Angular 角形电缆E&；使用工厂开关

我正在尝试为Angular 4提供程序工厂设计一种模式，以便在运行

ng e2e

时切换使用的实现

我已经研究过如何在angular cli中进行一些操作，但是遇到了

ng serve-e e2e

$ ng serve -e e2e
Cannot read property 'length' of undefined
TypeError: Cannot read property 'length' of undefined
    at createSourceFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:15457:109)
    at parseSourceFileWorker (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:15389:26)
    at Object.parseSourceFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:15338:26)
    at Object.createSourceFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:15192:29)
    at VirtualFileStats.getSourceFile (/home/user/Documents/workspace/ngproj/node_modules/@ngtools/webpack/src/compiler_host.js:66:35)
    at WebpackCompilerHost.getSourceFile (/home/user/Documents/workspace/ngproj/node_modules/@ngtools/webpack/src/compiler_host.js:213:38)
    at findSourceFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:67909:29)
    at processImportedModules (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:68056:25)
    at findSourceFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:67937:17)
    at processImportedModules (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:68056:25)
    at findSourceFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:67937:17)
    at processImportedModules (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:68056:25)
    at findSourceFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:67937:17)
    at processSourceFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:67840:27)
    at processRootFile (/home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:67728:13)
    at /home/user/Documents/workspace/ngproj/node_modules/typescript/lib/typescript.js:67018:60

const authFactory = (http) => {
  if (environment.useRestApi) {
    console.log('Using HTTP REST Api')
    return new HttpAuthService(http);
  } else {
    console.log('Using In Memory REST Api')
    return new InMemoryAuthService();
  }
};

@NgModule({
  imports: [
    CommonModule,
    HttpModule
  ],
  declarations: [],
  providers: [
    {
      provide: AuthService,
      useFactory: authFactory,
      deps: [Http]
    }
  ]
})
export class AuthModule {
}

忽略这一特定问题，是否有人有基于cli参数或特定环境（例如通过

ng e2e

检测应用程序正在运行）的提供商工厂和切换实现的良好模式

我对使用

MockBackend

/

MockConnection

不感兴趣（我在.spec.ts文件中使用了它们来测试

HttpAuthService

）

堆栈跟踪更新 堆栈跟踪是由my.angular-cli.json文件中的键入错误引起的：

  "environments": {
    "dev": "environments/environment.ts",
    "prod": "environments/environment.prod.ts",
    "e2e": "environments/environments.e2e.ts"
  }

这里引用的e2e文件在文件名中有一个额外的“s”。与往常一样，ng cli/webpack/ts/node以一种明显的方式告诉我这一点，这确实是件好事

我仍然对其他选择持开放态度，所以我将把这作为一个更新而不是一个答案（希望那些尚未回答的问题可能会引起更多的兴趣），但同时，使用一个环境对我来说是可行的