feat(style): automatically add dependencies if style is set on new projects

Fixes #986

Author: Brocco

addon/ng2/blueprints/ng2/files/package.json

@@ -47,6 +47,6 @@
     "ts-node": "^0.5.5",
     "tslint": "^3.6.0",
     "typescript": "^1.8.10",
-    "typings": "^0.8.1"
+    "typings": "^0.8.1"<%= stylePackage %>
   }
 }

addon/ng2/blueprints/ng2/index.js

@@ -2,6 +2,7 @@ const Blueprint   = require('ember-cli/lib/models/blueprint');
 const path        = require('path');
 const stringUtils = require('ember-cli-string-utils');
 const getFiles = Blueprint.prototype.files;
+const EOL = require('os').EOL;
 
 module.exports = {
   description: '',
@@ -28,6 +29,17 @@ module.exports = {
     const fullAppName = stringUtils.dasherize(options.entity.name)
       .replace(/-(.)/g, (_, l) => ' ' + l.toUpperCase())
       .replace(/^./, (l) => l.toUpperCase());
+    
+    var stylePackage = '';
+    switch(options.style.toLowerCase()) {
+    case 'sass':
+    case 'scss':
+      stylePackage = `,${EOL}    "node-sass": "3.7.0"`;
+      break;
+    case 'styl':
+      stylePackage = `,${EOL}    "stylus": "0.54.5"`;
+      break; 
+    }
 
     return {
       htmlComponentName: stringUtils.dasherize(options.entity.name),
@@ -38,7 +50,8 @@ module.exports = {
       prefix: options.prefix,
       styleExt: this.styleExt,
       refToTypings: refToTypings,
-      isMobile: options.mobile
+      isMobile: options.mobile,
+      stylePackage: stylePackage
     };
   },