title: Is it possible to reference a property in package.json
body: <p>Consider the following package.json:</p>
  
  <pre><code>{
    "name": "expressapp",
    "version": "1.0.0",
    "description": "",
    "main": "app.js",
    "scripts": {        
      "dev": "./node_modules/.bin/nodemon app.js"
    },
    "author": "me",
    "license": "ISC",
    "dependencies": {
      "express": "^4.13.4",
      "mongodb": "^2.1.7"
    },
    "devDependencies": {
      "nodemon": "^1.9.1"
    }
  }
  </code></pre>
  
  <p>Now I want to rename my <code>app.js</code> to <code>index.js</code>. So I have to edit that name at least in two different places: main property and dev property of scripts. Is it possible to reference the value of <code>main</code> property inside package.json?</p>