未捕获错误:模块"AppModule"导入的意外值"AngularFireDatabase".请添加@NgModule注释

Question

嗨,我是角度和firebase的新手,我从今天早上起就一直在努力解决一个简单的代码问题,我搜索了这个问题,但我找不到任何对我有用的解决方案(有时候我甚至都不懂它,我是一个真正的初学者)我在控制台上的错误如下:

未捕获错误:模块"AppModule"导入的意外值"AngularFireDatabase".请添加@NgModule注释.在位于eval(compiler.js:15225)的syntaxError(compiler.js:485)处,位于JitCompiler._compileModuleAndComponents的JitCompiler._loadModules(compiler.js:34255)的CompileMetadataResolver.getNgModuleMetadata(compiler.js:15200)的Array.forEach()处(compiler.js:34216)位于Eval(main.ts)的PlatformRef.bootstrapModule(core.js:5568)的CompilerImpl.compileModuleAsync(platform-b​​rowser-dynamic.js:230)上的JitCompiler.compileModuleAsync(compiler.js:34110) :11)

这是我的代码: app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AngularFireModule } from "angularfire2";
import { AngularFireDatabaseModule, AngularFireDatabase } from "angularfire2/database";
import { AppComponent } from './app.component';
import { environment } from '../environments/environment';


@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AngularFireModule.initializeApp(environment.firebase),
    AngularFireDatabase    
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

app.component.ts

import { Component } from '@angular/core';

import { Observable } from 'rxjs/Observable';
import { AngularFireDatabase } from "angularfire2/database";

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {

   }
}

package.json的依赖项

  "dependencies": {
    "@angular/animations": "^5.0.0",
    "@angular/common": "^5.0.0",
    "@angular/compiler": "^5.0.0",
    "@angular/core": "^5.0.0",
    "@angular/forms": "^5.0.0",
    "@angular/http": "^5.0.0",
    "@angular/platform-browser": "^5.0.0",
    "@angular/platform-browser-dynamic": "^5.0.0",
    "@angular/platform-server": "^5.1.2",
    "@angular/router": "^5.0.0",
    "@angular/service-worker": "^5.1.2",
    "angularfire2": "^5.0.0-rc.4",
    "core-js": "^2.4.1",
    "firebase": "4.8.0",
    "ng-push": "^0.2.1",
    "ng-pwa-tools": "0.0.15",
    "rxjs": "^5.5.2",
    "webpack": "^3.10.0",
    "zone.js": "^0.8.14"
  },
  "devDependencies": {
    "@angular/cli": "^1.6.2",
    "@angular/compiler-cli": "^5.0.0",
    "@angular/language-service": "^5.0.0",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "^4.0.1",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.2.0",
    "tslint": "~5.7.0",
    "typescript": "~2.4.2"
  }

我试图重新安装所有的东西,但似乎没有任何工作,我希望你们可以帮助我

Answer 1

我觉得冯需要改变你的进口替代AngularFireDatabase与AngularFireDatabaseModule:

  imports: [
    ...
    AngularFireDatabaseModule 
  ],

并AngularFireDatabase从您的模块导入中删除:

import { AngularFireDatabaseModule } from "angularfire2/database";

您正在导入AngularFireDatabase而不是模块.AngularFireDatabase应仅在组件中导入.