import { Connection } from "../connection/Connection";
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import { Migration } from "./Migration";
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import { QueryRunner } from "../query-runner/QueryRunner";
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/**
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* Executes migrations: runs pending and reverts previously executed migrations.
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*/
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export declare class MigrationExecutor {
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protected connection: Connection;
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protected queryRunner?: QueryRunner | undefined;
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/**
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* Indicates if migrations must be executed in a transaction.
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*/
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transaction: boolean;
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private readonly migrationsTable;
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private readonly migrationsTableName;
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constructor(connection: Connection, queryRunner?: QueryRunner | undefined);
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/**
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* Executes all pending migrations. Pending migrations are migrations that are not yet executed,
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* thus not saved in the database.
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*/
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executePendingMigrations(): Promise<Migration[]>;
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/**
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* Reverts last migration that were run.
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*/
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undoLastMigration(): Promise<void>;
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/**
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* Creates table "migrations" that will store information about executed migrations.
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*/
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protected createMigrationsTableIfNotExist(queryRunner: QueryRunner): Promise<void>;
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/**
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* Loads all migrations that were executed and saved into the database.
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*/
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protected loadExecutedMigrations(queryRunner: QueryRunner): Promise<Migration[]>;
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/**
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* Gets all migrations that setup for this connection.
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*/
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protected getMigrations(): Migration[];
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/**
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* Finds the latest migration (sorts by timestamp) in the given array of migrations.
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*/
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protected getLatestTimestampMigration(migrations: Migration[]): Migration | undefined;
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/**
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* Finds the latest migration (sorts by id) in the given array of migrations.
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*/
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protected getLatestExecutedMigration(migrations: Migration[]): Migration | undefined;
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/**
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* Inserts new executed migration's data into migrations table.
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*/
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protected insertExecutedMigration(queryRunner: QueryRunner, migration: Migration): Promise<void>;
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/**
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* Delete previously executed migration's data from the migrations table.
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*/
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protected deleteExecutedMigration(queryRunner: QueryRunner, migration: Migration): Promise<void>;
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}
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