fix: Angular2 dependency warning (PatrickJS#998)

* fix: Angular2 RC7 dependency warning

* ~ minor syntactic change

LGTM

* Update webpack.common.js

config/webpack.common.js

@@ -14,6 +14,7 @@ const HtmlWebpackPlugin = require('html-webpack-plugin');
 const ForkCheckerPlugin = require('awesome-typescript-loader').ForkCheckerPlugin;
 const HtmlElementsPlugin = require('./html-elements-plugin');
 const AssetsPlugin = require('assets-webpack-plugin');
+const ContextReplacementPlugin = require('webpack/lib/ContextReplacementPlugin'); 
 
 /*
  * Webpack Constants
@@ -222,6 +223,19 @@ module.exports = function(options) {
         name: ['polyfills', 'vendor'].reverse()
       }),
 
+      /**
+       * Plugin: ContextReplacementPlugin
+       * Description: Provides context to Angular's use of System.import
+       * 
+       * See: https://webpack.github.io/docs/list-of-plugins.html#contextreplacementplugin
+       * See: https://github.com/angular/angular/issues/11580
+       */
+      new ContextReplacementPlugin(
+        // The (\\|\/) piece accounts for path separators in *nix and Windows
+        /angular(\\|\/)core(\\|\/)(esm(\\|\/)src|src)(\\|\/)linker/,
+        helpers.root('src') // location of your src
+      ),
+
       /*
        * Plugin: CopyWebpackPlugin
        * Description: Copy files and directories in webpack.