Angular 9 HttpClient-TypeError：url.indexOf不是函数

如何解决Angular 9 HttpClient-TypeError：url.indexOf不是函数

最近，我一直在转换Angular 9项目，以便在引导过程中从JSON文件而不是环境文件动态接收其配置。

进行更改后，在运行测试时出现“ TypeError：url.indexOf不是函数”错误。从错误堆栈中，问题似乎是在Angulars的HttpClient模块中发生的。我不确定为什么这会成为问题，因为我的配置更改不会修改任何根Angular模块。

此外，我不确定如何修复它。我已经搜索了Google和StackOverflow，结果通常表明这是过时的jQuery的问题-具体来说，某些功能已被弃用，不再可用。但是我不认为这是我的问题吗？同样，我的配置更改与jQuery没有任何关系，我也没有更改与jQuery相关的任何内容。

这是Stacktrace

TypeError: url.indexOf is not a function

      at new HttpRequest (../../packages/common/http/src/request.ts:221:26)
      at HttpClient.Object.<anonymous>.HttpClient.request (../../packages/common/http/src/client.ts:482:13)
      at HttpClient.Object.<anonymous>.HttpClient.get (../../packages/common/http/src/client.ts:1109:17)
      at IService.getIs (src/app/core/services/i.service.ts:49:28)
      at DialogEditComponent.initialiseDropdowns (src/app/modules/components/dialog-edit/dialog-edit.component.ts:122:46)
      at DialogEditComponent.ngOnInit (src/app/modules/components/dialog-edit/dialog-edit.component.ts:83:10)
      at checkAndUpdateDirectiveInline (../packages/core/src/view/provider.ts:217:15)
      at checkAndUpdateNodeInline (../packages/core/src/view/view.ts:440:14)
      at checkAndUpdateNode (../packages/core/src/view/view.ts:400:12)
      at debugCheckAndUpdateNode (../packages/core/src/view/services.ts:433:44)
      at debugCheckDirectivesFn (../packages/core/src/view/services.ts:394:7)
      at Object.eval [as updateDirectives] (ng:/DynamicTestModule/DialogEditComponent_Host.ngfactory.js:9:5)
      at Object.debugUpdateDirectives [as updateDirectives] (../packages/core/src/view/services.ts:388:19)
      at checkAndUpdateView (../packages/core/src/view/view.ts:370:12)
      at callWithDebugContext (../packages/core/src/view/services.ts:638:23)
      at Object.debugCheckAndUpdateView [as checkAndUpdateView] (../packages/core/src/view/services.ts:349:10)
      at ViewRef_.Object.<anonymous>.ViewRef_.detectChanges (../packages/core/src/view/refs.ts:284:16)
      at ComponentFixture.Object.<anonymous>.ComponentFixture._tick (../../packages/core/testing/src/component_fixture.ts:113:28)
      at ../../packages/core/testing/src/component_fixture.ts:127:14
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:386:30)
      at ProxyZoneSpec.Object.<anonymous>.ProxyZoneSpec.onInvoke (node_modules/zone.js/dist/proxy.js:117:43)
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:385:36)
      at Object.onInvoke (../packages/core/src/zone/ng_zone.ts:308:29)
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:385:36)
      at Zone.Object.<anonymous>.Zone.run (node_modules/zone.js/dist/zone.js:143:47)
      at NgZone.Object.<anonymous>.NgZone.run (../packages/core/src/zone/ng_zone.ts:180:50)
      at ComponentFixture.Object.<anonymous>.ComponentFixture.detectChanges (../../packages/core/testing/src/component_fixture.ts:126:19)
      at src/app/modules/components/dialog-edit/dialog-edit.component.spec.ts:62:13
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:386:30)
      at ProxyZoneSpec.Object.<anonymous>.ProxyZoneSpec.onInvoke (node_modules/zone.js/dist/proxy.js:117:43)
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:385:36)
      at Zone.Object.<anonymous>.Zone.run (node_modules/zone.js/dist/zone.js:143:47)
      at Object.<anonymous> (node_modules/jest-preset-angular/zone-patch/index.js:52:27)

这是似乎是对HttpClient模块进行调用的函数。

  public getIs(a: number,b: number,c = false) {
    let params = new HttpParams().set('a',a === 0 ? '' : a.toString());
    params = params.append('b',b === 0 ? '' : b.toString());
    return this.httpClient.get<Instance[]>(Config.settings?.url.baseApiUrl + Config.settings?.url.api.instance,{params})
      .pipe(
        map(items => {
          return c ? items.filter(item => item.isActive === true) : items;
        })
      );
  }

任何指导或建议将不胜感激！