diff --git a/src/MigrateDB/Builder.php b/src/MigrateDB/Builder.php
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+++ b/src/MigrateDB/Builder.php
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+<?php
+
+/*
+ * This file is part of the "dragon-code/contracts" project.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @author Andrey Helldar <helldar@ai-rus.com>
+ *
+ * @copyright 2021 Andrey Helldar
+ *
+ * @license MIT
+ *
+ * @see https://github.com/TheDragonCode/contracts
+ */
+
+declare(strict_types=1);
+
+namespace DragonCode\Contracts\MigrateDB;
+
+use Illuminate\Database\Connection;
+use Illuminate\Database\Schema\Builder as SchemaBuilder;
+
+interface Builder
+{
+    public function __construct(Connection $connection);
+
+    /**
+     * @return \Illuminate\Database\Schema\Builder|\Illuminate\Database\Schema\MySqlBuilder|\Illuminate\Database\Schema\PostgresBuilder
+     */
+    public function schema(): SchemaBuilder;
+
+    public function getPrimaryKey(string $table): string;
+
+    public function getAllTables(): array;
+
+    public function dropAllTables(): void;
+
+    public function disableForeign(): void;
+
+    public function enableForeign(): void;
+}