import type { Key, Transaction } from '@google-cloud/datastore';
import { Datastore } from '@google-cloud/datastore';
import type { CommonDB, CommonDBOptions, CommonDBReadOptions, CommonDBSaveOptions, CommonDBSupport, CommonDBTransactionOptions, DBQuery, DBTransaction, DBTransactionFn, RunQueryResult } from '@naturalcycles/db-lib';
import { BaseCommonDB } from '@naturalcycles/db-lib';
import type { CommonLogger } from '@naturalcycles/js-lib/log';
import type { ObjectWithId, StringMap } from '@naturalcycles/js-lib/types';
import type { JsonSchema } from '@naturalcycles/nodejs-lib/ajv';
import { Pipeline } from '@naturalcycles/nodejs-lib/stream';
import type { DatastoreDBCfg, DatastoreDBOptions, DatastoreDBReadOptions, DatastoreDBSaveOptions, DatastoreDBStreamOptions, DatastorePropertyStats, DatastoreStats } from './datastore.model.js';
/**
 * Datastore API:
 * https://googlecloudplatform.github.io/google-cloud-node/#/docs/datastore/1.0.3/datastore
 * https://cloud.google.com/datastore/docs/datastore-api-tutorial
 */
export declare class DatastoreDB extends BaseCommonDB implements CommonDB {
    support: CommonDBSupport;
    constructor(cfg?: DatastoreDBCfg);
    cfg: DatastoreDBCfg & {
        logger: CommonLogger;
    };
    private cachedDatastore?;
    /**
     * Datastore.KEY
     */
    protected KEY: symbol;
    ds(): Datastore;
    ping(): Promise<void>;
    getByIds<ROW extends ObjectWithId>(table: string, ids: string[], opt?: DatastoreDBReadOptions): Promise<ROW[]>;
    multiGet<ROW extends ObjectWithId>(map: StringMap<string[]>, opt?: DatastoreDBReadOptions): Promise<StringMap<ROW[]>>;
    runQuery<ROW extends ObjectWithId>(dbQuery: DBQuery<ROW>, opt?: DatastoreDBReadOptions): Promise<RunQueryResult<ROW>>;
    runQueryCount<ROW extends ObjectWithId>(dbQuery: DBQuery<ROW>, opt?: DatastoreDBReadOptions): Promise<number>;
    private runDatastoreQuery;
    streamQuery<ROW extends ObjectWithId>(dbQuery: DBQuery<ROW>, _opt?: DatastoreDBStreamOptions): Pipeline<ROW>;
    /**
     * Returns saved entities with generated id/updated/created (non-mutating!)
     */
    saveBatch<ROW extends ObjectWithId>(table: string, rows: ROW[], opt?: DatastoreDBSaveOptions<ROW>): Promise<void>;
    deleteByQuery<ROW extends ObjectWithId>(q: DBQuery<ROW>, opt?: DatastoreDBReadOptions): Promise<number>;
    /**
     * Limitation: Datastore's delete returns void, so we always return all ids here as "deleted"
     * regardless if they were actually deleted or not.
     */
    deleteByIds(table: string, ids: string[], opt?: DatastoreDBOptions): Promise<number>;
    multiDelete(map: StringMap<string[]>, opt?: DatastoreDBOptions): Promise<number>;
    createTransaction(opt?: CommonDBTransactionOptions): Promise<DatastoreDBTransaction>;
    runInTransaction(fn: DBTransactionFn, opt?: CommonDBTransactionOptions): Promise<void>;
    getAllStats(): Promise<DatastoreStats[]>;
    /**
     * Returns undefined e.g when Table is non-existing
     */
    getStats(table: string): Promise<DatastoreStats | undefined>;
    getStatsCount(table: string): Promise<number | undefined>;
    getTableProperties(table: string): Promise<DatastorePropertyStats[]>;
    private mapId;
    private parseDatastoreEntity;
    private toDatastoreEntity;
    key(ds: Datastore, kind: string, id: string): Key;
    private getDsKey;
    private getIdFromKey;
    createTable<ROW extends ObjectWithId>(_table: string, _schema: JsonSchema<ROW>): Promise<void>;
    getTables(): Promise<string[]>;
    getTableSchema<ROW extends ObjectWithId>(table: string): Promise<JsonSchema<ROW>>;
    private getPRetryOptions;
    private rollback;
}
/**
 * https://cloud.google.com/datastore/docs/concepts/transactions#datastore-datastore-transactional-update-nodejs
 */
export declare class DatastoreDBTransaction implements DBTransaction {
    db: DatastoreDB;
    tx: Transaction;
    constructor(db: DatastoreDB, tx: Transaction);
    commit(): Promise<void>;
    rollback(): Promise<void>;
    getByIds<ROW extends ObjectWithId>(table: string, ids: string[], opt?: CommonDBReadOptions): Promise<ROW[]>;
    saveBatch<ROW extends ObjectWithId>(table: string, rows: ROW[], opt?: CommonDBSaveOptions<ROW>): Promise<void>;
    deleteByIds(table: string, ids: string[], opt?: CommonDBOptions): Promise<number>;
}