Angularfire2在Angular2中导致SystemJS错误

时间：2017-08-24 23:45:13

标签： angular systemjs angularfire2

我试图让我的Firebase数据库连接到我的 Angular 2 应用程序，我过去曾做过几次没有任何问题。出于某种原因，我收到此错误

Error: Can't resolve all parameters for AppService: (?).
        at Error (native)
        at syntaxError (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:1513:34)
        at CompileMetadataResolver._getDependenciesMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14790:35)
        at CompileMetadataResolver._getTypeMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14658:26)
        at CompileMetadataResolver._getInjectableMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14644:21)
        at CompileMetadataResolver.getProviderMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14933:40)
        at eval (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14863:49)
        at Array.forEach (native)
        at CompileMetadataResolver._getProvidersMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14824:19)
        at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14255:30)
    Evaluating http://localhost:3000/main.js
    Error loading http://localhost:3000/main.js
        at Error (native)
        at syntaxError (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:1513:34)
        at CompileMetadataResolver._getDependenciesMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14790:35)
        at CompileMetadataResolver._getTypeMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14658:26)
        at CompileMetadataResolver._getInjectableMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14644:21)
        at CompileMetadataResolver.getProviderMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14933:40)
        at eval (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14863:49)
        at Array.forEach (native)
        at CompileMetadataResolver._getProvidersMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14824:19)
        at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14255:30)
    Evaluating http://localhost:3000/main.js
    Error loading http://localhost:3000/main.js

起初应用程序根本无法工作，然后我遇到了这个 https://github.com/angular/angularfire2/pull/1041

他们提供的修补程序包含all.umd.js部分的扩展名angularfire，而angularfire文件夹中的文件只有umd.js个版本，因此我进行了修改以适应我拥有的文件，现在我已经陷入了当前的错误。

这是我的文件的样子

的package.json 

{
  "name": "optiq_vision_splash_page",
  "version": "1.0.0",
  "description": "QuickStart package.json from the documentation, supplemented with testing support",
  "scripts": {
    "build": "tsc -p src/",
    "build:watch": "tsc -p src/ -w",
    "build:e2e": "tsc -p e2e/",
    "serve": "lite-server -c=bs-config.json",
    "serve:e2e": "lite-server -c=bs-config.e2e.json",
    "prestart": "npm run build",
    "start": "concurrently \"npm run build:watch\" \"npm run serve\"",
    "pree2e": "npm run build:e2e",
    "e2e": "concurrently \"npm run serve:e2e\" \"npm run protractor\" --kill-others --success first",
    "preprotractor": "webdriver-manager update",
    "protractor": "protractor protractor.config.js",
    "pretest": "npm run build",
    "test": "concurrently \"npm run build:watch\" \"karma start karma.conf.js\"",
    "pretest:once": "npm run build",
    "test:once": "karma start karma.conf.js --single-run",
    "lint": "tslint ./src/**/*.ts -t verbose"
  },
  "keywords": [],
  "author": "",
  "license": "MIT",
  "dependencies": {
    "@angular/common": "~4.0.0",
    "@angular/compiler": "~4.0.0",
    "@angular/core": "~4.0.0",
    "@angular/forms": "~4.0.0",
    "@angular/http": "~4.0.0",
    "@angular/platform-browser": "~4.0.0",
    "@angular/platform-browser-dynamic": "~4.0.0",
    "@angular/router": "~4.0.0",
    "@types/node": "^6.0.87",
    "angular-in-memory-web-api": "~0.3.0",
    "angularfire2": "^4.0.0-rc.1",
    "core-js": "^2.4.1",
    "firebase": "^4.2.0",
    "rxjs": "5.0.1",
    "systemjs": "0.19.40",
     "zone.js": "^0.8.4"
   },
  "devDependencies": {
    "concurrently": "^3.2.0",
    "lite-server": "^2.2.2",
    "typescript": "~2.1.0",
    "canonical-path": "0.0.2",
    "tslint": "^3.15.1",
    "lodash": "^4.16.4",
    "jasmine-core": "~2.4.1",
    "karma": "^1.3.0",
    "karma-chrome-launcher": "^2.0.0",
    "karma-cli": "^1.0.1",
    "karma-jasmine": "^1.0.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~4.0.14",
    "rimraf": "^2.5.4",
    "@types/node": "^6.0.46",
    "@types/jasmine": "2.5.36"
  },
  "repository": {}
}

systemjs.config.js 

/**
* System configuration for Angular samples
* Adjust as necessary for your application needs.
*/
(function (global) {
  System.config({
    paths: {
      // paths serve as alias
      'npm:': 'node_modules/'
    },
    // map tells the System loader where to look for things
    map: {
      // our app is within the app folder
      'app': 'app',

