Angular 5, global entity (service)

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <script type="text/javascript" charset="utf-8">
      window.AngularVersionForThisPlunker = 'latest'
    </script>
    <title>angular playground</title>
    <link rel="stylesheet" href="style.css" />
    <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>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <h3>Angular, Global entity (Service)</h3>
    Based on StackOverflow thread:
    <a href="https://stackoverflow.com/a/43991457/3211932">https://stackoverflow.com/a/43991457/3211932</a>
    <br />
    <br />
    <my-app>
      loading...
    </my-app>
  </body>

</html>

/* Styles go here */

### Angular / Typescript, Globals

(c) dhilt, [github](https://github.com/dhilt), [stackoverflow](https://stackoverflow.com/users/3211932/dhilt)

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',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//our root app component
import {Component, NgModule, VERSION} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {FormsModule} from '@angular/forms'

import {Globals} from './globals'

import {Component1} from './component1'
import {Component2} from './component2'
import {Component3} from './component3'

@Component({
  selector: 'my-app',
  template: `
    <div>
      <i>Powered by  {{title}}</i>
      <br />
      <br />
      <hr />
      <component1></component1>
      <br />
      <hr />
      <component2></component2>
      <br />
      <hr />
      <component3></component3>
      <br />
      <hr />
    </div>
  `
})
export class App {
  title: string;
  
  constructor() {
    this.title = `Angular v${VERSION.full}`;
  }
}

@NgModule({
  imports: [ BrowserModule, FormsModule ],
  declarations: [ App, Component1, Component2, Component3 ],
  bootstrap: [ App ],
  providers: [ Globals ]
})
export class AppModule {}

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

platformBrowserDynamic().bootstrapModule(AppModule)

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

@Injectable()
export class Globals {
  role: string = 'test';
  
}

import {Component} from '@angular/core'

import {Globals} from './globals'

@Component({
  selector: 'component1',
  template: `
    <div>
      Component 1
      <br/>
      <br />
      global role: <b>{{globals.role}}</b>
    </div>
  `
})
export class Component1 {
  constructor(private globals: Globals) {
  }
}

import {Component} from '@angular/core'

import {Globals} from './globals'

@Component({
  selector: 'component2',
  template: `
    <div>
      Component 2
      <br />
      <br />
      <input [(ngModel)]="role" />
      <button (click)="changedRole()">aplly</button>
    </div>
  `
})
export class Component2 {
  private role: string;
  
  constructor(private globals: Globals) {
    this.role = globals.role;
  }
  
  private changedRole() {
    this.globals.role = this.role;
  }
}

import {Component} from '@angular/core'

import {Globals} from './globals'

@Component({
  selector: 'component3',
  template: `
    <div>
      Component 3
      <br/>
      <br />
      Global role value
      <b>{{globals.role === 'test' ? 'is' : 'is not'}}</b>
      "test"
    </div>
  `
})
export class Component3 {
  constructor(private globals: Globals) {
  }
}