anchor.diff:    They do not have to be deployed with the production application although there is rarely harm in doing so.
   
     ***[concurrently](https://www.npmjs.com/package/concurrently)*** - 
  -  a utility to run multiple *npm* commands concurrently on OS/X, Windows, and Linux operating systems.
  +  A utility to run multiple *npm* commands concurrently on OS/X, Windows, and Linux operating systems.
     
     ***[lite-server](https://www.npmjs.com/package/lite-server)*** - 
  -  a light-weight, static file server, written and maintained by [John Papa](http://johnpapa.net/) 
  +  A light-weight, static file server, written and maintained by [John Papa](http://johnpapa.net/) 
     with excellent support for Angular apps that use routing.
     
     ***[typescript](https://www.npmjs.com/package/typescript)*** - 
  -  the TypeScript language server including the *tsc* TypeScript compiler.
  -  
  -  ***[typings](https://www.npmjs.com/package/typings)*** - a manager for TypeScript definition files.
  +  The TypeScript language server including the *tsc* TypeScript compiler.
  +  
  +  ***[typings](https://www.npmjs.com/package/typings)*** - A manager for TypeScript definition files.
     Learn more about it in the [TypeScript Configuration](typescript-configuration.html#typings) chapter.
     
     This section likely grows as we add more tools, testing, and build support. 
  
positive.code:     Node.js and npm are essential to Angular 2 development. 
      
      <a href="https://docs.npmjs.com/getting-started/installing-node" target="_blank" title="Installing Node.js and updating npm">
      Get it now</a> if it's not already installed on your machine
   
      **Verify that you are running at least node `v4.x.x` and npm `3.x.x`**
      by running `node -v` and `npm -v` in a terminal/console window.
  
negative.code:   Good for demos, documentation samples, and early stage development (before we even have a server).
    Learn about it in the [Http Client](server-communication.html#appendix-tour-of-heroes-in-memory-server) chapter.
    
    ***bootstrap*** - [Bootstrap](http://getbootstrap.com/) is a popular HTML and CSS framework for designing responsive web apps.
    Some of the documentation samples improve their appearance with *bootstrap*.
    
  a(id="dev-dependencies")
  