/// <reference types="node" />
import { Connection, FieldInfo, Pool } from 'mysql';
import { Type } from "../Utils.js";
import Migration, { MigrationType } from "./Migration.js";
export interface QueryResult {
    readonly results: Record<string, unknown>[];
    readonly fields: FieldInfo[];
    readonly other?: Record<string, unknown>;
    foundRows?: number;
}
export declare function query(queryString: string, values?: QueryVariable[], connection?: Connection): Promise<QueryResult>;
export default class MysqlConnectionManager {
    private static currentPool?;
    private static databaseReady;
    private static migrationsRegistered;
    private static readonly migrations;
    static isReady(): boolean;
    static registerMigrations(migrations: MigrationType<Migration>[]): void;
    private static registerMigration;
    static hasMigration(migration: Type<Migration>): boolean;
    static prepare(runMigrations?: boolean): Promise<void>;
    static get pool(): Pool;
    private static createPool;
    static endPool(): Promise<void>;
    static query(queryString: string, values?: QueryVariable[], connection?: Connection): Promise<QueryResult>;
    static wrapTransaction<T>(transaction: (connection: Connection) => Promise<T>): Promise<T>;
    private static rejectAndRollback;
    static getCurrentMigrationVersion(): Promise<number>;
    private static handleMigrations;
    /**
     * @param migrationId what migration to rollback. Use with caution. default=0 is for last registered migration.
     */
    static rollbackMigration(migrationId?: number): Promise<void>;
    static migrationCommand(args: string[]): Promise<void>;
}
export declare type QueryVariable = boolean | string | number | Date | Buffer | null | undefined;
export declare function isQueryVariable(value: unknown): value is QueryVariable;