Angular生产环境构建出现RXJS "ERROR TypeError: Object(...) is not a function"问题求助

我已经在StackOverflow和其他网站找了各种解决方案，但尝试后都没效果，只好来这里求助了。

情况是这样的：当我执行普通构建命令ng b时，应用完全正常运行；但使用ng b --prod --aot=true命令构建并运行后，控制台抛出了以下异常：

ERROR TypeError: Object(...) is not a function
at CG.getAPIURLs (main.f5019b5d20f499feb949.js:1)
at new Ou (main.f5019b5d20f499feb949.js:1)
at Sn (main.f5019b5d20f499feb949.js:1)
at xn (main.f5019b5d20f499feb949.js:1)
at Cr (main.f5019b5d20f499feb949.js:1)
at br (main.f5019b5d20f499feb949.js:1)
at Object.Rr [as createRootView] (main.f5019b5d20f499feb949.js:1)
at Kl.create (main.f5019b5d20f499feb949.js:1)
at gt.create (main.f5019b5d20f499feb949.js:1)
at Di.bootstrap (main.f5019b5d20f499feb949.js:1)
ee @ main.f5019b5d20f499feb949.js:1

我当前使用的Angular版本信息如下：

Angular CLI: 9.1.7
Node: 16.10.0
OS: win32 x64

Angular: 9.1.9
... animations, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router

Ivy Workspace: No

Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.901.7
@angular-devkit/build-angular 0.901.7
@angular-devkit/build-optimizer 0.901.7
@angular-devkit/build-webpack 0.901.7
@angular-devkit/core 9.1.7
@angular-devkit/schematics 9.1.7
@angular/cli 9.1.7
@angular/http 7.2.16
@ngtools/webpack 9.1.7
@schematics/angular 9.1.7
@schematics/update 0.901.7
rxjs 6.5.5
typescript 3.7.5
webpack 4.42.0

相关的服务代码如下：

import { APIURLType } from './types/apiurl.type';
import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from '../../../node_modules/rxjs/Observable';
import { of } from '../../../node_modules/rxjs/Observable/of';
import { environment } from './../../environments/environment';

@Injectable()
export class APIPathService {
    public aPIPathURLs: APIURLType;
    public kind = 'nothing';
    public environmentAPI: APIURLType = environment;

    constructor(public httpClient: HttpClient) {
        console.log('APIPathURL.service.ts');
    } // ends constructor

    getAPIURLs(): Observable<APIURLType> {
        console.log('Environment API: ' + this.environmentAPI.rootPath);
        return of(this.environmentAPI);
    } // ends getAPIURLs
} // ends class APIPathService

现在我完全没头绪，不知道是不是应该直接升级所有依赖项，希望能得到一些解决问题的线索，非常感谢！

TTFN
Tim

内容的提问来源于stack exchange，提问作者Timothy Shenton