angularjs - Angular 混合错误 : Trying to get the AngularJS injector before it being set

Question

如何在 Angular 5 组件中使用 AngularJS 服务？

我有 AngularJS 应用程序，我正在尝试制作混合应用程序但无法使用 AngularJS 服务洞察 Angular 组件:出现错误

ERROR Error: Trying to get the AngularJS injector before it being set.

我的 main.ts 是

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';
platformBrowserDynamic().bootstrapModule(AppModule);

应用模块:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule, InjectionToken } from '@angular/core';
import { FormsModule } from '@angular/forms';

import { UpgradeModule, downgradeComponent } from '@angular/upgrade/static';
import { AppComponent } from './app.component';
import { SignInComponent } from "./modules/login/components/sign-in/sign-in.component";
import { authServiceProvider } from './shared/angularJS-upgraded-providers';



@NgModule({
    declarations: [
        AppComponent,
        SignInComponent
    ],
    imports: [
        BrowserModule,
        UpgradeModule,
        FormsModule
    ],
    entryComponents: [
        SignInComponent
    ],
    providers: [authServiceProvider],
    bootstrap: [SignInComponent]
})

export class AppModule {
    ngDoBootstrap() {}
}

angularJS-upgraded-providers.ts :

import { InjectionToken } from "@angular/core";
export const AuthService = new InjectionToken<any>('authService');

export function authServiceFactory(i: any) {
  return i.get('authService');
}

export const authServiceProvider = {
  provide: AuthService,
  useFactory: authServiceFactory,
  deps: ['$injector']
};

和 sign-in.component.ts :

import { Component, Inject } from '@angular/core';
import {AuthService} from "../../../../shared/angularJS-upgraded-providers";

@Component({
    selector: 'sign-in',
    template: require('./sign-in.component.html')
})

export class SignInComponent {
    constructor(
        @Inject(AuthService) private authService: any) {
    }
}

当我删除 SignInComponent 构造函数时，部分代码编译良好，但使用 @Inject(AuthService) private authService: any) { } 部分时出现错误:

Trying to get the AngularJS injector before it being set.

请给我一些建议，我可以如何实现 angularJS 服务洞察 Angular 组件。 谢谢

附言我的 package.json :

{
  "name": "test",
  "version": "1.0.0",
  "private": true,
  "scripts": {
    "start": "webpack-dev-server --port=4200 --open chrome"
  },
  "dependencies": {
    "@angular/common": "^5.2.11",
    "@angular/compiler": "^5.2.11",
    "@angular/core": "^5.2.11",
    "@angular/forms": "^5.2.11",
    "@angular/http": "^5.2.11",
    "@angular/platform-browser": "^5.2.11",
    "@angular/platform-browser-dynamic": "^5.2.11",
    "@angular/router": "^5.2.11",
    "@angular/upgrade": "^5.2.11",
    "core-js": "^2.5.7",
    "reflect-metadata": "^0.1.12",
    "rxjs": "^5.5.11",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@types/jquery": "^3.3.6",
    "@types/node": "^8.10.23",
    "awesome-typescript-loader": "^5.2.0",
    "css-loader": "^1.0.0",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "raw-loader": "^0.5.1",
    "style-loader": "^0.22.1",
    "ts-loader": "3.2.0",
    "typescript": "^2.9.2",
    "webpack": "^4.16.5",
    "webpack-cli": "^3.1.0",
    "webpack-dev-server": "^3.1.5"
  }
}

AngularJS 版本:1.6.8

Answer 1

这意味着您在组件树的某处引入了 AngularJS 依赖项。它可能位于您的直接组件中，也可能位于线下的某些依赖项中。

调试:

方法一

在 bootstrap 调用之前添加一个 debugger 语句:

it('should render the component', () => {
   debugger;
   bootstrap(Ng2AppComponent);
   ...
 });

1. 打开 JS 控制台，让测试在调试器位置运行和暂停。
2. 单击“停止/暂停”图标(位于“来源”选项卡的边栏中)并勾选“出现异常时暂停”。取消暂停调试器。
3. 调试器应该在调用 injectorFactory 时停止。使用堆栈资源管理器查找对 resolveNgModuleDep 的调用。这些将是递归的，因此堆栈的顶部将更接近叶节点，而堆栈下方的调用将更接近被测试的组件。查找类似以下行:tokenKey = "ServiceName"。这可能是您的违规服务。
4. 再深入堆栈一层，找出哪个组件试图注入(inject)该服务。
5. 在您的测试中，模拟一个提供程序来处理该特定注入(inject)。请注意，此代码假定只有一个问题注入(inject)。对于多个注入(inject)器问题，您需要对这些进行特殊处理:

 beforeEach(() => {
   setupModule({
     imports: [
       ...
     ],
     providers: [
       {
         provide: '$injector',
         useValue: {
           get: () => {
             return new MockService();  // enhance as needed
           },
         }
       }
     ],
   });

方法二

1. 为 $injector 调用模拟一个提供者，并返回一个空对象。

beforeEach(() => {
   setupModule({
     imports: [
       ...
     ],
     providers: [
       {
         provide: '$injector',
         useValue: {
           get: (serviceName?: string) => {
            console.log('looking for serviceName:', serviceName);
            return {};  // this will break things differently
           },
         }
       }
     ],
   });

1. 查看您的控制台输出以找到有问题的服务/签名。这可能会或可能不会比方法 1 涉及更少的工作。