Angularfire2 在 Angular2 中导致 SystemJS 错误
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【中文标题】Angularfire2 在 Angular2 中导致 SystemJS 错误【英文标题】：Angularfire2 causing SystemJS errors in Angular2 【发布时间】：2018-02-02 23:27:05 【问题描述】：我正在尝试将我的 Firebase 数据库连接到我过去做过几次的 Angular 2 应用程序，没有任何问题。由于某种原因，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运行，然后我遇到了这个 https://github.com/angular/angularfire2/pull/1041
他们提供的修复程序为angularfire 部分提供了扩展名all.umd.js，而我的angularfire 文件夹中的文件只有umd.js 版本，所以我进行了修改以适应我拥有的文件，现在我卡在当前的错误中。
这是我的文件的样子
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);
);
我在查看 system.config.js 文件时注意到其中 Angularfire2 被合并所有这些文件都指向 bundles 文件夹中的同一个文件。我注意到Firebase 也是如此。我尝试将其直接更改为auth、database 等文件，但出现更多错误。
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，所以我不知道这是否会导致问题，因为我必须重新找到并重新安装适用于我的计算机的最新版本的Angular2 .当我第一次开始使用 Firebase 时，我并没有遇到这么多麻烦，所以奇怪的是我无法弄清楚这一点。非常感谢所有帮助。
【问题讨论】：
见***.com/questions/43772474/…, ***.com/questions/43990887/… 【参考方案1】：您使用的是 AngularFire2 版本 4.0.0-rc.1。对 4.0.0-rc.2 进行了大规模的封装重写，为 SystemJS 解决了这个问题。
在以前的版本中，解析 angularfire2/database 和 angularfire2/auth 是通过深度导入完成的。如果您使用的是 webpack，这很好。但是，SystemJS 用户需要 UMD 包。我们不只是将每个模块都塞进一个巨型 UMD 包中，而是更改了包装，为定义 UMD 包的每个模块声明了一个 package.json。
【讨论】：
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