如何在vanilla js，nest.js中使用typescript typeorm？

npm install typeorm reflect-metadata mysql
npm install --save-dev @types/node @types/express

import { createConnection, Connection } from "typeorm";

const connection: Promise<Connection> = createConnection({
  type: "mysql",
  host: "localhost",
  port: 3306,
  username: "your_username",
  password: "your_password",
  database: "your_database",
  entities: [__dirname + "/entities/*.js"],
  synchronize: true,
});

import { Entity, PrimaryGeneratedColumn, Column } from "typeorm";

@Entity()
export class User {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  name: string;

  @Column()
  age: number;
}

import { getRepository } from "typeorm";

const userRepository = getRepository(User);

const user: User = new User();
user.name = "John Doe";
user.age = 25;

userRepository.save(user).then((savedUser) => {
  console.log("User saved:", savedUser);
});