PERF: Speed up JSHint tests by using local buffers instead of AJAX

requests.

lib/es6_module_transpiler/tilt/es6_module_transpiler_template.rb

@@ -65,6 +65,8 @@ module Tilt
         @output = klass.v8.eval(generate_source(scope))
       end
 
+      source = @output.dup
+
       # For backwards compatibility with plugins, for now export the Global format too.
       # We should eventually have an upgrade system for plugins to use ES6 or some other
       # resolve based API.
@@ -81,6 +83,12 @@ module Tilt
         @output << "\n\nDiscourse.#{class_name}#{type.classify} = require('#{require_name}').default"
       end
 
+      # Include JS code for JSHint
+      unless Rails.env.production?
+        req_path = "/assets/#{scope.logical_path}.js"
+        @output << "\nwindow.__jshintSrc = window.__jshintSrc || {}; window.__jshintSrc['#{req_path}'] = #{source.to_json};\n"
+      end
+
       @output
     end