anchor.diff:  
   :marked
     This QuickStart guide demonstrates how to build and run a simple Angular 2 application in #{_Lang}.
  -  It establishes a common development environment used throughout the code examples in these guides.
  +  It also establishes a common development environment used throughout the code examples in these
  +  guides.
   
   .callout.is-helpful
     header Don't want #{_Lang}?
  
positive.code:       typings.json,
        systemjs.config.js
      `)
    .l-verbose-section
     p.
      Learn more about all these configuration files in the
      #[a(href="guide/npm-packages.html") Npm Package Configuration] guide, the
      #[a(href="#{_tsconfigUri}") TypeScript Configuration] guide, and in the
      #[a(href="#systemjs") SystemJS] section later in this guide.
  
  
  h3#install-packages #{_Install} packages
  block install-packages
    :marked
      Using npm from the command line, install the packages listed in `package.json`:
  
    code-example(language="sh").
      npm install
  
negative.code:   mkdir angular2!{_}quickstart
    cd    angular2!{_}quickstart
  
  h4#add-config-files Create #{_package_and_config_files}
  block package-and-config-files
    - var _tsconfigUri = 'guide/typescript-configuration.html#tsconfig'
    - var _typingsUri = 'guide/typescript-configuration.html#!#typings'
  