Bring webpack tasks to npm scripts and wrap it with rakes

example/Procfile

@@ -1,4 +1,4 @@
 # Run Rails & Webpack concurrently
 # Example file from webpack-rails gem
 rails: bundle exec rails server
-webpack: ./node_modules/.bin/webpack-dev-server --config config/webpack.config.js
+webpack: npm run serve

example/package.json

@@ -2,6 +2,10 @@
   "name": "webpack-rails-example",
   "version": "0.0.1",
   "license": "MIT",
+  "scripts": {
+    "compile":  "webpack -d --config config/webpack.config.js",
+    "serve": "webpack-dev-server -p --config config/webpack.config.js"
+  },
   "dependencies": {
     "stats-webpack-plugin": "^0.2.1",
     "webpack": "^1.9.11",

lib/tasks/webpack.rake

@@ -1,19 +1,10 @@
 namespace :webpack do
   desc "Compile webpack bundles"
-  task compile: :environment do
-    ENV["TARGET"] = 'production' # TODO: Deprecated, use NODE_ENV instead
+  task(:compile) do
     ENV["NODE_ENV"] = 'production'
-    webpack_bin = ::Rails.root.join(::Rails.configuration.webpack.binary)
-    config_file = ::Rails.root.join(::Rails.configuration.webpack.config_file)
-
-    unless File.exist?(webpack_bin)
-      raise "Can't find our webpack executable at #{webpack_bin} - have you run `npm install`?"
-    end
-
-    unless File.exist?(config_file)
-      raise "Can't find our webpack config file at #{config_file}"
-    end
-
-    sh "#{webpack_bin} --config #{config_file} --bail"
+    sh "npm run compile"
   end
+
+  desc "Start webpack dev server"
+  task(:serve) { sh "npm run serve" }
 end