Question

在迷你之前，请注意，没有其他问题报告对我有帮助。查看有关此问题的整个stackoverflow。

这是app.module.ts：

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { LalaComponent } from './lala/lala.component';
import { FormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
import { ApiModule } from 'atlas-client';

@NgModule({
  declarations: [
    AppComponent,
    LalaComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpClientModule,
    ApiModule
  ],
  providers: [],
  bootstrap: [AppComponent],
})
export class AppModule { }

这是lala.component.ts：

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-lala',
  templateUrl: './lala.component.html',
  styleUrls: ['./lala.component.css']
})
export class LalaComponent implements OnInit {

  constructor(private http: HttpClient) {
    console.log('test');
  }

  ngOnInit() {

  }
}

package.json：

{
  "name": "lala-app",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^6.0.3",
    "@angular/common": "^6.0.3",
    "@angular/compiler": "^6.0.3",
    "@angular/core": "^6.0.3",
    "@angular/forms": "^6.0.3",
    "@angular/http": "^6.0.3",
    "@angular/platform-browser": "^6.0.3",
    "@angular/platform-browser-dynamic": "^6.0.3",
    "@angular/router": "^6.0.3",
    "core-js": "^2.5.4",
    "rxjs": "^6.0.0",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@angular/compiler-cli": "^6.0.3",
    "@angular-devkit/build-angular": "~0.6.6",
    "typescript": "~2.7.2",
    "@angular/cli": "~6.0.7",
    "@angular/language-service": "^6.0.3",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.0",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1"
  }
}

我收到此错误：

错误：您需要在AppModule中导入HttpClientModule！看到还https://github.com/angular/angular/issues/20575
at new ApiModule (atlas-client.js:216)
at _createClass (core.js:9264)
at _createProviderInstance$1 (core.js:9234)
at initNgModule (core.js:9170)
at new NgModuleRef_ (core.js:9899)
at createNgModuleRef (core.js:9888)
at Object.debugCreateNgModuleRef [as createNgModuleRef] (core.js:11719)
at NgModuleFactory_.push../node_modules/@angular/core/fesm5/core.js.NgModuleFactory_.create
（core.js：12421） at core.js：4720 在ZoneDelegate.push ../ node_modules / zone.js / dist / zone.js.ZoneDelegate.invoke （zone.js：388）

请注意，当我删除相应导入的import { HttpClientModule } from '@angular/common/http';行时，问题仍然存在。

Answer 1

当使用npm link链接swagger-codegen软件包或使用npm install PATH_TO_GENERATED_PACKAGE/dist --save（请参阅：https://github.com/angular/angular-cli/issues/8284）直接安装swagger-codegen软件包时，angular-cli中存在一个错误。

问题似乎仅与ng serve有关，而不与ng build --prod --base-href=...有关，但我尚未测试'ng build'。

“ 您需要在AppModule中导入HttpClientModule！”消息无效，但是无论如何都会引发错误。

此票证中描述的一种（丑陋的）解决方法是使用swagger-codegen-cli（或openapi-generator-cli）生成代码，搜索并注释掉错误消息：

// if (!http) {
//     throw new Error('You need to import the HttpClientModule in your AppModule! \n' +
//     'See also https://github.com/angular/angular/issues/20575');
// }

下一步：运行npm install && npm run build并将软件包安装在使用项目中。

更清洁的解决方案是使用（私有）npm注册表。

更新14/7/2018

进一步的调查显示，上述workaround不能解决所有问题。相反，我现在使用的是专用npm注册表Verdaccio，并且没有任何问题。

-Arjen

Angular 6：您需要在AppModule中导入HttpClientModule

1 个答案: