创建并连接数据库，并修改登录和注册接口

node_modules/mysql2/typings/mysql/lib/Server.d.ts

@@ -0,0 +1,11 @@
+import { EventEmitter } from 'events';
+import { Connection } from './Connection.js';
+
+declare class Server extends EventEmitter {
+  connections: Array<Connection>;
+
+  listen(port: number): Server;
+  close(callback: (error: Error, count: number) => any): void;
+}
+
+export { Server };