text: 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'
      }
    }
  });