      // angular bundles
      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
      '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
      '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',

      // other libraries
      'rxjs':                      'npm:rxjs',
      'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',
      'angularfire2' : 'npm:angularfire2/bundles/angularfire2.umd.js',
      'angularfire2/database' : 'npm:angularfire2/bundles/angularfire2.umd.js',
      'angularfire2/auth' : 'npm:angularfire2/bundles/angularfire2.umd.js',
      'firebase': 'npm:firebase/firebase.js',
      'firebase/app': 'npm:firebase/firebase.js',
      'firebase/database': 'npm:firebase/firebase.js',
      'firebase/auth': 'npm:firebase/firebase.js'
    },
    // packages tells the System loader how to load when no filename and/or no extension
    packages: {
      app: {
        defaultExtension: 'js',
        meta: {
          './*.js': {
            loader: 'systemjs-angular-loader.js'
          },
        firebase : {
            format: 'global',
            exports: 'firebase'
          }
        }
      },
      rxjs: {
        defaultExtension: 'js'
      }
    }
  });
})(this);

app.module 

import { NgModule }             from '@angular/core';
import { BrowserModule }        from '@angular/platform-browser';
import { ReactiveFormsModule }  from '@angular/forms';
import { HttpModule }           from '@angular/http';
import { RouterModule, Routes } from '@angular/router';
import { AngularFireModule }    from 'angularfire2';

import { AppComponent }         from './app.component';
import { AppRoutingModule }     from './app-routing.module';

import { IntroComponent }       from './intro/intro.component';
import { LogoPage }             from './logo-design/logo.component';
import { AssetPage }            from './asset-design/asset.component';
import { CollateralPage }       from './collateral-design/collateral.component';



export const firebaseConfig ={
     apiKey: "blah",
     authDomain: "blah",
     databaseURL: "blah",
     projectId: "blah",
     storageBucket: "blah",
     messagingSenderId: "blah"
};

@NgModule({
    declarations: [
      AppComponent,
      IntroComponent,
      LogoPage, AssetPage, CollateralPage
    ],

    imports:      [
      BrowserModule,
      ReactiveFormsModule,
      HttpModule,
      AppRoutingModule,
      AngularFireModule.initializeApp(firebaseConfig)
    ],

    bootstrap:    [ AppComponent ]

})

export class AppModule { }

app.service 

import { Injectable,
         Inject }                   from '@angular/core';
import { Response }                 from '@angular/http';
import { Observable }               from 'rxjs/RX';

import { Link }                     from './links-interface';

import { AngularFire,
        FirebaseListObservable,
        FirebaseObjectObservable }  from 'angularfire2';

import 'rxjs/add/operator/map';



@Injectable()

export class AppService {
    SampleData: FirebaseObjectObservable<any>;

    constructor(private af: AngularFire){}

    getData(){
        this.SampleData = this.af.database.object('intro') as FirebaseObjectObservable<any>
        return this.SampleData;
    }


}

app.component 

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

import { HttpModule }               from '@angular/http';

import { AngularFire,
        FirebaseListObservable,
        FirebaseObjectObservable }  from 'angularfire2';

import { AppService }               from './app.service';



@Component({

    moduleId: module.id,
    selector: 'my-app',
    templateUrl:'./app.component.html',
    styleUrls: ['./app.component.css'],
    providers: [ AppService ]
})



 export class AppComponent implements OnInit{

     Data: FirebaseObjectObservable<any>;

     constructor(private _data:AppService){}

     ngOnInit() {
        this._data.getData().subscribe(SampleData =>{
            this.Data = SampleData;
            console.log(this.Data);
        });
    }


 }

我注意到system.config.js文件正在合并Angularfire2，所有这些文件都会导致bundles文件夹中的同一文件。我注意到与Firebase相同。我尝试将其直接更改为auth，database等文件但出现了更多错误。

我没有升级到angular4的原因是因为我有Windows Vista并且无法更新节点。截至目前，我正在运行node 5.7和npm 3.6，因此我不知道是否可能导致问题，因为我必须找到并重新安装最多的问题在我的计算机上运行的Angular2的日期版本。当我第一次开始使用Firebase时，我没有遇到这么多麻烦，所以我很难解决这个问题。非常感谢所有帮助。

1 个答案:

答案 0 :(得分：0)

您使用的是AngularFire2版本4.0.0-rc.1。 4.0.0-rc.2进行了大量的包装重写，修复了SystemJS的这个问题。

在之前的版本中，解析angularfire2/database和angularfire2/auth是通过深度导入完成的。如果您使用webpack，这很好。但是，SystemJS用户需要UMD捆绑包。我们更改了包装，为每个定义UMD包的模块声明了package.json，而不是仅仅将每个模块填充到一个大型UMD包中。

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