Angular 6

<!DOCTYPE html>
<html>

<head>
  <base href="." />
  <script type="text/javascript" charset="utf-8">
    window.AngularVersionForThisPlunker = '6.0.0-beta.7'
  </script>
  <title>angular playground</title>
  <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
  <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
  <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
  <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
  <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
  <script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
  <script src="https://unpkg.com/gijgo@1.9.6/js/gijgo.min.js" type="text/javascript"></script>
  <link href="https://unpkg.com/gijgo@1.9.6/css/gijgo.min.css" rel="stylesheet" type="text/css" />
  <script src="config.js"></script>
  <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
</head>

<body>
  <my-app>
    loading...
  </my-app>
</body>

</html>

var angularVersion;
if(window.AngularVersionForThisPlunker === 'latest'){
  angularVersion = ''; //picks up latest
}
else {
  angularVersion = '@' + window.AngularVersionForThisPlunker;
}

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    '@angular/core': 'npm:@angular/core'+ angularVersion + '/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common' + angularVersion + '/bundles/common.umd.js',
    '@angular/common/http': 'npm:@angular/common' + angularVersion + '/bundles/common-http.umd.js',
    '@angular/compiler': 'npm:@angular/compiler' + angularVersion  + '/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http' + angularVersion + '/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router' + angularVersion +'/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms' + angularVersion + '/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations' + angularVersion + '/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations' + angularVersion + '/bundles/animations-browser.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core' + angularVersion + '/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-testing.umd.js',
    '@angular/common/http/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-http-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler' + angularVersion + '/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http' + angularVersion + '/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router' + angularVersion + '/bundles/router-testing.umd.js',
    'tslib': 'npm:tslib@1.6.1',
    'rxjs': 'npm:rxjs@5.5.10',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js',
    'gijgo-angular-wrappers': 'https://npmcdn.com/gijgo-angular-wrappers',
    'gijgo': 'npm:gijgo',
    '@types/jquery': 'npm:@types/jquery',
    '@types/gijgo': 'npm:@types/gijgo'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    },
    'gijgo-angular-wrappers': {
      main: './index.ts',
      defaultExtension: 'ts'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app.module';

platformBrowserDynamic().bootstrapModule(AppModule)
.catch(err => console.error(err));

import { Component } from '@angular/core'

@Component({
  selector: 'my-app',
  templateUrl: 'src/app.component.html'
})
export class AppComponent {

}

import { NgModule, APP_INITIALIZER } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms'; // <-- NgModel lives here
import { HttpClientModule } from '@angular/common/http';

import { AppComponent } from './app.component';
import { AppSettingsService } from './appsettings.service';
import { PermissionsService } from './permissions.service';

const appSettingsInitializerFn = (appSettings: AppSettingsService) => {
  return () => {
    return appSettings.loadAppSettings();
  };
};

const permissionsInitializerFn = (permissions: PermissionsService) => {
  return () => {
    return permissions.loadPermissions();
  };
};

@NgModule({
  imports: [ BrowserModule, FormsModule ],
  declarations: [ AppComponent ],
  bootstrap: [ AppComponent ],
  providers:[
    AppSettingsService,
    {
      provide: APP_INITIALIZER,
      useFactory: appSettingsInitializerFn,
      multi: true,
      deps: [AppSettingsService]
    },
    PermissionsService,
    {
      provide: APP_INITIALIZER,
      useFactory: permissionsInitializerFn,
      multi: true,
      deps: [PermissionsService]
    }
  ]
})
export class AppModule {}

<div>
  Angular Template
</div>

{
    "webApiUrl": "https://webapi.endpoint/"
}

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

@Injectable({
  providedIn: 'root'
})
export class AppSettingsService {

  private appSettings;

  constructor() { }

  /**
   * @method loadAppSettings
   * @description returns the application settings
   */
  loadAppSettings() {
    console.log('going to load app settings');
    setTimeout(function () {
        this.appSettings = "set";
        console.log('got appsettings');
        
    }, 3000);
  }

  /**
   * @method getWebApiUrl
   * @description returns the web API URL
   */
  getWebApiUrl() {
    return this.appSettings;
  }
}

import { Injectable } from '@angular/core';
import { AppSettingsService } from './appsettings.service';

@Injectable({
  providedIn: 'root'
})
export class PermissionsService {

  constructor(private appSettingsService: AppSettingsService) { }

  loadPermissions() {
    console.log('getting permissions');
    console.log(this.appSettingsService.getWebApiUrl()); 
  }
}