import { type AnyEntity, type Configuration, type EntityData, type RawQueryFragment, type Transaction } from '@mikro-orm/core';
import type { AbstractSqlDriver, EntityManager, NativeQueryBuilder } from '@mikro-orm/sql';
/** A migration query: raw SQL string, a native query builder instance, or a `raw()` SQL fragment. */
export type Query = string | NativeQueryBuilder | RawQueryFragment;
/** Base class for SQL database migrations. Extend this class and implement `up()` (and optionally `down()`). */
export declare abstract class Migration {
    #private;
    protected readonly driver: AbstractSqlDriver;
    protected readonly config: Configuration;
    protected ctx?: Transaction;
    constructor(driver: AbstractSqlDriver, config: Configuration);
    abstract up(): Promise<void> | void;
    down(): Promise<void> | void;
    isTransactional(): boolean;
    addSql(sql: Query): void;
    reset(): void;
    setTransactionContext(ctx: Transaction): void;
    /**
     * Executes a raw SQL query. Accepts a string SQL, `raw()` SQL fragment, or a native query builder instance.
     * The `params` parameter is respected only if you use string SQL in the first parameter.
     */
    execute(sql: Query, params?: unknown[]): Promise<EntityData<AnyEntity>[]>;
    /**
     * Creates a cached `EntityManager` instance for this migration, which will respect
     * the current transaction context.
     */
    getEntityManager(): EntityManager;
    getQueries(): Query[];
}