/**
 * SheetsConnector — polls Google Sheets via the gws CLI tool.
 * Uses child_process.execSync to call gws CLI commands.
 * Emits spreadsheet_row NormalizedItems for changed/new rows.
 */
import type { AuthRequirement, ConnectorConfig, ConnectorHealth, IConnector, NormalizedItem } from '../framework/types.js';
export declare class SheetsConnector implements IConnector {
    readonly name = "sheets";
    readonly type: "api";
    private config;
    private lastPollTime;
    private lastPollCount;
    private lastError;
    /** Snapshot of previous rows per channel: channelName → rows (excluding header) */
    private lastSnapshot;
    constructor(config: ConnectorConfig);
    private get snapshotPath();
    init(): Promise<void>;
    dispose(): Promise<void>;
    private loadSnapshot;
    private saveSnapshot;
    healthCheck(): Promise<ConnectorHealth>;
    getAuthRequirements(): AuthRequirement[];
    authenticate(): Promise<boolean>;
    poll(_since: Date): Promise<NormalizedItem[]>;
}
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