import type { Configuration, Transaction, EntityName } from '@mikro-orm/core';
import type { MongoDriver } from '@mikro-orm/mongodb';
import type { Collection, ClientSession, Document, Db } from 'mongodb';
/** Base class for MongoDB migrations. Extend this class and implement `up()` (and optionally `down()`). */
export declare abstract class Migration {
  protected readonly driver: MongoDriver;
  protected readonly config: Configuration;
  protected ctx?: Transaction<ClientSession>;
  constructor(driver: MongoDriver, config: Configuration);
  abstract up(): Promise<void>;
  down(): Promise<void>;
  isTransactional(): boolean;
  reset(): void;
  setTransactionContext(ctx: Transaction): void;
  getCollection<T extends Document>(entityOrCollectionName: EntityName<T> | string): Collection<T>;
  getDb(): Db;
}