import { sheets_v4 } from 'googleapis';
/** Initialize the Google Sheets API client from base64-encoded service account credentials in `GOOGLE_SERVICE_ACCOUNT`. */
export declare function initializeSheetsApi(): Promise<sheets_v4.Sheets>;
/** Test connection to a spreadsheet by fetching its title. */
export declare function testConnection(sheetsApi: sheets_v4.Sheets, spreadsheetId: string): Promise<boolean>;
