConnector, NormalizedItem } from '../framework/types.js';
export declare class TelegramConnector implements IConnector {
    readonly name = "telegram";
    readonly type: "api";
    private config;
    private token;
    private readonly baseUrl;
    private offset;
    private lastPollTime;
    private lastPollCount;
    private lastError;
    constructor(config: ConnectorConfig);
    init(): Promise<void>;
    dispose(): Promise<void>;
    healthCheck(): Promise<ConnectorHealth>;
    getAuthRequirements(): AuthRequirement[];
    authenticate(): Promise<boolean>;
    poll(since: Date): Promise<NormalizedItem[]>;
}
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