Support spring (#221)

lib/webpacker.rb

@@ -1,4 +1,9 @@
 module Webpacker
+  def self.bootstrap
+    Webpacker::Env.load
+    Webpacker::Configuration.load
+    Webpacker::Manifest.load
+  end
 end
 
 require "webpacker/railtie" if defined?(Rails)

lib/webpacker/railtie.rb

@@ -1,19 +1,14 @@
 require "rails/railtie"
 
 require "webpacker/helper"
-require "webpacker/env"
 
 class Webpacker::Engine < ::Rails::Engine
   initializer :webpacker do |app|
     ActiveSupport.on_load :action_controller do
       ActionController::Base.helper Webpacker::Helper
     end
 
-    # Determine NODE_ENV environment based on config/webpack/paths.yml
-    Webpacker::Env.load
-    # Loads webpacker config data from config/webpack/paths.yml
-    Webpacker::Configuration.load
-    # Loads manifest data from public/packs/manifest.json
-    Webpacker::Manifest.load
+    Webpacker.bootstrap
+    Spring.after_fork {  Webpacker.bootstrap } if defined?(Spring)
   end
 end