import { type BlockExecutor } from '../orchestration-schema.js';
export declare function normalizeSchemaNames(value: unknown): string[];
/**
 * @serverBlockDoc
 * {
 *   "version": 1,
 *   "functionName": "dropSchemas",
 *   "displayName": "删除 Postgres Schemas",
 *   "category": "database",
 *   "description": "在一个 Postgres 数据源事务中幂等删除多个安全 Schema；cascade 默认 false。",
 *   "inputs": [
 *     { "key": "datasource", "type": "string", "required": true, "description": "Schema 所在的 Postgres 数据源。" },
 *     { "key": "schemas", "type": "string[]", "required": true, "description": "待删除的安全 Schema 名称数组；允许空数组。" },
 *     { "key": "cascade", "type": "boolean", "required": false, "default": false, "description": "是否追加 CASCADE 删除 Schema 内对象。" }
 *   ],
 *   "outputs": [
 *     { "key": "schemas", "type": "string[]", "description": "已完成幂等删除处理的去重 Schema 名称。" },
 *     { "key": "dropped", "type": "number", "description": "已处理 Schema 数量；原本不存在的 Schema 也计入。" }
 *   ],
 *   "errors": [
 *     { "code": "BLOCK_INVALID_SCHEMA", "description": "schemas 或 cascade 无效，或包含非法、危险及保留 Schema 名称。" },
 *     { "code": "BLOCK_DATASOURCE_UNSUPPORTED_DATABASE", "description": "datasource 不是 Postgres。" },
 *     { "code": "BLOCK_SQL_UNSUPPORTED", "description": "执行器未提供事务运行器。" }
 *   ],
 *   "config": [],
 *   "runtime": [
 *     { "key": "requiresDatasource", "type": "boolean", "value": true, "description": "需要 Postgres datasource，并在同一个连接事务中执行全部 DROP SCHEMA。" }
 *   ],
 *   "examples": [
 *     { "title": "删除业务 Schemas", "block": { "uuid": "drop_schemas", "functionName": "dropSchemas", "inputs": { "datasource": "MokelayFree", "schemas": ["e_abc123"], "cascade": true }, "outputs": ["schemas", "dropped"], "nextBlock": null } }
 *   ]
 * }
 */
export declare const executeDropSchemasBlock: BlockExecutor;