import type { OAuth2Client, JWT } from 'google-auth-library';
/** BigQuery 호출에 쓰이는 인증 클라이언트 — 사용자 OAuth 또는 서비스 계정 JWT. */
export type BigQueryAuthClient = OAuth2Client | JWT;
export declare function runQuery(auth: BigQueryAuthClient, projectId: string, query: string, maxResults?: number): Promise<{
    jobComplete: boolean | null | undefined;
    totalRows: string | null | undefined;
    schema: {
        name: string | null | undefined;
        type: string | null | undefined;
    }[];
    rows: {
        [k: string]: any;
    }[];
}>;
export declare function listDatasets(auth: BigQueryAuthClient, projectId: string): Promise<{
    datasetId: string | null | undefined;
    location: string | undefined;
}[]>;
export declare function listTables(auth: BigQueryAuthClient, projectId: string, datasetId: string): Promise<{
    tableId: string | null | undefined;
    type: string | undefined;
}[]>;
export declare function getTableSchema(auth: BigQueryAuthClient, projectId: string, datasetId: string, tableId: string): Promise<{
    tableId: string;
    schema: {
        name: string | null | undefined;
        type: string | null | undefined;
        mode: string | null | undefined;
        description: string | null | undefined;
    }[] | undefined;
}>;