import type { GoogleDocsCredentials } from './types.js';
import { GoogleApiClient } from './api-client.js';
/**
 * Resolve Google API credentials from environment or explicit config.
 * Returns a GoogleApiClient backed by google-auth-library + native fetch.
 *
 * For domain-wide delegation (impersonateUser), we use JWT
 * with the `subject` parameter — GoogleAuth's clientOptions.subject does
 * not reliably pass through to the underlying JWT client.
 */
export declare function resolveCredentials(credentials?: GoogleDocsCredentials): Promise<GoogleApiClient>;
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