Angular集成TypeORM配置DataSource触发即时运行时错误求助

无法让Angular与TypeORM协同工作，已提供最小复现环境。

复现步骤 #

1. 创建全新Angular项目：

"C:\Program Files\nodejs\npx.cmd" --yes --package @angular/cli@latest ng new typeorm-problem --defaults --standalone=true

项目可通过ng serve在http://localhost:4200正常运行。

2. 安装TypeORM：

npm install typeorm

安装过程无漏洞。

3. 创建src/app/control目录并生成数据源服务：

ng generate service control/app.datasource

服务代码如下：

import { Injectable } from '@angular/core';
import {DataSource} from "typeorm";

@Injectable({
  providedIn: 'root'
})
export class AppDatasourceService {

  constructor() { }
}
export const AppDataSource = new DataSource({
  type: "mariadb",
  port: 3306,
  database: "test-db",
  host: "test-host",
  username: "test-user",
  password: "test-password",
  entities: ["../model/entities/*.{ts,js}",],
  synchronize: true,
  logging: true,  // set to false on production
});

4. 运行ng test时，即使未在任何组件中引用该服务，仍触发即时运行时错误。

运行时错误 #

Uncaught TypeError: Cannot read properties of undefined (reading 'type')
TypeError: Cannot read properties of undefined (reading 'type')
    at EntityManagerFactory.create (http://localhost:9876/_karma_webpack_/webpack:/node_modules/typeorm/browser/entity-manager/EntityManagerFactory.js:12:39)
    at DataSource.createEntityManager (http://localhost:9876/_karma_webpack_/webpack:/node_modules/typeorm/browser/data-source/DataSource.js:403:43)
    at new DataSource (http://localhost:9876/_karma_webpack_/webpack:/node_modules/typeorm/browser/data-source/DataSource.js:54:29)
    at Module.7752 (http://localhost:9876/_karma_webpack_/webpack:/src/app/control/app.datasource.service.ts:11:30)
    at __webpack_require__ (http://localhost:9876/_karma_webpack_/webpack:/webpack/bootstrap:19:1)
    at Module.4004 (http://localhost:9876/_karma_webpack_/main.js:90:81)
    at __webpack_require__ (http://localhost:9876/_karma_webpack_/webpack:/webpack/bootstrap:19:1)
    at __webpack_exec__ (http://localhost:9876/_karma_webpack_/main.js:198:48)
    at http://localhost:9876/_karma_webpack_/main.js:199:126
    at Function.__webpack_require__.O (http://localhost:9876/_karma_webpack_/webpack:/webpack/runtime/chunk loaded:23:1)

环境信息 #

• IDE：Jetbrains WebStorm（Windows 10）
• 处理器：AMD FX(tm)-8300 Eight-Core Processor 3.30 GHz
• 相关配置文件（package.json、tsconfig.json、angular.json）见原文

疑问 #

哪里操作有误？如何让TypeORM在标准Angular浏览器环境中正常工作？

内容的提问来源于stack exchange，提问作者hww