fix(@angular/cli): revert following @clydin comments

Author: douglasduteil

packages/@angular/cli/models/webpack-configs/common.ts

@@ -23,8 +23,7 @@ export function getCommonConfig(wco: WebpackConfigOptions) {
   const { projectRoot, buildOptions, appConfig } = wco;
 
   const appRoot = path.resolve(projectRoot, appConfig.root);
-  const projectRootNodeModules = path.resolve(projectRoot, 'node_modules');
-  const nodeModules = module.paths.slice(0, module.paths.indexOf(projectRootNodeModules) + 1);
+  const nodeModules = path.resolve(projectRoot, 'node_modules');
 
   let extraPlugins: any[] = [];
   let extraRules: any[] = [];
@@ -68,12 +67,12 @@ export function getCommonConfig(wco: WebpackConfigOptions) {
     devtool: buildOptions.sourcemaps ? 'source-map' : false,
     resolve: {
       extensions: ['.ts', '.js'],
-      modules: [appRoot, 'node_modules', projectRootNodeModules],
+      modules: [nodeModules, 'node_modules']
     },
     resolveLoader: {
       modules: nodeModules
     },
-    context: projectRoot,
+    context: __dirname,
     entry: entryPoints,
     output: {
       path: path.resolve(projectRoot, buildOptions.outputPath),
@@ -83,7 +82,7 @@ export function getCommonConfig(wco: WebpackConfigOptions) {
     },
     module: {
       rules: [
-        { enforce: 'pre', test: /\.js$/, loader: 'source-map-loader', exclude: nodeModules },
+        { enforce: 'pre', test: /\.js$/, loader: 'source-map-loader', exclude: [nodeModules] },
         { test: /\.json$/, loader: 'json-loader' },
         { test: /\.html$/, loader: 'raw-loader' },
         { test: /\.(eot|svg)$/, loader: `file-loader?name=[name]${hashFormat.file}.[ext]` },